On strength of aluminum under high pressure and high strain rate based on crystal plasticity theory

PAN Hao; WANG Shengtao; WU Zihui; HU Xiaomian

doi:10.11883/bzycj-2018-0084

Volume 39 Issue 2

Feb. 2019

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PAN Hao, WANG Shengtao, WU Zihui, HU Xiaomian. On strength of aluminum under high pressure and high strain rate based on crystal plasticity theory[J]. Explosion And Shock Waves, 2019, 39(2): 023102. doi: 10.11883/bzycj-2018-0084

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PAN Hao, WANG Shengtao, WU Zihui, HU Xiaomian. On strength of aluminum under high pressure and high strain rate based on crystal plasticity theory[J]. Explosion And Shock Waves, 2019, 39(2): 023102. doi: 10.11883/bzycj-2018-0084

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On strength of aluminum under high pressure and high strain rate based on crystal plasticity theory

doi: 10.11883/bzycj-2018-0084

Institute of Applied Physics and Computational Mathematics, Beijing 100094, China

Received Date: 2018-03-16
Rev Recd Date: 2018-05-24
Publish Date: 2019-02-05

Abstract

Abstract

Dynamic behaviors of metal materials are very complex under extreme loading conditions such as high pressure and high strain rate loading. Actually, many mechanisms and effects are contained in the dynamic response of metal materials. In this paper, a thermoelastic-viscoplastic crystal plasticity model is developed to study the plastic deformation of aluminum (Al) materials under high pressure and high strain rate loading. In the model for single crystal, both the thermally-activated mechanism and the phonon drag mechanism are considered for dislocation glide which make the model applicable for a much wide deformation rate range. In addition, the density of the mobile and immobile dislocation is formulated according to the annihilation and multiplication mechanism. A general harden model is utilized to take strain harden, pressure harden and temperature soften into consideration. Moreover, a high-order Euler elastic equation is adopted to describe the non-linear elastic deformation of the materials in large elastic deformation. Furthermore, based on the model developed for single crystal plastic deformation, a polycrystalline model is developed according to the Taylor model and the crystal plasticity finite element method, respectively. The dislocation glide speed in Al materials is predicted by the model and the results agree quite well with the experimental results in a wide shear stress range because both thermally-activated mechanism and phonon drag mechanism are considered for dislocation glide. With the model, the shear strengths of both single crystal and polycrystalline are predicted, and it is found out that the shear strength of Al materials increases with increasing of the load pressure. Besides, significant anisotropy of the shear strength is revealed for single crystal Al materials although it is a typical FCC crystal with high symmetry. Finally, texture evolution of polycrystalline Al materials is studied with the model and the preferred orientation effect of the crystal is found for different loading pressures. Moreover, the preferred orientation effect is more significant for high loading pressure.
- crystal plasticity theory,
- high strain rate,
- Euler elastic equation,
- texture evolution

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References

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