多次冲击(国外称重复冲击)试验方法开展已有近八十年历史,国内进行这种试验也有近三十年历史。但各国的试验机型号不一,试样的几何形状与尺寸各异,至今尚未建立统一的试验方法准则。这就给试验工作带来诸多不便。然而材料机械性能常规试验有其众所周知的一般准则,就是试验数据重复性好。试样必须断裂在有效部位,这样的数据才认为可靠。本文只讨论多冲光滑试样的断裂部位问题,因为它有普遍性,在多冲试验过程里是经常出现的。国内许多文献提供的试样尺寸及几何形状见图1。这种试样已经沿用多年,对它提 Repeated impact (repeated weighing shock abroad) test method to carry out nearly eight decades of history, the domestic test for nearly 30 years of history. However, the test machine models vary from one country to another, and the geometric shapes and sizes of the test pieces vary. So far, no unified test method standard has been established. This brings a lot of inconvenience to the experimental work. However, the conventional mechanical testing of materials has its well-known general guideline that the test data is reproducible. The specimen must be broken in the active area, so that the data is considered reliable. This article only discusses the problem of rupture of a multi-blasted specimen because of its pervasiveness, which often occurs during multi-shot tests. Many domestic literature sample size and geometry shown in Figure 1. This sample has been used for many years, mention it