一、前言材料在动载情况下的韧脆性能是衡量材料好坏的重要指标之一。而评定动态韧性的实验方法从缺口冲击试验开始,七十多年夹又发展了落锤试验、止裂温度试验等。缺口冲击试验虽然存在一些问题,但由于其设备单纯、方法简便、耗费试验材料少,所以至今仍为人们所 I. Preface The ductile and brittle performance of materials under dynamic loading is one of the important indexes to measure the quality of materials. The experimental method of assessing the dynamic toughness from the notched impact test began, 70 years and then developed a folder drop hammer test, crack stop temperature test. Notch impact test although there are some problems, but because of its simple equipment, the method is simple, less test material, so it is still people