Mechanical behaviors and damage constitutive model of ceramics under shock compression
Source: Acta Mechanica Sinica, Volume 24, Number 3, June 2008 , pp. 305-315(11)
Abstract:One-stage light gas gun was utilized to study the dynamic mechanical properties of AD90 alumina subjected to the shock loading. Manganin gauges were adopted to obtain the stress-time histories. The velocity interferometer system for any reflector (VISAR) was used to obtain the free surface velocity profile and determine the Hugoniot elastic limit. The Hugoniot curves were fitted with the experimental data. From Hugoniot curves the compressive behaviors of AD90 alumina were found to change typically from elastic to “plastic”. The dynamic mechanical behaviors for alumina under impact loadings were analyzed by using the path line principle of Lagrange analysis, including the nonlinear characteristics, the strain rate dependence, the dispersion and declination of shock wave in the material. A damage model applicable to ceramics subjected to dynamic compressive loading has been developed. The model was based on the damage micromechanics and wing crack nucleation and growth. The effects of parameters of both the micro-cracks nucleation and the initial crack size on the dynamic fracture strength were discussed. The results of the dynamic damage evolution model were compared with the experimental results and a good agreement was found.
Document Type: Research Article
Affiliations: 1: State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, 100081, Beijing, China 2: State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, 100081, Beijing, China, Email: email@example.com 3: Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, CAEP, 621900, Mianyang, China
Publication date: June 1, 2008