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，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 D was increased to 0.1 after 300 times of thermal fatigue. The result showed that the aim of testing was realized.