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Dynamic failure in ductile porous materials

✍ Scribed by Ze-Ping Wang; Jian Zheng

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
973 KB
Volume
49
Category
Article
ISSN
0013-7944

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✦ Synopsis

In this paper, a mathematical model of dynamic fracture in porous ductile materials under intense dynamic general loading is developed. The mathematical model includes the influence of inertial effects and material rate sensitivity, as well as the contribution of surface energy of a void and material work-hardening.

In addition, the condition of the void compaction is considered as well. The threshold stresses for the void growth and compaction are obtained. A simple criterion for ductile fracture which is associated with material distention and plastic deformation is adopted.

As an application of the theoretical model, the processes of two-dimensional spallation in LY 12 aluminum alloy are successfully simulated by means of two-dimensional finite-difference Lagrangian code.

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