Ultrasonic Evaluation of Thermal Fatigue Damage
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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,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。Abstract: 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 Youngs 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.
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Keywords:
- Ultrasonic testing /
- Thermal fatigue /
- Youngs modulus /
- Damage parameter
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