热疲劳损伤的超声无损评价  

Ultrasonic Evaluation of Thermal Fatigue Damage

作　　者：谭家隆[1] 陈永昌[1] 

机构地区：[1]大连理工大学材料科学与工程学院,辽宁大连116024

出　　处：《无损检测》2008年第7期441-443,共3页Nondestructive Testing

摘　　要：传统的热疲劳损伤检测方法大多是破坏性的。引入超声无损评价的方法,通过测量经过不同热疲劳周次的试样中的纵波和横波声速,根据弹性模量与超声波在试样中声速的关系,得到试样的弹性模量E和不同损伤试样的有效弹性模量~E,进而得到损伤变量D,从而实现对试样热疲劳损伤的超声无损评价。实验条件下,当热疲劳达到300次时,损伤变量D=0.1,基本实现了预期测试目标。Traditional ways to evaluate the damage caused by thermal fatigue are almost destructive.According to the relationship between E and velocity of sound wave,a nondestructive testing method measuring velocity in different specimens of different thermal fatigue times was proposed.When Young s modulus E and effective modulus of elasticity were got,then the damage parameter D was available,and hence ultrasonic testing of thermal fatigue damage could be achieved.Under this experimental condition,damage parameter ...

关 键 词：超声检测 热疲劳 弹性模量 损伤变量 

分 类 号：TG115.285[金属学及工艺—物理冶金]