Short-Time Procedure for the Determination of Woehler and Fatigue Life Curves Using Mechanical, Thermal and Electrical Data
Short-Time Procedure for the Determination of Woehler and Fatigue Life Curves Using Mechanical, Thermal and Electrical Data
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使用机械、热和电气数据确定维勒和疲劳寿命曲线的短时程序
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
D. Eifler
中科院分区：
文献类型：
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作者：
F. Walther;D. Eifler
进行机械应力-应变滞后、温度和电阻测量以表征疲劳行为并计算金属在恒定振幅载荷和随机载荷下的寿命。在随机载荷试验中定期插入恒定振幅序列，以测量塑性应变振幅以及变形引起的试样温度和电阻的变化。绘制这些数据与随机载荷下疲劳评估循环次数的关系图，与常幅载荷下的通常做法类似。基于Morrow方程和Basquin方程的推广形式，提出了一种适用于机械、热、电测量技术的基于物理的疲劳寿命计算方法“PHYBAL”。这种新的短时间程序仅需要三次疲劳测试的数据，即可快速且精确地确定等幅载荷的Woehler曲线或随机载荷的疲劳寿命曲线。
Mechanical stress-strain hysteresis, temperature and electrical resistance measurements were performed to characterize the fatigue behavior and to calculate the lifetime of metals under constant amplitude loading and random loading. Constant amplitude sequences were periodically inserted in random load tests to measure the plastic strain amplitude as well as the deformation-induced changes in specimen temperature and electrical resistance. These data are plotted versus the number of cycles for the fatigue assessment under random loading, similar as commonly practiced under constant amplitude loading. On the basis of Morrow and Basquin equations in generalized formulations, to be applicable for mechanical, thermal and electrical measurement techniques, a physically based fatigue life calculation method “PHYBAL” was developed. This new short-time procedure requires data of only three fatigue tests for a rapid and nevertheless precise determination of Woehler curves for constant amplitude loading or fatigue life curves for random loading.