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Direct numerical simulation of ductile spall failure

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Abstract

Large-scale direct numerical simulations of void growth and coalescence from 3-dimensional distributions of void nucleating particles are used to investigate the effect of material strain hardening and strain rate sensitivity on spall response. The computational model spans multiple particle spacings in the in-plane directions, and several finite elements span the initial particle diameters in the mixed-zone Arbitrary Lagrange–Eulerian (ALE) simulations. The matrix material is represented by traditional plasticity models in which material failure is not permitted. The 1000\(+\) particles are represented by the same material model as the surrounding matrix except the particles have low tensile strength to permit fracture, which is used to simulate particle cracking or decohesion. Voids grow and coalesce naturally in the ALE framework, and the simulations produce dimpled failure surfaces similar to those observed experimentally in spalled samples. The strain hardening and strain rate sensitivity of the matrix material are altered to explore their influence on the void growth and coalescence processes and on the simulated free surface velocity. The details available from the computational model permit association of the longitudinal stress evolution with features on the free surface velocity profile.

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Notes

  1. While applicable at this size scale, crystal placity is neglected.

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Acknowledgements

The author is grateful for the support US Army Research Laboratory. The findings in this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents. Approved for public release; distribution is unlimited.

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  1. Impact Physics Branch, US Army Research Laboratory, Aberdeen Proving Ground, MD, USA

    Richard Becker

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  1. Richard Becker
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Correspondence to Richard Becker.

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Becker, R. Direct numerical simulation of ductile spall failure. Int J Fract 208, 5–26 (2017). https://doi.org/10.1007/s10704-017-0198-y

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