首页> 外文会议>World Conference on Titanium v.3; 20030713-20030718; Hamburg; DE >Thermographic Characterization of Fatigue Damage in Ti-6Al-4V
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Thermographic Characterization of Fatigue Damage in Ti-6Al-4V

机译:Ti-6Al-4V疲劳损伤的热像学表征

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Cyclic mechanical loading generates heat due to microplastic deformations internal friction, and non-adiabatic thermoelastic effects. These effects may change the specimen temperature during cyclic loading. Typically, this is avoided by low loading frequencies in fatigue experiments. However, such thermal effects are very sensitive to the mechanical properties and microstructure changes of the material and can be useful for detecting the evolution of internal damage. The current study discusses the development of a new thermal parameter that can be used to characterize the fatigue damage state from the heat generated per loading cycle. The thermal parameter was measured during the short-term (5 seconds) cyclic loading as a function of fatigue life for Ti-6Al-4V. The thermal parameter showed a linear increase with accumulated fatigue cycles.
机译:循环机械载荷由于微塑性变形,内摩擦和非绝热热弹性效应而产生热量。这些影响可能会在循环加载过程中改变样品温度。通常,可以通过疲劳实验中的低加载频率来避免这种情况。但是,这种热效应对材料的机械性能和微观结构变化非常敏感,可用于检测内部损伤的发展。当前的研究讨论了新的热参数的发展,该参数可用于根据每个加载周期产生的热量来表征疲劳损伤状态。热参数是在短期(5秒)循环负载下测量的,作为Ti-6Al-4V疲劳寿命的函数。热参数显示出随着累积疲劳周期线性增加。

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