Charpy裂纹试样的启裂点确定与动态断裂韧性  

CRACK INITIATION POINT DETERMINATION AND DYNAMIC FRACTURE TOUGHNESS FOR CHARPY PRE-CRACKED SPECIMEN

作　　者：林君山[1] 鄢文彬[1] 涂铭旌[1] 

机构地区：[1]西安交通大学

出　　处：《金属学报》1992年第4期A170-A175,共6页Acta Metallurgica Sinica

摘　　要：本文研究了用应变片测定Charpy裂纹试样动态断裂启裂点的方法,在不同的试验温度下,用双通道高速采样磁盘存储示波器同时测定了冲击试样的P—t曲线和裂纹尖端区域的名义ε—t曲线,结合动态有限元对Charpy裂纹试样冲击过程的模拟结果,分析了动态断裂韧性的测定方法,并指出了以往动态断裂韧性测定中存在的问题。The method to detect the crack initiation point of Charpy pre-cracked specimen under dynamic loading was studied using strain gauge. The load-time curve and nominal strain-time curve at the crack tip for impact testing specimens may be simultaneously measured by twin-channel oscilloscope with high speed sampling and diskette storing. Based on the dy- namic finite element simulation of impact response of Charpy specimen, the measuring method of dynamic fracture toughness was analysed and some problems in previous dynamic fracture toughness measurement were discussed.

关 键 词：启裂点 应变片 动态 断裂韧性 

分 类 号：TG111.91[金属学及工艺—物理冶金]