Numerical Simulation of Ballistic Performance of Nanocrystalline and Nanotwinned Ultrafine Crystal Steel

Abstract:

Surface mechanical attrition treatment (SMAT) is an excellent method to get nanocrystalline and nanotwinned ultrafine crystalline steels from coarse-grained AISI 304 stainless steel. Due to their outstanding mechanical properties, they both appear to be relevant candidates for ballistic protection of marine engineering. Comparing their ballistic performance against coarse-grained steel, as well as identifying the effect of the hybridization with a carbon fiber–epoxy composite layer have been done by Jaime Frontan et al. Hybridization is proposed as a way to improve the nanocrystalline brittle properties in a similar way as is done with ceramics in other protection systems. Dur to the limit of experimental equipment, there are many results which are hardly got. In this paper, a numerical method with Johnson–Cook flow stress model, user material subroutine VUMAT and surface-based cohesive behaviour is presented.

• Periodical: Materials Science Forum (Volume 813)
• Pages: 285-292
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.813.285
• Online since: March 2015
• Authors: Yun Wan*, Jian Lu, Li Min Zhou
• Keywords: Ballistic Impact, Damage Evolution, Hybrid Material, SMAT

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