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对转子锻件中的方向性缺陷如位于中心孔边缘的裂纹类危险缺陷,如采用常规探头,则无法发现,更谈不到测知其当量大小。本文介绍的是发现这种方向性缺陷的方法并通过试验导出其定量结果。一、小角度探头设计原理当纵波入射角小于27.3°(第一临界角)时,第二介质中存在折射的纵横两种波型L_2和S_2。小角度探头就是利用折射纵波L_2。而折射横波S_2则由于波速约等于纵波的一半以及能量较低,即使在第二介质中同时并存,也不致于干扰缺陷的判断。故从小角度探头的应用实质来看,其名称应叫做小角度纵波直探头。而其使用的方法应叫做小角度纵波直探头探伤法。
Directional defects in the rotor forgings such as cracks located at the edge of the center hole dangerous defects, such as the use of conventional probes, you can not find, let alone measure its equivalent size. This article describes a method for discovering such directional defects and derives its quantitative results through experiments. First, the design principle of a small angle probe When the longitudinal wave incident angle is less than 27.3 ° (the first critical angle), the second medium there are two modes of refraction of vertical and horizontal L_2 and S_2. Small angle probe is the use of refraction longitudinal wave L_2. The refracted transverse S_2, however, will not interfere with the determination of defects due to the fact that the wave velocity is approximately equal to one-half of the longitudinal wave and the energy is low, even if it co-exists in the second medium. Therefore, the application of the probe from a small point of view, the name should be called a small angle longitudinal wave straight probe. The method used should be called a small angle longitudinal wave straight probe flaw detection method.