表面裂纹对掠入射垂直偏振横波散射的动态光弹实验分析

基金项目:

国家自然科学基金(11374325,11427809)资助

详细信息

Experimental analysis on the scattering of the grazing incident vertical shear wave by a surface-breaking crack using photoelastic visualization

1 State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences Beijing 100190;
2 NDT & E Laboratory, Dalian University of Technology Dalian 116085

摘要: 利用动态光弹法研究掠入射垂直偏振横波(SV波)在表面裂纹处的散射声场,给出不同倾斜角度的表面裂纹引起的散射声场分布和简化波前示意图。以垂直表面裂纹为例,有限元仿真和电法测量分别直接地和间接地证明了光弹实验结果的可靠性。表面裂纹引起的各类散射波与裂纹参量密切相关且容易区分,可使用一阶散射声波到达时间反演表面裂纹的长度和倾角,实验测量值与真实值的相对误差在6%以下。

Abstract: The scattering of a grazing incident vertical shear(SV) wave by surface-breaking cracks(SBCs) is studied using the dynamic photoelastic method,and the photoelastic photographs of the wave fields and the explanatory diagrams are presented.Focusing on the vertical SBC,the credibihty of dynamic photoelastic result is proved directly and indirectly by using finite element numerical simulation and electrical method,respectively.The scattered waves generated by the SBC are closely related to the geometry characterizations of crack and can be distinguished easily from each other,so the length and orientation angle of an angled SBC can be calculated using the arrival times of first-order scattered waves,and the relative errors between measured values and real parameters are all below 6%.