摘要
该文用数字图像相关方法测量了聚碳酸酯板的张开型应力强度因子(SIF)。实验过程中以聚碳酸酯标准紧凑拉伸试样为样本,由数字图像相关(DIC)方法提取不同载荷下裂纹附近的全场位移。在已计算得到全场位移的情况下,由线弹性断裂理论可知,弹性区域内每一点位移可表示为SIF的函数。在计算SIF时考虑了实验中不可避免存在的钢体平移与转动的影响,应力强度因子、钢体平移与转动可由最小二乘法计算得到;还讨论了位移场的选择及位移展开项项数对SIF的影响。实验结果与理论值进行了比较,结果显示DIC方法准确地测量了聚碳酸酯板的应力强度因子,因此DIC为测量SIF提供了一种有效的试验方法。
The application of the digital image correlation （DIC） method to determine the stress intensity factor （SIF） for cracks in Polycarbonate is proposed in this paper. Standard compact tension specimen was tested under tensile loading and the full-field displacement fields of the test sample were recorded using DIC. According to linear elastic fracture mechanics, the SIF associated with unavoidable rigid-body displacement translation and rotation were calculated simultaneously from the experimental data by fitting the theoretical displacement field using the method of least-squares. Selection of displacement and convergence values is discussed. The effectiveness and accuracy of the proposed technique is verified by comparison with theoretical results, which reveals that the DIC is a practical and effective tool for full-field deformation and SIF measurement.
出处
《工程力学》
EI
CSCD
北大核心
2012年第12期22-27,39,共7页
Engineering Mechanics
作者简介
张蕊（1982--），女，吉林舒兰人，博士生，主要从事无损检测研究（E-mail：zrui0310@163．com）．
通讯作者：贺玲凤
（1961-），女，江西莲花人，教授，博士，主要从事实验力学无损检测研究（E-mail：lflae@scut．edu．cn）．
