Abstract
This study presents a quantitative sensitivity analysis for the assessment of fiber reinforced composites (FRCs). Global sensitivity analysis (GSA) approach is based on the variance based method incorporating Random Sampling-High Dimensional Model Representation (RS-HDMR) expansion in which component functions are determined by diffeomorphic modulation under observable response preserving homotopy (D-MORPH) regression. The advantage of the D-MORPH regression lies in its capability to solve linear algebraic equations with a limited number of sample points. The main purpose is to investigate the influence of fiber path, regarded as the design variable, on the formability and structural performance of FRCs. Wherein, spring-back and load-carrying capacity are two meaningful problems to be addressed. Two typical FRCs are included that an L-shaped part with straight fiber path using autoclave manufacturing process and a variable stiffness composite cylindrical shell under pure bending. The work not only focuses on the ranking of design variables but also hopes to find out their interactions represented by the second order global sensitivity indexes. After being tested by three typical numerical functions, the GSA algorithm highlights that spring-back of FRC using autoclave manufacturing process is most sensitive to fiber orientation angles on plies close to the tool. And buckling performance of the VS cylinder is dominated by fiber orientation angles at compression/tension regions.
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Abbreviations
- GSA:
-
Global sensitivity analysis
- GSI:
-
Global sensitivity index
- D-MORPH:
-
Diffeomorphic Modulation Under Observable Response Preserving Homotopy
- RS-HDMR:
-
Random Sampling High Dimensional Model Representation
- χ i :
-
ith input variable
- χ :
-
Input variable vector,χ = (χ 1, χ 2, ⋯ , χ d )
- ρ(χ):
-
Output response
- K d :
-
K d = {(χ 1, χ 2, ⋯ , χ d )|0 ≤ χ i ≤ 1, i = 1, 2, ⋯ , d}
- k , l , m , t :
-
Integers
- N :
-
Total number of sample points
- \( {S}_i/{S}_{i j},{S}_i^T \) :
-
First/second order GSI and total effect index
- φ(χ):
-
Orthonormal polynomial basis
- α , β :
-
Undetermined coefficients in HDMR expansion’s component function
- Q :
-
Cost function
- c :
-
Vector containing all undetermined coefficients
- B :
-
Weight matrix of the cost function
- γ :
-
Fiber orientation angle for VS composite cylinder
- κ :
-
Angle
- T :
-
Design variable of fiber orientation angle
- ρ spring − back :
-
Spring-back for the L-shaped composite part
- ρ cr :
-
Critical buckling load for the VS composite cylinder
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Acknowledgements
This work has been supported by Project of the Key Program of National Natural Science Foundation of China under the Grant Numbers 11572120, 11302266.
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Appendix
Appendix
Penrose conditions
The Penrose conditions for the matrix Hwith the generalized inverse H +:
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Wang, H., Chen, L., Ye, F. et al. Global sensitivity analysis for fiber reinforced composite fiber path based on D-MORPH-HDMR algorithm. Struct Multidisc Optim 56, 697–712 (2017). https://doi.org/10.1007/s00158-017-1681-9
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DOI: https://doi.org/10.1007/s00158-017-1681-9