Charpy裂纹体的冲击响应与动态断裂韧度  

IMPACT RESPONSE AND DYNAMIC FRACTURE TOUGHNESS OF CHARPY PRE-CRACKED SPECIMEN

作　　者：林君山[1] 涂铭旌[1] 鄢文彬[1] 

机构地区：[1]上海交通大学,成都科技大学,西南交通大学

出　　处：《机械工程学报》1994年第1期1-6,共6页Journal of Mechanical Engineering

摘　　要：采用动态弹塑性有限元法分析了Ｃｈａｒｐｙ裂纹试样在动态加载下的冲击响应。分析结果表明：在一般冲击实验机的加载速度下，惯性力对裂纹尖端的Ｊ积分影响不大。实际中，只要对示波冲击测得的载荷－时间曲线进行数字滤波处理，动态Ｊ积分可按准静态加载下的Ｊ积分计算公式计算。另外。the impact response of Charpy pre-cracked specimen under dynamic loading was analysed by use of elastic-elastic dynamic finite element method. Analysis results showed that the effects of inertia force on J-integral around crack tip can be ignored in the loading rate range of general impact test machine. In practice, therfore, so long as appropriate mathematic treatment was used to carry out the load-time curve, dynamic jintegral can calculated according to the J-integral formula for quasistatic loading. In addition,the experiments proved that the crack onset point of Charpy pre-crecked specimen can be satisfactorily detected by using strain gage pasted on the crack tip under impact loading.

关 键 词：有限元 冲击响应 启裂点 裂纹体 

分 类 号：TG115.57[金属学及工艺—物理冶金]