王颢然,张伟伟,王闯,赵子龙

• 1:太原科技大学应科学院力学系

摘要(Abstract)：

基于非线性超声检测技术提出了一种适用于钢轨接头螺孔裂纹的检测方法。由于轨道截面为异形截面，这将导致在其中传播的应力波具有非线性特征。通过有限元分析和实验研究验证了钢轨截面中传播的超声波存在有二次谐波以及利用二次谐波检测钢轨接头螺孔裂纹的有效性，获得了非线性参数随裂纹深度逐渐增加时的变化规律。结果表明，基于二次谐波幅构造的非线性参数随损伤程度的变化具有线性递减的规律，验证了该非线性参数用于识别孔边裂纹的有效性，同时也为评估钢轨接头螺孔裂纹的大小提供了参考。

关键词(KeyWords)： 重载铁路;螺孔裂纹;实验研究;非线性超声;二次谐波

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(11872261);; 山西省自然科学基金(201801D121012);; 晋城科技预研项目(20198035)

作者(Author): 王颢然,张伟伟,王闯,赵子龙

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