Articles

The Unloading Characteristics of Metal in During Dynamic Response

  • HUANG Yong;PAN Hao;HU Xiaomian
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  • National Key Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100094, China

Received date: 2011-11-27

  Revised date: 2012-03-16

  Online published: 2012-04-08

Abstract

The unloading characteristics are studied to explain the difference between the simulation results and the experimental data in this paper. The different elastic-plastic limiting conditions between the loading and the unloading processes are used to describe the quasi-elastic unloading of the earlier unloading. The critical damage model and the Steinberg-Guinan constitutive model are used to simulate the shock-unloading spallation process and the second loading process of Fe and Al. The simulation results indicate that the method used in this paper can describe quasi-elastic phenomena reasonably well. The results of the damage evolution and the spallation compare favorably with the experiment data at the complete spallation. But in the case of Al experiment, the incomplete spallation occurs because of the lower shock velocity, and it can not be described well with the macroscopic damage evolution model, which explains the difference between the simulation results and the experimental data.

Cite this article

HUANG Yong;PAN Hao;HU Xiaomian . The Unloading Characteristics of Metal in During Dynamic Response[J]. Science & Technology Review, 2012 , 30(10) : 29 -33 . DOI: 10.3981/j.issn.1000-7857.2012.10.003

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