1. Effect of grain boundary structure on plastic deformation during shock compression using molecular dynamics.
- Author
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Fensin, S. J., Valone, S. M., Cerreta, E. K., Escobedo-Diaz, J. P., Gray III, G. T., K. Kang, and J. Wang
- Subjects
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CRYSTAL grain boundaries , *QUASISTATIC processes , *DYNAMIC testing of materials , *MOLECULAR dynamics , *DEFORMATIONS (Mechanics) , *STRENGTH of materials - Abstract
Grain boundaries (GBs) can play an important role in governing the mechanical behavior and damage evolution of a material during both quasistatic and dynamic loading. However, the general consensus of the shock physics community has been that minute details about theGBstructure should not affect the response of a material to dynamic loading. In this paper, we present results of molecular-dynamics simulations investigating whether or not small changes in boundary structure are 'recognized' by the shock wave and can in turn affect the spall strength of a material. As a test case, we study a Σ11 asymmetric tilt GB in copper with an ordered and a disordered structure. The results are also compared with face-centered-cubic single crystals which correspond to the crystal orientations of the two grains in the bi-crystal. These results show that ordered and disordered boundaries undergo dissimilar amounts of plastic deformation during shock loading, which leads to spall strengths that vary by 12%, likely due to differences in the GB structures. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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