Theoretical Research Progress in High-Velocity/Hypervelocity Impact on Semi-Infinite Targets

Sun, Yunhou; Shi, Cuncheng; Liu, Zheng; Wen, Desheng

doi:https://doi.org/10.1155/2015/265321

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Review Article | Open Access

Volume 2015 | Article ID 265321 | https://doi.org/10.1155/2015/265321

Theoretical Research Progress in High-Velocity/Hypervelocity Impact on Semi-Infinite Targets

Yunhou Sun,^1,2Cuncheng Shi,^1,3Zheng Liu,¹and Desheng Wen¹

Academic Editor: Mohammad Elahinia

Received03 Nov 2014

Revised02 Feb 2015

Accepted05 Feb 2015

Published09 Mar 2015

Abstract

With the hypervelocity kinetic weapon and hypersonic cruise missiles research projects being carried out, the damage mechanism for high-velocity/hypervelocity projectile impact on semi-infinite targets has become the research keystone in impact dynamics. Theoretical research progress in high-velocity/hypervelocity impact on semi-infinite targets was reviewed in this paper. The evaluation methods for critical velocity of high-velocity and hypervelocity impact were summarized. The crater shape, crater scaling laws and empirical formulae, and simplified analysis models of crater parameters for spherical projectiles impact on semi-infinite targets were reviewed, so were the long rod penetration state differentiation, penetration depth calculation models for the semifluid, and deformed long rod projectiles. Finally, some research proposals were given for further study.

1. Introduction

In the 1950s, under the motivation of aerospace exploration and weapon design, high-velocity/hypervelocity impact phenomena gradually became a hot topic. Kinslow (1970) wrote a book entitled High Velocity Impact Phenomena [1] which systematically summarized the research progress of this topic. After the USA Landing Moon Plan being successfully carried out and the Missile Shield Plans termination, the research entered into a declinable period. It was not until the Strategic Defense Initiative (SDI) was presented in 1983 that the research received attention again. Herrmann and Wilbeck (1987) [2] reviewed the hypervelocity penetration theories. Zhang and Huang [3] wrote a book entitled Hypervelocity Impact Dynamics Introduction in which the phases transition, equation of state, penetration in different conditions, and hypervelocity emission technology were systematically introduced. In recent years, with the progress of hypervelocity weapon research, the damage mechanism has received more and more attention [4]. This paper will summarize the research progress in high-velocity/hypervelocity impact on semi-infinite targets, including the impact velocity regions, spherical projectile crater effect on semi-infinite targets, and long rod projectile penetration theories, and give some proposals for future research.

2. Impact Velocity Regions

High-velocity/hypervelocity impact is a course with huge energy releasing, high temperature, and pressure. The increase of entropy due to the strong shock wave is enough to lead to materials structures change, damage and even meltingness, vaporization, and ionization [5]. For a certain projectile-target group, velocity is the only factor for determining impact effect and its change brings different damage mechanisms of materials. Therefore, impact velocity region determination is one of the basic problems in high-velocity/hypervelocity impact.

2.1. High-Velocity Lower Limit

If the dynamic pressure is lower than the dynamic yield strength, the material is elastic. With dynamic pressure increase the material enters into the plastic state and quasifluid state as 2-3-4 in Figure 1 [6]. In elastic and plastic states, the material strength plays an important role, while in quasifluid state the compressibility does. So it is reasonable to regard the quasifluid state as the high-velocity penetration region and the state that compressibility takes an obvious leading position as the hypervelocity penetration one.

(a)

(b)

Based on experiments of metals, Weirauch [7] proposed a classification method (Table 1) with the dimensionless parameter (where is target material density, is the impact velocity, and is the strength parameter of target material) to evaluate impact patterns. Though it describes material characters well, the meaning and value of are not clear. Jing [8] suggested that if ( is the pressure, is the dynamic yield strength, and is the constant which shows the relationship between and , ), 1D-strain curve is very close to the hydrostatic pressure curve and material could be looked as fluid. Additionally, Walters and Zukas [9] took the velocity corresponding to the pressure (where is the dynamic yield stress) as the critical value and solved penetration problems by Bernoulli equation without considering the strength effect of target. Based on the requirements of Jing [8] and Walters and Zukas [9], the following equation can be obtained:

Walker [10] found that if the expansion speed of cavity is larger than ( is the bulk sound speed), the target strength can be neglected. Qian and Wang [11] found that if the cavity-expansion speed is larger than ( is the longitudinal wave speed), the target material would enter into quasifluid state.

Fomin et al. [5] advised that if the errors between theoretical calculating results and the average values of experiments are less than 10%, target material strength can be neglected and the corresponding value of critical velocity is equal to ( is the material dynamic hardness and is equal to the specific plastic deformation work, ) and the following equation is obtained

The critical velocities of different materials neglecting the strength from different methods are shown in Table 2. It can be seen that the results of different methods have great differences. The results of concrete and granite from (1) and are coincident, while those from (2) and are not. The difference of (2) is due to the premise that the errors should be within 10%. If the error value is smaller, the results from (2) and would be closer to those from (1) and . Above all, it is reasonable to consider the quasifluid velocity as the critical value of high-velocity penetration.

2.2. Hypervelocity Lower Limit

At present, most of documents [2, 3] defined the velocity that semispherical crater appears as hypervelocity according to experimental phenomena. Jonas and Zukas [12] suggested that the compressibility could not be neglected if the impact velocity is 3~12 km/s. However, it is only a rough evaluation. Jing [13] regarded the value corresponding to atomization appearance as the boundary of hypervelocity. Fomin et al. [5] found that, when Mach number ( and are the impact velocity and material sonic speed, resp.) is closed to 0.75, target material would be damaged and even phase states transformation and some explosion properties appear. Wang [14] introduced Mach number and considered the impact velocity and the temperature and pressure change and used Bridgman equation of statewhere , and are initial volume and pressure, respectively, is hydrostatic pressure, and is the volume change results from . and are the coefficients depending on temperature. If is greater than 0.75, the hydrostatic pressure would be much greater than the shear stress component, which means that the compression deviates the linear rule and enters into phases transition region and the compressibility occupies the leading position. It is reasonable to regard as the critical velocity for hypervelocity impact. In fact, if the velocity is larger than , there are microwave spectrum, infrared spectrum, visible spectrum, ultraviolet ray spectrum, and electromagnetic radiation ionization [5] with the velocity increasing, so the region could be divided into many secondary regions further. The evaluation methods for hypervelocity impact of Wang and Jing are similar and they have physical bases and high suitability for regarding as the critical value of hypervelocity impact.

Above all, the points that the strength could be neglected and the compressibility occupies the leading position are the two typical states, so it is reasonable to define high-velocity and hypervelocity impact regions with them. However, there are differences in the methods for determining critical value of high-velocity impact and this needs further research.

3. Crater Effect of Spherical Projectile Penetration into a Semi-Infinite Target

Spherical projectile penetration into semi-infinite target is a typical problem of high-velocity/hypervelocity impact. Besides obvious plastic deformation, there are also meltingness, vaporization, and ionization. It is difficult to describe the crater effect through introducing equation of state suitable for a wide-range pressure in theoretical models. Generally speaking, the impact progress can be divided into four regimes as Figure 2(a) shows [2]. Because the ratio of length to diameter is small, the projectile has been completely eroded in transient shock regime and steady state regime does not appear. The momentum field change in the target leads to cavitation as Figure 2(b) shows. Transient shock regime and cavitation regime form a complicated course, which increases the difficulty of theoretical research. Therefore, the researches on projectile penetration into semi-infinite target all focus on empirical formulae, and theoretical models are rare.

(a)

(b)

3.1. Crater Shape

Since the 1950s, researchers [15–22] carried out lots of semi-infinite targets high-velocity/hypervelocity impact experiments by the spherical projectiles. Most of the target materials are ductile metals such as aluminum, copper, steel, and Lead. The basic relationship between the crater shape and impact conditions was obtained. For impact on target of low strength and density by projectile with high strength and high density, the projectile kept intact and a deep-hole crater with a diameter a little greater than that of projectile is formed [2, 3]. If impact velocity is high enough, the projectile would deform and even get crushed, and the crater would change to another kind of shape and the crater depth decreases with impact velocity. This also appears for projectile with low strength and low density penetration into target of same material or the material with high strength and density [2, 3]. For higher impact velocity, projectiles crush in transient shock regime and craters are closed to semisphere as shown in Figure 3(a). So the semispherical crater is generally regarded as the typical state of hypervelocity impact [2, 3, 13]. For impact with the spherical projectile, the crater is semispherical for any projectile-target groups.

(a) [3, 13]

(b) [25, 26]

The semispherical crater theory received great challenges from many experiments. Stanyukovich [23] found that the crater could be flat with in the research on the vaporization characters of materials under high pressure. From tungsten projectile hypervelocity impact on aluminum target experiments, Leontyev [24] found that when the impact velocity reaches 15 km/s, the crater shape changes from semispherical to flat. Murr et al. [25] and Baker [26] obtained a deep-hole crater whose depth is almost equal to the diameter (see Figure 3(b)) from aluminum target penetration experiments by stainless steel projectile, respectively. Yu et al. [27] pointed out that the semispherical crater is not applied to any case and proposed the symmetrical cavitation theory and regarded the symmetrical cavitation of the crater in all directions as the feature of hypervelocity impact. Based on the hypervelocity impact phenomena of rocks, Öpik [28], Gault [29], and Dence et al. [30] found that the crater diameter is greatly larger than depth and so are most of meteor craters. For example, meteor crater in Arizona is 1240 meters in diameter and 170 meters in depth [31].

Most of researches regarded that hypervelocity impact can form semispherical craters; however, the targets are metals and the impact velocities are less than 8 km/s, so the semispherical crater has no universal applicability. The crater shapes for projectiles impact on metal targets with larger velocity and high-velocity/hypervelocity impact on geologic materials still need to be studied further.

3.2. Crater Scaling Laws and Empirical Formulae

Impact crater is a complicated dynamic progress which involves density, strength, sonic speed, specific heat, melting point, and boiling point of both projectile and target materials. The crater diameter and depth are generally calculated with empirical formulae which are established by dimensional analysis from experimental data so far.

Zhang and Huang [3] chose projectile diameter (), target density (), and target strength () as the three independent physical parameters, and dimensionless crater depth and diameter were obtained as follows:where is the bulk sound speed, is the specific heat, is the melting point, is the boiling point, is the melting heat, is the boiling heat, and subscripts and denote projectile and target, respectively.

Westine and Mullin [32] discussed the effects of inertia, strength, compressibility, heating, liquefying, vaporization, and so on, and six dimensionless parameters were obtained as follows:where and are the target material specific heats corresponding to solid and liquid states, respectively. and could approximately be constants.

For the research at present, the proportions of melting and vaporization effects are little, and (4a)-(4b) can be expressed aswhere is the relationship between the inertia and strength, is the ratio of densities, is the ratio of strengths, is the ratio of bulk sound speeds, and is ratio of inertia and compressibility [33]. The fitting equation can be obtained from (6a)-(6b) and experimental data. Herrmann and Wilbeck [2] had summarized the empirical formulae obtained during 1958–1987. Yu et al. [27] proposed an empirical formula for the crater depth of metal target. These formulae can be expressed uniformly aswhere , , and are the parameters obtained by experimental data fitting. The values of , , and dimensionless velocity are shown in Table 3.

It can be seen from Table 3 that the main forms of dimensionless impact velocity are , , , and . The difference of shows the different understandings for crater mechanism of hypervelocity impact. , , and could be looked as the same form which highlights the importance of inertia and strength of target material, while emphasizes the leading position of compressibility. From Figure 2(b), it can be known that the pressure peak at the impact moment can affect the crater progress and the plastic flow of materials in cavitation regime is controlled by inertia and strength. The empirical formulae with inertia, strength, and compressibility considered were established, and the representative ones are Sedgwick’s, Xiang’s, and Luo’s equations.

Sedgwick’s equation [34]:

Xiang’s equation [35]:

Luo’s equation [36]:

From (8), (9), and (10), it can be found that the power’s absolute values of (0.235, 0.28, and 0.23) are all greater than those of sonic speed (0.106, 0.11, and 0.20). The ratios of power’s absolute value of and in Sedgwick’s and Xiang’s equations are both more than 2, which illustrates that the strength takes more important role in crater progress than compressibility. Yu et al. [27] pointed out that the transient shock regime is short, and the second regime in which density and strength occupy leading position lasts a longer time. So the density and strength are considered as the main parameters of affecting crater size. Additionally, most of the dimensionless impact velocity power is equal to or close to 2/3 which is the well-known 2/3 power law and is considered to be suitable to calculate crater depth by Yu et al. [27]. However, Baker [26] thought that the relationship between the crater diameter and impact velocity is not like (7) but linear. From Figure 4, it can be found that when impact velocity is less than 14 km/s the predicated results of the power function and linear function are similar; however, if impact velocity is larger than 14 km/s the results of them are different. So Baker thought that the linear relationship is more suitable to describe the crater effect for high-velocity impact than power functional relationship. Guo [37] also gave the same conclusion as Baker. Because their data samples are few and there is still uncertainty for the hypothesis that the crater of higher velocity impact is semispherical, the conclusion that the linear function is more suitable to describe crater parameters than power function still needs to be confirmed further. Merzhievsky [38] established a predicted model considering the strain rate effect and gave the reason why the power of impact velocity is not equal to 2/3. He pointed out that the strength can affect the power and the kinetic energy would play a more important role than momentum. Additionally, the crater empirical formula for projectile hypervelocity impact on rock proposed by Gault [29] agreed with the 2/3 law. So it can be said that the 2/3 law can describe crater effect well.

3.3. Simple Theoretical Model for Crater

Because of the special characteristics of materials such as large deformation, multiphase, and nonlinearity, there are few of strictly theoretical models for crater parameters. Watts and Atkinson [39] pointed out that the plastic flow should be taken into account in crater radius analysis. With Bernoulli equation, Atkinson built a crater diameter calculation model for metal target under hypervelocity impact considering the dispersion effect:where means the power of impact velocity is less than . The calculating method for crater depth was also obtained aswhere is the slope of the relationship curve between shock wave velocity and particle velocity. Equation (12) indicates that with impact velocity increase the power changes from 1/3 to 2/3 which agreed with the 2/3 law.

Zhou [40] established a projectile motion equation with the particle velocity and Bernoulli equation and obtained the calculating method for crater depth aswhere is the shape coefficient of projectile. Based on the linear relationship between crater volume and projectile kinetic energy, the calculating method of crater radius was also established aswhere is the boiling energy of target and is the amending coefficient with crush and kinetic energy of target considered. Equation (13) is just suitable for the penetration that the projectile is unbroken. Equation (14) has a certain physical base and considers the plastic flow; furthermore, is defined as the parameter that is related to material crushing and kinetic energy.

Considering the similarity between impact crater and explosion crater and the impact pressure attenuation, Kadono and Fujiwara [41] established a crater depth calculation method for projectile ranges from unbroken to eroded by introducing a dimensionless coefficient :where , , and are all constants and is the function of impact velocity. This model reflects the effect of projectile states; however, some constants need to be obtained by experimental data fitting.

Though some parameters of the theories above depend on experimental results, they reveal some regularities of crater effect.

4. Theory of Long Rod Projectile Penetration into Semi-Infinite Target

Earth penetrator and armor piercing projectile are both long rod and have great penetration ability, so the researches on long rod penetration have received intensive attention. Experiments [42–53] show that with impact velocity increase long rod changes from rigid to deformed then to semifluid and to quasifluid state at last [54] as Figure 5 shows. So it is necessary to build a multistage engineering calculation model including different projectile states. Quasifluid projectile penetration can be solved with Bernoulli equation [55–57]. The crater depth is not related to the impact velocity but projectile length and (where and are the densities of projectile and target, resp.). For rigid projectile penetration, satisfying results can be obtained with cavity-expansion theory [58–62] and internal friction theory [63–69]. In the internal friction theory, the higher stress and the rapid velocity change occur only in a certain narrow zone; the stress wave is almost identical to a shock wave and exhibits “short wave” properties. Therefore, in the plastic region, the material’s compressibility is considered with the sound speed. In the cracked region, the unstable propagation and spontaneous growth of crack were used to get the boundary conditions. The researches on determining projectile state, the engineering calculation models for semifluid projectile, and deformed projectile penetration are reviewed below.

4.1. Division of Projectile Penetration States

From Figure 5, it can be seen that the upper limit and lower limit of semifluid projectile penetration and the lower limit of deformed projectile are three critical points for dividing penetration states. As the impact velocity increases, the final depth of penetration approaches a hydrodynamic limit in the quasifluid regime. Semifluid and quasifluid states are both obtained with Bernoulli equation. When the impact velocity reaches a certain value, the effect of strength is very small. Additionally, most of the impact velocities of earth penetrators and armor piercing projectiles are within semifluid state range [54, 70], so and are the key points for dividing projectile penetration states.

Based on Forrestal’s cavity-expansion theory [71], Li and Chen proposed a dimensionless calculating method for rigid projectile penetration depth [62]; the determining method for was deduced as follows [70]:where is the dimensionless parameter obtained by experimental data fitting, is the dimensionless parameter of target, is the dimensionless warhead shape parameter, is the projectile mass, is the target material strength, and is the dimensionless projectile shape parameter.

Based on the experimental results of concrete, Mu [72] used the moment that warhead appears semisphere as the up limit of rigid projectile penetration; according to the relationship between mass loss rate of projectile and initial impact kinetic energy, was obtained aswhere and are both empirical constants and is the mass proportion of spherical warhead to whole projectile.

According to Segletes’s [73] view that the projectile was constrained by target in initial penetration phase and the erosion is difficult to occur, Lou [74] used the Bishop et al. [75] and Hill’s [76] critical pressure of crater for the compressible materials and Rosenberg’s relation [77, 78] obtained:

The determining methods for proposed by Chen, Li, and Mu all need experimental data fitting. The method presented by Lou does not depend on experiments; however, there are great differences between the predicted results and experiments. Calculations show that these methods can only give rough ranges, so it is necessary to research more accurate ones with physical and mechanical bases.

The determining method for the lower limit of semifluid projectile was proposed by Tate [57] who presented the critical velocities for different projectile-target groups as

In 1977, Tate [79] deemed that the lower limit is related to the erosion rate and propagation of plastic wave, and if the former is greater than the latter, the projectile would enter into semifluid state, and obtainedwhere is the shear modulus of projectile material. Calculations manifested that the results of (19) are closer to experiments than (20) and could evaluate the states of deformed and semifluid projectiles well.

4.2. Engineering Calculating Model for Semifluid Projectile

For semifluid projectile penetration, mere portion of projectile is quasifluid. Therefore, the strength of projectile and target could not be neglected. Alekseevskii [80] and Tate [57] established the famous modified Bernoulli equation successively with projectile erosion considered:Equation (21) was applied widely and researched deeply on how to determine the strength team of projectile and target and how to consider the effect of mushroom head.

Alekseevskii [80] used dynamic hardness of target as the strength team and obtained has explicit physical mean that is plastic work of unit material deforming and has been used by researchers in former Soviet Union to describe material strength. Zlatin and Vitman’s book proposed the testing methods for dynamic hardness and also pointed out that it reflects the deformed obstruction of material under local extrusion of dynamic loading [81–84].

Tate suggested is equal to elastic limit value [57]:where is the Poisson ratio and is the yield strength under uniaxial stress. The physical mean of is not clear and depends on elastic-plastic analysis. Tate gave new forms of and with the fitting results from experimental data [85, 86]:where is the dynamic yield strength of target and is Young modulus of target. It can be seen that Tate modified the model by changing strength term of target and also illustrated the complexity of target strength determination.

Sun et al. [87] supposed that both the inertia and the strength of target affect the penetration. They took the difference between cross-sectional area and pressure area of crater bottom into account and proposed a modified calculating model for long rod:where is the enhanced elastic modulus of target material.

Considering the inhomogeneity of the force distributing from mushroom head to centerline of long rod during penetration, Rosenberg et al. [88] obtained a modified Bernoulli equation by introducing the equivalent area as

Zhang and Huang [89] regarded the warhead of long rod as hemisphere during the penetrating progress and obtained the A-T model by using Rosenberg’s method. The strength steam of projectile and target could be expressed as

The derivation of (25), (26), and (27) has same two main points. Firstly, the view that the cross-sectional area of mushroom head is two times the warhead’s was adopted. Secondly, the target strength was determined with cavity-expansion theory.

Based on numerical calculation results, Anderson et al. [90] deduced the deformed range of projectile and obtained the relationship between resistance and penetrating velocity with the cylindrical cavity-expansion theory and established a modified Bernoulli equation as

Wen and Lan [90–92] divided the original plastic zone into fluid zone and plastic zone (Figure 6). They supposed that if impact velocity is greater than the critical velocity , the quasifluid part thickness in target material would keep invariant. Hence, a modified Bernoulli equation was obtained aswhere is the static resistance and is the critical velocity, .

Equations (28a), (28b), and (29) take the effect of impact velocity into account. Tate [57] pointed out that strength may change with penetration depth and velocity, so the strength terms in (28a), (28b), and (29) are closer to the penetration process than other models. The measurement of dynamic hardness in Alekseevskii’s model has taken the effect of impact velocity into account. Kozhushko et al. [93] also proposed a strength determining method considering the effect of impact velocity as

Above all, target material strength and the difference between cross-sectional area of projectile and area of bottom are two key factors in engineering calculating model for semifluid projectile, and which are all neglected in models above. It is necessary to establish a new calculating model considering the integrated effects.

4.3. Engineering Calculation Models for Deformed Projectile

From the experiments of metal [42, 43], dry sand [44, 45], rock [46], and concrete [47–55], it can be found that with impact velocity increase projectile can sustain obvious erosion, blunting, even bending, and crushing, and penetration depth decreases greatly. Projectile deformation is closely related to the design and optimization for high-velocity/hypervelocity weapon. Penetration mechanism of deformed projectile has been a hot topic at present. He et al. [54] summarized the research progress of projectile erosion effect for projectile penetrating into concrete and mainly analyzed the physical progress of projectile erosion and mass loss and pointed out that the projectile erosion research under the coupling effect of melting and shearing needs to be developed further. Because of the above, the engineering calculating models for deformed projectile are focused on here.

Zhao et al. [94] pointed out that with initial impact velocity increase warhead changes from ogival to semispherical and even more blunt. According to the linear relationship between initial impact velocity and the shape coefficient of remaining warhead , the relationship between shape coefficient of warhead and instantaneous penetration velocity was established aswhere is a fitting parameter and is the shape coefficient of initial warhead. According to the calculating method proposed by Li and Chen [62], the current projectile mass during penetrating was given by using the Silling and Forrestal empirical formula [95]:where is the projectile current mass, is the projectile initial mass, and is the fitting coefficient.

Supposing that the projectile mass and warhead shape keep invariant within a time during penetration, a penetration calculating model for deformed projectile can be obtained from (31) and (32) and Forrestal et al.’s [71] rigid projectile penetration calculation method. Though this model is a semiempirical formula, it is realizable and can be used in calculation.

Zhao [51] supposed that the relationship between warhead mass loss and velocity is fully quadratic polynomial; the warhead shape would change from ogival to semispherical, then to obtuse and flat with impact velocity increases. The relationship between residual projectile mass and shape was obtained aswhere is the projectile radium, is the warhead length converting coefficient of residual projectile, and is the projectile original length. Zhao wrote a program for calculating penetration depth whose results are in good agreement with experiment data for low impact velocity; however, there are great differences between them when velocity is above 1200 m/s.

He [96, 97] found that the effect on penetration depth is not the mass loss but the warhead shape. According to Jones’s [98] expression of projectile mass loss, by introducing a correction coefficient to describe the effect that material shedding and target material hardness on projectile mass loss, He [97, 99] gave the expression of mass increment:where is the correction coefficient, is the coefficient related to the projectile shape, is the shear strength of target material, is the melting heat of unit mass projectile, is the force on projectile, is the projectile shape coefficient, and is the penetration velocity. Warhead shape keeps invariant within every calculating time step, and after that shape can be determined from the increment of warhead mass. The increment of penetration depth is obtained as

He’s model can predict not only projectile mass loss and nose shape blunting but also penetration depth, time histories of projectile velocity, and accelerated velocity. Additionally, He [97] also established a model for describing friction work rate within unit area of projectile. He extended Jones’s model to predict local projectile mass loss and built another numerical calculating model for simulating projectile mass loss and nose shape blunting. The cavity-expansion theory was used to describe surface pressure of projectile in the two models; however, the projectile surface backing because of mass loss could affect surface pressure. Additionally, the target material may have entered into quasifluid state and different models to describe surface pressure are needed.

Yang [100] deduced the dimensionless equation of mass loss for projectile penetration into concrete:where and are the dimensionless parameters obtained by experimental data fitting as shown in Figure 7. is the Mohs hardness of target. From (36), the projectile erosion speed can be expressed aswhere is the friction coefficient and is the intersection angle of tangential direction and axial direction of warhead. Using (36) and (37), Yang constructed a set of difference equations in which the results indicated that erosion has little influence on penetrating depth.

Wen and Lan [101] supposed that the change of warhead just happens at the moment of impact and then keeps spherical and cross-sectional area keeps . As shown in Figure 8, the velocities of particles in deformed zones are all . There are jumps for particle velocity and cross-sectional area in surface EP and the pressure in EP is uniformity, and the crater area keeps invariant. The relationship between velocity of projectile tail and penetration velocity can be obtained aswhere is the penetration velocity and is the force on unit area of warhead after deformation. Based on the results of experiments and numerical simulations, the following equation is yieldedwhere is determined by experiments. The calculating equation of penetration depth for deformed projectile was obtained as

Rosenberg and Dekel indicated that the deformation of warhead takes place within a short time in the initial phase of impact [78] as Figure 9 shows. With Rosenberg’s view, Lou [74] considered that the instantaneous deformation leads to the cross-sectional area increases and then projectile keeps steady. According to the results of Forrestal and Warren [102] and Rosenberg and Dekel [78], Lou modified the target resistance on indeformable long rod projectile by multiplying a cross-sectional coefficient (see Figure 10) and obtained a calculation equation of deformed projectile penetration depth with Forrestal’s model:

Equations (40) and (41) both take the warhead blunting into account. Equation (40) considers the change of projectile during the blunting progress while (41) does not. At the same time, it can be seen that there is no conclusion on the effect of projectile mass erosion. The effect of warhead blunting and erosion on penetration still needs to be studied more clearly and the blunting degree prediction of warhead depends on experiments greatly.

5. Conclusions

Through many decades of research, the preliminary evaluation of velocity for projectile high-velocity/hypervelocity impact on semi-infinite target, crater effect of spherical projectile, and penetration depth calculating model for long rod projectile have been established; however, there are some problems which need to be solved further.(1)The situations that the strength could be neglected and the compressibility takes leading position can be seen as the conditions for high-velocity and hypervelocity impact. However, a more accurate method for determining the critical value of high-velocity impact is needed.(2)The semispherical crater shape is not suitable for all conditions in hypervelocity impact by spherical projectiles. The crater shapes of metal targets for impact velocity above 8 km/s and geologic material target in hypervelocity impact need to be ascertained. The empirical formulae and theoretical models for geologic materials cannot meet the practical needs and should be studied further.(3)For long rod projectile penetrating into semi-infinite target, the current evaluation methods for upper limit of rigid projectile state can just give rough ranges and there is a need to establish a multiphase calculation model including all states.(4)The target material strength and the difference between projectile sectional area and pressure area of crater bottom influenced by penetration velocity are two key factors for semifluid projectile penetration. The engineering calculating model considering the effect of them for semifluid projectile is needed to be established.(5)It is necessary to establish a new engineering calculating model which is more suitable to penetration physical and mechanical characteristics for deformed projectile.

Conflict of Interests

The authors declare that there is no conflict of interests regarding the publication of this paper.

Acknowledgments

The authors gratefully acknowledge the financial supports from Program for Changjiang Scholars and Innovative Research Team in University (no. IRT13071), the Science Fund for Creative Research Group of the National Natural Science Foundation of China (Grant 510210001), projects supported by the National Natural Science Foundation of China (Grants 51409258, 51309233, and 51378498), and project supported by State Key Laboratory for Disaster Prevention & Mitigation of Explosion & Impact Foundation (Grant DPMEIKF201301).

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