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钢在疲劳过程中的超声衰减

潘正良 王双全 李广义

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钢在疲劳过程中的超声衰减

潘正良, 王双全, 李广义

ULTRASONIC ATTENUATION IN STEEL DURING FATIGUE

PAN ZHENG-LIANG, WANG SHUANG-QUAN, LI GUANG-YI
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  • 测量了高强度钢的紧凑拉伸试样在疲劳过程中的10MHz超声衰减,研究了疲劳裂纹前端区域内的位错动态行为。
    The fatigue crack length a and the changes of ultrasonic attenuation △α at frequency 10 MHz 011 compact test sample of 30CrMnSiNi2A steel have been simutane-uosly measured as a function of fatigue cycle number N. It was shown that the △α(N) curve was in good response to the a(N) curve and the △α was traced out during the period of crack nucleation. The ultrasonic attenuation a as a function of load P in pulsating tension fatigue test has been investigated. When Pc, where Pc is a critical load, a decreases wth increase of the load; when P>Pc, a increases rapidly with increase of the load. A depinning model of dislocations is suggested. The ultrasonic attenuation is a very useful tool for studying the growth of fatigue crack.
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出版历程
  • 收稿日期:  1984-01-04
  • 刊出日期:  2005-05-10

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