摘要
利用高速摄影技术与光学焦散线技术相结合,对冲击下正交复合材料I型裂纹尖端的动态应力集中问题进行了光测力学实验研究。记录了两种层状碳纤维/环氧树脂复合材料在冲击作用下I型裂纹尖端的动态焦散斑图,提取反映材料局部应力集中问题的力学参数:焦散斑特征尺寸,进而比较两种复合材料的抗冲击性能。这些研究工作对于复合材料冲击性能评估具有工程应用价值和科学研究意义。
High-speed Schardin photography and optical caustics method are introduced to study dynamic stress singularities of mode-I crack tip in orthotropic composites trader impact. A series of dynamic caustic patterns stranding the crack tip of two kinds of laminated carbon fiber/epoxy resins composites under impact were recorded. Variations of the caustic shape diameter due to the local stress singularity at the crack tip were examined. The characteristic size of caustics that is related to the mechanical parameter of local stress concentration was measured. The impact behaviors of two kinds of composites were compared. These results can help to evaluate strength and predict service life for composite structures.
出处
《工程力学》
EI
CSCD
北大核心
2006年第3期173-176,155,共5页
Engineering Mechanics
基金
国家自然科学基金研究项目(19902008)
关键词
正交复合材料
应力强度因子
焦散线
Ⅰ型裂纹
动态响应
orthotropic composites
stress intensity factors
caustics
mode-Ⅰ crack
dynamic response
