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Accuracy of the predicting for creep-fatigue cyclic life based on parameters in a characteristic cycle
Engineering Fracture Mechanics ( IF 5.4 ) Pub Date : 2021-08-14 , DOI: 10.1016/j.engfracmech.2021.107955
Biao Ding 1 , Weili Ren 1 , Yunbo Zhong 1 , Xiaotan Yuan 1 , Jianchao Peng 2 , Tianxiang Zheng 1 , Zhe Shen 1 , Yifeng Guo 1 , Weidong Xuan 1 , Jianbo Yu 1 , Josip Brnic 3 , Peter K. Liaw 4
Affiliation  

The purposes of the present work are to evaluate the prediction accuracy of characteristic cycle on creep-fatigue life prediction and to analyze the advantages and disadvantages of various models in tensile strain-dwell tests. The parameters of the first cycle, the 10% life, the half-life, and the characteristic cycle that we proposed (a turning point between the initial rapid softening and subsequent slight softening/hardening) are employed to linear-damage-summation (LDS) and energy-life prediction models based on the creep-fatigue data of directionally-solidified Nickel-based superalloy, DZ445, at 900 °C. It is found that the characteristic cycle parameters with clear physical significance have the highest life prediction accuracy. Moreover, the optimal critical value of fatigue and creep damage (the coordinate of the creep-fatigue envelope intersection) in the LDS is also determined. The prediction accuracy of creep damage based on the time-fraction, the simple ductility-exhaustion, and the strain-energy- density-exhaustion models is sequentially improved in the LDS rule. In the energy-life model, the life prediction accuracy based on damage mechanism and frequency correction is higher than the value without any correction. This investigation provides a new method of the parameter-selection for the creep-fatigue life prediction, which is accurate and convenient. It provides the theoretical-guidance for creep-fatigue life prediction in both laboratory experiment and actual components.



中文翻译:

基于特征循环参数的蠕变-疲劳循环寿命预测精度

本工作的目的是评估特征循环对蠕变疲劳寿命预测的预测精度,并分析各种模型在拉伸应变保持试验中的优缺点。将第一次循环、10% 寿命、半衰期和我们提出的特征循环(初始快速软化和随后轻微软化/硬化之间的转折点)的参数用于线性损伤求和(LDS) ) 和基于定向凝固镍基高温合金 DZ445 在 900 °C 下的蠕变疲劳数据的能量寿命预测模型。发现物理意义明确的特征循环参数寿命预测精度最高。而且,还确定了 LDS 中疲劳和蠕变损伤的最佳临界值(蠕变-疲劳包络相交的坐标)。LDS规则依次提高了基于时间分数、简单延性-耗竭和应变-能量-密度-耗竭模型的蠕变损伤预测精度。在能量-寿命模型中,基于损伤机理和频率修正的寿命预测精度高于未进行任何修正的值。本研究为蠕变疲劳寿命预测提供了一种新的参数选择方法,该方法准确、方便。它为实验室实验和实际部件的蠕变疲劳寿命预测提供了理论指导。LDS规则依次提高了基于时间分数、简单延性-耗竭和应变-能量-密度-耗竭模型的蠕变损伤预测精度。在能量-寿命模型中,基于损伤机理和频率修正的寿命预测精度高于未进行任何修正的值。本研究为蠕变疲劳寿命预测提供了一种新的参数选择方法,该方法准确、方便。它为实验室实验和实际部件的蠕变疲劳寿命预测提供了理论指导。LDS规则依次提高了基于时间分数、简单延性-耗竭和应变-能量-密度-耗竭模型的蠕变损伤预测精度。在能量-寿命模型中,基于损伤机理和频率修正的寿命预测精度高于未进行任何修正的值。本研究为蠕变疲劳寿命预测提供了一种新的参数选择方法,该方法准确、方便。它为实验室实验和实际部件的蠕变疲劳寿命预测提供了理论指导。基于损伤机理和频率修正的寿命预测精度高于未作任何修正的值。本研究为蠕变疲劳寿命预测提供了一种新的参数选择方法,该方法准确、方便。它为实验室实验和实际部件的蠕变疲劳寿命预测提供了理论指导。基于损伤机理和频率修正的寿命预测精度高于未作任何修正的值。本研究为蠕变疲劳寿命预测提供了一种新的参数选择方法,该方法准确、方便。它为实验室实验和实际部件的蠕变疲劳寿命预测提供了理论指导。

更新日期:2021-08-19
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