<strong>GH4169</strong>合金拘束相关的疲劳裂纹萌生寿命

doi:10.11900/0412.1961.2022.00099

金属学报

2022, Vol. 58

Issue (12): 1633-1644 DOI: 10.11900/0412.1961.2022.00099

研究论文

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GH4169合金拘束相关的疲劳裂纹萌生寿命

郭昊函¹, 杨杰¹(

), 刘芳², 卢荣生³

^1.上海理工大学能源与动力工程学院上海 200093
^2.上海理工大学机械工程学院上海 200093
^3.华东理工大学承压系统与安全教育部重点实验室上海 200237

Constraint Related Fatigue Crack Initiation Life of GH4169 Superalloy

GUO Haohan¹, YANG Jie¹(

), LIU Fang², LU Rongsheng³

^1.School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
^2.School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
^3.Key Laboratory of Pressure Systems and Safety, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China

引用本文:

郭昊函, 杨杰, 刘芳, 卢荣生. GH4169合金拘束相关的疲劳裂纹萌生寿命[J]. 金属学报, 2022, 58(12): 1633-1644.
Haohan GUO, Jie YANG, Fang LIU, Rongsheng LU. Constraint Related Fatigue Crack Initiation Life of GH4169 Superalloy[J]. Acta Metall Sin, 2022, 58(12): 1633-1644.

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摘要:

以GH4169镍基高温合金为研究对象，基于低周疲劳率相关的晶体塑性本构，引入累积能量耗散和累积塑性滑移2种疲劳指示因子作为疲劳裂纹萌生判据，对不同微缺口深度和长度下的疲劳裂纹萌生寿命进行研究。并基于统一拘束参数A_p，进一步考察拘束与疲劳裂纹萌生寿命的关联。结果表明：2种疲劳指示因子均可较好地预测疲劳裂纹萌生寿命。随着微缺口深度的增加，疲劳裂纹萌生寿命逐渐减少；随着微缺口长度的增加，疲劳裂纹萌生寿命逐渐增加。在不同的微缺口深度和长度下，疲劳裂纹萌生寿命均与 $A p$ 存在线性关系。可以根据该线性关系，确定拘束相关的疲劳裂纹萌生寿命。

关键词 ：拘束, 疲劳裂纹, 萌生寿命, 晶体塑性, 累积能量耗散, 累积塑性滑移

Abstract：

Nickel-based GH4169 superalloy is used as turbine disc material in aeroengines because of its good oxidation resistance, good formability, weldability, and high strength. However, turbine disc fatigue failure will inevitably occur in onerous service environments and after a long operation time. To ensure the safety and reliability of aeroengines, the fatigue damage behavior and fatigue life of GH4169 superalloy need to be studied. Constraint is an important factor affecting the fatigue fracture behavior of materials, because changing it will impact the fatigue behavior. To achieve a long service life and high reliability of aeroengines, fatigue and constraint effects must be researched. However, there are only limited studies on the effect of constraint on fatigue crack initiation time. In this study, a crystal plasticity constitutive model based on low cycle fatigue rate correlation was applied to the GH4169 superalloy. Two fatigue indicators, namely the cumulated energy dissipation and cumulated plastic slip, were introduced as fatigue crack initiation criteria to study the fatigue crack initiation time for different micro-notch depths and lengths. In addition, the relationship between constraint and fatigue crack initiation life was further investigated using the unified constraint parameter A_p. The results showed that both cumulated energy dissipation and cumulated plastic slip can accurately predict the fatigue crack initiation time. With the increase in micro-notch depth, the fatigue crack initiation time decreased, while it increased with the increase in micro-notch length. A linear relationship between the fatigue crack initiation time and $A p$ under different micro-notch depths and lengths was observed. Based on this relationship, the constraint related to the fatigue crack initiation time can be determined.

Key words： constraint fatigue crack initiation life crystal plasticity cumulated energy dissipation cumulated plastic slip

收稿日期: 2022-03-07

ZTFLH:

TH114

基金资助:国家自然科学基金项目(51975378);上海市浦江人才计划项目(21PJD047)

作者简介: 郭昊函，男，1996年生，硕士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2022.00099 或 https://www.ams.org.cn/CN/Y2022/V58/I12/1633

图1 GH4169镍基高温合金的代表体积单元(RVE)

图2 模型加载与尺寸示意图

图3 基于3种不同网格尺寸所得到的应力-应变曲线和塑性滑移云图

图4 应变幅为0.6%时不同微缺口深度模型在循环10 cyc后的累积能量耗散

图5 累积能量耗散与循环周次间的关系

图6 应变幅为0.6%时微缺口左下角点在循环第10 cyc时的滞后回线

图7 应变幅为0.6%时不同微缺口深度模型在循环10 cyc后的累积塑性滑移

图8 累积塑性滑移与循环周次间的关系

图9 基于累积能量耗散和累积塑性滑移疲劳裂纹萌生寿命预测对比

图10 应变幅为0.6%时不同微缺口长度模型在循环10 cyc后的累积能量耗散

图11 累积能量耗散与循环周次间的关系

图12 应变幅0.6%时微缺口左下角点在循环第10 cyc后的滞后回线

图13 应变幅为0.6%时不同微缺口长度模型在循环10 cyc后的累积塑性滑移

图14 累积塑性滑移与循环周次间的关系

图15 基于累积能量耗散和累积塑性滑移疲劳裂纹萌生寿命预测对比

图16 疲劳裂纹萌生寿命与拘束间的关联

图17 所有模型疲劳裂纹萌生寿命与拘束间的关联

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