基于能量释放率的界面断裂实验分析方法

基于对断裂力学常用实验方法的研究,结合界面断裂问题的特殊性,以断裂力学为理论基础,通过能量释放率建立了界面断裂测量的实验分析方法,并且利用文献中的实验数据进行了验证,取得了良好的一致性.该方法通过测量试验件的载荷位移关系,利用裂纹扩展过程中的能量变化关系得到该裂纹长度下的临界能量释放率;在此基础上,根据试件的阻抗能量曲线预测结构的最大承载能力.该方法以能量释放率为理论基础,为界面裂纹的强度分析提供了合理的手段,基于能量角度建立的实验分析方法也具有良好的实用性和适用性.

AN EXPERIMENTAL METHOD BASED ON ENERGY RELEASE RATE OF INTERFACIAL FRACTURE

Based on commonly used experimental methods in fracture mechanics, with special consideration of the features of the interface fracture, an experimental method for the interface crack is established in the framework of fracture mechanics. With this method, the critical energy release rate can be obtained through the measurement of the load and the displacement of the specimens, for a given length of a crack. Related experiment data verify the robustness of this method, and the qualified consistency between the set of experimental results and the corresponding ones obtained by this method. Further, with this method, the maximum load capacity of the structure can be predicted according to the impedance energy curve. So, this analytic method is a powerful experimental method for the determination of the strength of the interface crack through the energy release rate with wider applications.