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Fatigue limit assessment of a 6061 aluminum alloy based on infrared thermography and steady ratcheting effect
International Journal of Minerals, Metallurgy and Materials ( IF 4.8 ) Pub Date : 2020-09-05 , DOI: 10.1007/s12613-019-1942-2
Ru-yi Feng , Wen-xian Wang , Zhi-feng Yan , Deng-hui Wang , Shi-peng Wan , Ning Shi

To quickly predict the fatigue limit of 6061 aluminum alloy, two assessment methods based on the temperature evolution and the steady ratcheting strain difference under cyclic loading, respectively, were proposed. The temperature evolutions during static and cyclic loadings were both measured by infrared thermography. Fatigue tests show that the temperature evolution was closely related to the cyclic loading, and the cyclic loading range can be divided into three sections according to the regular of temperature evolution in different section. The mechanism of temperature evolution under different cyclic loadings was also analyzed due to the thermoelastic, viscous, and thermoplastic effects. Additionally, ratcheting strain under cyclic loading was also measured, and the results show that the evolution of the ratcheting strain under cyclic loading above the fatigue limit undergone three stages: the first increasing stage, the second steady state, and the final abrupt increase stage. The fatigue limit of the 6061 aluminum alloy was quickly estimated based on transition point of linear fitting of temperature increase and the steady value of ratcheting strain difference. Besides, it is feasible and quick of the two methods by the proof of the traditional S-N curve.



中文翻译:

基于红外热成像和稳定棘轮效应的6061铝合金疲劳极限评估

为了快速预测6061铝合金的疲劳极限,提出了两种基于温度演化和循环载荷下棘轮稳态应变差的评估方法。静态和循环加载过程中的温度变化都通过红外热像仪测量。疲劳试验表明,温度的变化与循环荷载密切相关,根据不同截面的温度变化规律,可将循环荷载范围分为三部分。由于热弹性,粘性和热塑性效应,还分析了在不同循环载荷下的温度演化机理。此外,还测量了循环载荷下的棘轮应变,结果表明,在疲劳极限以上的循环载荷作用下,棘轮应变的演化经历了三个阶段:第一阶段,第二阶段稳态和最终阶段。基于温度升高线性拟合的过渡点和棘轮应变差的稳定值,可以快速估算6061铝合金的疲劳极限。另外,通过传统方法的证明,两种方法都是可行,快捷的。SN曲线。

更新日期:2020-09-06
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