Simulation of critical behaviour on damage evolution

• Published in: Chinese physics B Vol. 19; no. 3; pp. 402 - 406
• Main Author: 祁美兰 贺红亮
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.03.2010
• Subjects: Computer simulation; Damage; Evolution; Fracture mechanics; Fracturing; Mathematical analysis; Mathematical models; Shot; 临界损伤; 函数模型; 动力荷载作用; 损伤演化方程; 注册会计师; 破坏行为; 自由面速度
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/19/3/036201

Based on a damage evolution equation and a critical damage function model, this paper has completed the numerical simulation of ductile spall fracture. The free-surface velocity and damage distribution have been used to determine jointly the physical parameters D1 （the critical linking damage）, Df （the critical fracturing damage） and k （the softening rate of critical damage function model） of the critical damage function model, which are 0.11, 0.51 and 0.57 respectively. Results indicate that the parameters determined by any of shots could be applicable to the rest of other shots, which is convincing proof for the universal property of critical damage function. In our experiments, the shock pressure is about 1 GPa to 2.5 CPa. For the reason of limited pressure range, there are still some limitations in the methods of present analysis. Moreover, according to the damage evolution characteristic of pure aluminum obtained by experiments, two critical damages are obtained, which are 0.11 and 0.51 respectively. The results are coincident with the experimental ones, which indicate that the critical growth behaviour of damage occurs in the plastic metal under dynamic loading.