针对传统超声波检测方法的不足, 本文提出红外热波无损检测技术检测钢轨轨脚两侧的裂纹, 在 ANSYS有限元分析软件中对钢轨轨脚裂纹红外热波无损检测实验进行了数值模拟分析, 并搭建了钢轨裂纹红外热波检测实验的实验平台, 对仿真结果进行了验证。钢轨轨底裂纹红外热波无损检测实验仿真主要包括 3部分: 建立钢轨实体模型并对其进行网格划分, 热流密度模拟热波载荷施加在钢轨轨脚表面进行求解分析, 对求解结果生成钢轨轨脚表面的温度分布云图和温度随时间变化曲线图。仿真与实验结果表明: 红外热波无损检测方法可以弥补传统超生波检测方法的不足, 可以检测得到钢轨轨底两侧的裂纹。

Aiming at the deficiency of traditional ultrasonic testing methods, in this study, infrared thermal wave nondestructive testing technology is used to detect cracks on both sides of the rail foot, and the ANSYS finite element analysis software is used to simulate the infrared thermal wave nondestructive testing of rail foot cracks. The experimental platform of infrared thermal wave detection for rail cracks is established and the simulation results are verified. The experimental simulation of infrared thermal wave nondestructive testing of rail bottom cracks mainly includes three parts: a solid model of the rail that has been set up and meshed, heat flux simulation of the thermal wave load applied to the surface of rail, and the results showing the temperature profile of the rail foot surface and the temperature change curve with time. The simulation and experimental results show that the infrared thermal wave nondestructive testing method can make up for the shortcomings of the traditional method, and can detect cracks on both sides of the rail bottom at the same time.