论文部分内容阅读
1.前言本研究是用二次谐波对铁道车轴的车轮压装部位内侧边缘附近表面上所产生的摩擦疲劳裂纹进行定量评价,并在非破坏性状态下连续观察了能检测出的最小裂纹深度极限值的能力和裂纹扩展动态的结果。这种二次谐波是一种沿表面传播、振动方向与表面平行的横波。与雷利波几乎不进入车轮压装部内的情况相反,二次谐波具有差不多在压装部内能无衰减地传播,并在压装部内的微小裂纹处能发生反射的性能,故二次谐波在检测摩擦裂纹方面是十分有效的。 2.二次谐波用探头
1. Introduction This study quantitatively evaluates the frictional fatigue cracks generated on the surface near the inner edge of the wheel pressing part of the railway axle by the second harmonic wave and continuously observes the smallest crack that can be detected in the non-destructive state The ability of depth limits and the results of crack propagation dynamics. This second harmonic is a shear wave that travels along the surface and vibrates parallel to the surface. In contrast to the case where the Raleighs hardly enter the wheel press-fitting section, the second harmonic wave can propagate almost without any attenuation in the press-fitting section and can reflect at minute cracks in the press-fitting section, so that the second harmonic Waves are very effective at detecting friction cracks. Second harmonic probe