爆炸与冲击2024，Vol.44Issue(1)：60-76,17.DOI:10.11883/bzycj-2023-0237
考虑微结构特征的陶瓷材料含损伤本构模型
A constitutive model for ceramic materials including microstructural features and damage factor
摘要
Abstract
In order to study the impact failure characteristics of ceramic materials with different microstructures,a constitutive model was constructed based on the Deshpande-Evan model which describes the inelastic deformation and fracture behavior of ceramic materials from the perspective of microstructure and the stress state of the material is calculated without considering the constraint condition.In order to verify the validity of the improved model,VUMAT subroutine programming method was used to combine it with ABAQUS finite element software,and it was applied to the analysis and simulation of the impact failure process of typical ceramic materials(YAG transparent ceramics).The effects of strain rate,stress triaxiality,grain size and crack distribution density on the dynamic mechanical behavior and damage evolution mechanism of YAG transparent ceramics were analyzed by using the improved model.The results show that with the increase of grain size and crack distribution density,the damage degree of YAG transparent ceramics increases,and the area of complete damage area increases.The influence of grain size on the macroscopic failure characteristics of YAG transparent ceramics is greater than that of crack distribution density.The failure strength and fracture strain of YAG transparent ceramics decrease with the increase of grain and crack distribution density.With the increase of the strain rate,the peak stress and fracture strain of YAG transparent ceramics under the influence of different factors(grain size as well as initial defect distribution density)increase.With the increase of grain size,the crack propagation speed of YAG transparent ceramics increases first and then flattens out,which is linearly related to the crack distribution density coefficient.The improved model can describe the influence of YAG transparent ceramic microstructure on its macroscopic failure characteristics,and provide support for further analysis of the influence of microstructure on the macroscopic failure characteristics of ceramic materials.关键词
含损伤本构/陶瓷材料/冲击破坏/YAG透明陶瓷/微结构特征Key words
constitutive model involving damage factor/ceramic materials/impact failure/YAG transparent ceramics/microstructure characteristics分类
数理科学引用本文复制引用
刘慕皓,张先锋,谈梦婷,包阔,韩国庆,李逸,孙伟境..考虑微结构特征的陶瓷材料含损伤本构模型[J].爆炸与冲击,2024,44(1):60-76,17.基金项目
国家自然科学基金(12102200,12141202) （12102200,12141202）
江苏省自然科学基金(BK20210320) （BK20210320）
