China Mechanical Engineering ›› 2024, Vol. 35 ›› Issue (12): 2259-2267.DOI: 10.3969/j.issn.1004-132X.2024.12.019

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Research on Low Cycle Fatigue Response and Life Prediction Improvement Method of 316 Stainless Steels

LI Muheng;FAN Haigui;YANG Bin;WU Dongxiao   

  1. College of Chemical Engineering,Dalian University of Technology,Dalian,Liaoning,116024

  • Online:2024-12-25 Published:2025-01-17

316不锈钢低周疲劳响应与寿命预测改进方法研究

李牧衡;范海贵;杨斌;吴东晓   

  1. 大连理工大学化工学院,大连,116024
  • 作者简介:李牧衡,男,1999年生,硕士研究生。研究方向为金属材料低周疲劳。E-mail:13419327062@163.com。
  • 基金资助:
    国家重点研发计划(2020YFA0714402);中央高校基本科研业务费专项资金(DUT22LAB604)

Abstract: Based on the fatigue experimental data in the literature at 0.4%, 0.8% and 1.0% strain amplitude, the relationship among hardening parameters and strain amplitudes was systematically investigated, and the fitted curves of hardening parameters with respect to strain amplitude were obtained. A finite element model was established to reflect the fatigue cycle hysteresis curves, peak stress evolution curves and damage evolution curves. Through numerical simulation combined with the Manson-Coffin equation, fatigue life prediction was carried out at 0.5%, 0.7%, 0.9%, and 1.2% strain amplitudes respectively. Low cycle fatigue experiments were conducted on 316 stainless steels under strain amplitudes of 0.9% and 1.2%, and the life prediction results were verified. The results indicate that the predicted fatigue response processes are highly consistent with the experimental results, the life prediction error under 0.9% strain amplitude is as 21.1%, and the error under 1.2% strain amplitude is as 5.3%, which proves the accuracy of the fatigue response and life prediction improvement method. 

Key words: low cycle fatigue, life prediction, hardening parameter fitting, 316 stainless steel

摘要: 基于文献中0.4%、0.8%、1.0%应变幅下疲劳实验数据,对硬化参数与应变幅之间的关系进行了系统研究,得到了硬化参数关于应变幅的拟合曲线。建立了能够反映疲劳循环滞回曲线、峰值应力演化曲线和损伤演化曲线的有限元模型,通过数值模拟结合Manson-Coffin方程分别进行了0.5%、0.7%、0.9%、1.2%应变幅下疲劳寿命预测。开展了0.9%和1.2%应变幅下316不锈钢低周疲劳实验,对寿命预测结果进行了验证。研究结果表明,所预测的疲劳响应过程与实验结果吻合度较高,0.9%应变幅下寿命预测误差为21.1%,1.2%应变幅下误差为5.3%,证明了提出的疲劳响应与寿命预测改进方法的准确性。

关键词: 低周疲劳, 寿命预测, 硬化参数拟合, 316不锈钢

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