An energy-based low-cycle fatigue life evaluation method considering anisotropy of single crystal superalloys

IF 5.4 2区工程技术 Q1 ENGINEERING, AEROSPACE Propulsion and Power Research Pub Date : 2022-06-01 DOI:10.1016/j.jppr.2022.03.004

Tianxiao Sui, Duoqi Shi, Yongsheng Fan, Zhenlei Li, Xiaoguang Yang

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引用次数: 3

Abstract

The crystal orientation significantly affects the low-cycle fatigue (LCF) properties of single crystal (SC) superalloys. However, the orientation-dependent LCF life model with precise mechanisms and strong applicability is still lacking. This investigation aims at establishing an energy-based LCF life evaluation method that could consider the orientation effect. First, the influencing factors of anisotropy were identified through the literature review. Secondly, the multiaxial formula of the Ramberg-Osgood (R–O) equation was established to describe the anisotropic cyclic deformation characteristics. Furthermore, the strain energy density of SC superalloys was determined based on this equation, and the effective strain energy density was introduced to account for the effect of orientation. Finally, the energy-based method was validated by its application to several SC superalloys. Results showed that the crystallographic orientation with a lower Young's modulus usually exhibits better LCF resistance. This phenomenon could be attributed to the different values of strain energy density dissipated in one cycle. The multiaxial R–O relationship could capture the anisotropic cyclic deformation response of DD6. Compared with the classical methods, the energy-based model is favored by its precise mechanism and strong applicability. And it also exhibited better prediction accuracy. Most data points of different crystallographic orientations lay within the ±3 error band.

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考虑单晶高温合金各向异性的基于能量的低周疲劳寿命评价方法

晶体取向对单晶高温合金的低周疲劳性能有显著影响。然而，目前还缺乏一个机制精确、适用性强的基于方位的LCF寿命模型。本研究旨在建立一种考虑取向效应的基于能量的LCF寿命评价方法。首先，通过文献综述找出各向异性的影响因素。其次，建立了描述各向异性循环变形特征的Ramberg-Osgood (R-O)方程的多轴公式;在此基础上确定了SC高温合金的应变能密度，并引入了考虑取向影响的有效应变能密度。最后，将能量法应用于几种SC高温合金，验证了该方法的有效性。结果表明，杨氏模量较低的晶体取向通常具有较好的抗LCF性能。这种现象可归因于在一个循环中耗散的应变能密度值不同。多轴R-O关系可以反映DD6的各向异性循环变形响应。与经典方法相比，基于能量的模型具有机理精确、适用性强等优点。同时也表现出较好的预测精度。不同结晶取向的数据点大多在±3的误差范围内。

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来源期刊

Propulsion and Power Research Multiple-

CiteScore

7.50

自引率

5.70%

发文量

期刊介绍： Propulsion and Power Research is a peer reviewed scientific journal in English established in 2012. The Journals publishes high quality original research articles and general reviews in fundamental research aspects of aeronautics/astronautics propulsion and power engineering, including, but not limited to, system, fluid mechanics, heat transfer, combustion, vibration and acoustics, solid mechanics and dynamics, control and so on. The journal serves as a platform for academic exchange by experts, scholars and researchers in these fields.