基体裂纹-异型夹杂相互作用焦散线实验研究  

EXPERIMENTAL STUDY ON CAUSTICS OF INTERREACTION BETWEEN MATRIX CRACK AND DIFFORMITY INCLUSION

作　　者：岳中文[1] 韩瑞杰[1] 郝文峰[2] 刘伟[2] 姚学锋[2] 

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083 [2]清华大学工程力学系,北京100084

出　　处：《工程力学》2015年第10期198-202,共5页Engineering Mechanics

基　　金：国家自然科学基金面上项目(51374210);国家自然科学基金重点项目(51134025);中央高校基本科研业务费项目(2009QL15);高等学校学科创新引智计划项目(B14006)

摘　　要：该文通过透射式静态焦散线方法利用三点弯曲梁断裂实验对异型夹杂与基体裂纹的相互作用进行研究。首先得到不同夹杂情况下I型裂纹尖端的焦散斑图,引入焦散斑纵横轴长之比?反映焦散斑在夹杂作用下的畸变特性;其次,提取相应的焦散斑特征尺寸,并得到I型裂纹的应力强度因子KI;最后,基于不同夹杂情况下裂尖焦散斑、裂尖应力强度因子与裂尖和夹杂之间距离的关系,揭示不同夹杂对裂纹尖端应力场奇异性影响规律。实验研究结果为含异型夹杂结构的强度设计和断裂性能评估提供实验依据。Three point bending beam fracture experiments were carried out by means of transmission type static caustics method to study the interaction of difformity inclusions and matrix crack. Firstly, the caustic patterns of mode-I crack tip of difformity inclusions were obtained, and then theβ value was introduced, which was defined as the ratio of vertical and horizontal axis of caustic pattern, reflecting the distortion performance of caustic pattern under the effect of inclusion. Secondly, the corresponding feature dimensions of caustic pattern were extracted, and the stress intensity factor KI of mode-I crack tips were obtained. Finally, the impact of difformity inclusions on stress field singularity around the crack tip was revealed based on the relationship of caustic pattern, stress intensity factor and the distance between crack tip and inclusion. The experiment provides reference for strength design and fracture performance assessment of structures containing inclusion.

关 键 词：静态焦散线 异型夹杂 应力强度因子K 焦散斑畸变 裂纹 

分 类 号：O346.1[理学—固体力学]