【摘要】 研究了 Ｆｅ－Ｍｏ－Ｓｉ－Ｂ非晶薄带在单轴拉伸加载下的动态断裂行为发现了裂纹扩展过程中的裂纹分叉和应力波致裂现象．当裂纹尖端的应力强度因子达到临界值 ＫＩＢ＝３５ ＭＰａ·ｍ１／２时，发生裂纹分叉，对应的静态平面应变断裂韧性为１６ ＭＰａ·ｍ１／２．分析认为裂纹分叉是应力波致裂发生的必要条件．更多还原

【Abstract】 Dynamic fracture characteristics have been observed and interpreted for Fe-Mo-Si-B amorphous alloy ribbon. Crack branching and stress wave induced cracking are the main features of dynamic fracture. Branching of main crack occurs when the crack tip intensity factor reaches the critical value KIB=35 Mpa·m1/2, and the corresponding plane strain fracture toughness KIC=16 MPa.m1/2. It is deduced that crack branching is the necessary condition for generation of compressive longitudinal wave. Stress wave induced cracking occurs when the amplitude of reflected compressive longitudinal wave reaches the tensile strength.更多还原