摘要
本文应用损伤理论研究裂纹尖端区域,得到了裂纹尖端的损伤场。根据细观实验分析提出了一个近场损伤准则,建立了宏观力学参量与材料细观组织参量之间的关系,并用实验结果进行了验证。
The damage theory is used to study the region of the crack tip and the crack tip damage field is obtained. A near-field damage criterion D|r=dr =Dc is proposed based on micro experimental analysis and the relationship δc-dT between macro mechanical parameter and the microstructural parameter of material is established. The microstructural change around the crack tip during experimental loading as well as crack propagation has been observed with SEM. The damage criterion relationship is verified by experimental results and it is shown that the stress, strain and damage at a certain distance from the crack tip are important factors for the control of tough fracture.
出处
《华中理工大学学报》
CSCD
北大核心
1989年第3期139-144,共6页
Journal of Huazhong University of Science and Technology
基金
国家自然科学基金资助项目
关键词
裂纹尖端
塑性损伤
损伤准则
断裂
Fracture
Damage
Plastic damage
Crack tip
Damage criterion
