China Mechanical Engineering ›› 2025, Vol. 36 ›› Issue (8): 1740-1748.DOI: 10.3969/j.issn.1004-132X.2025.08.009

Previous Articles    

Fatigue Cumulative Damage Model Considering Dynamic Memory Properties of Materials

Sizhu ZHOU(), Qiongyao XIANG, Yun ZENG()   

  1. School of Mechanical Engineering,Yangtze University,Jingzhou,Hubei,434020
  • Received:2024-03-15 Online:2025-08-25 Published:2025-09-18
  • Contact: Yun ZENG

考虑材料动态记忆特性的疲劳累积损伤模型

周思柱(), 向琼垚, 曾云()   

  1. 长江大学机械工程学院, 荆州, 434020
  • 通讯作者: 曾云
  • 作者简介:周思柱,男,1963 年生,教授、博士。研究方向为石油机械现代设计技术与方法。zhsz@yangtzeu.edu.cn
    曾 云*(通信作者),男,1991 年生,副教授、博士。研究方向为压裂装备结构强度可靠性。E-mail:mechanicszy@163.com
  • 基金资助:
    国家自然科学基金(52174018)

Abstract:

In order to evaluate the fatigue life of engineering components under variable amplitude loads and improve the prediction accuracy of fatigue life, based on the S⁃N curve, a new form of material memory performance function was introduced and a new fatigue cumulative damage model was established considering the damages and irreversible degradation caused by grain boundary cracking, slip extrusion and extrusion in the materials caused by cyclic loads. A two-stage loading tests were carried out on the pump head bodies of 30NiCrMoV12 and 30CrMnSiA to verify the accuracy of the model proposed herein for fatigue life prediction. The results show that the fatigue cumulative damage model considering the dynamic memory characteristics of the materials is compared with other models. The fatigue life prediction results under high-low two-stage loading conditions are within the error band of 1.5 times, and the mean prediction error is less than 0.1, which has higher prediction accuracy.

Key words: material memory property, fatigue life prediction, fatigue cumulative damage, S-N curve

摘要:

为了评估工程构件在变幅载荷下的疲劳寿命,提高疲劳寿命的预测精度,以应力-寿命曲线(S⁃N曲线)为基础,考虑工程结构件承受循环载荷导致材料内部晶界开裂、滑移挤入、挤出引起的损伤和不可逆退化,引入了一种新形式的材料记忆性能函数,建立了一种新型疲劳累积损伤模型。采用30NiCrMoV12和30CrMnSiA两种材料的泵头体进行两级加载试验,以验证所提模型对疲劳寿命预测的准确性。结果表明:考虑材料动态记忆特性的疲劳累积损伤模型与其他模型相比,在高-低两级加载工况下的疲劳寿命预测结果在1.5倍的误差带内,预测误差均值小于0.1,具有较高的预测精度。

关键词: 材料记忆性能, 疲劳寿命预测, 疲劳累积损伤, 应力-寿命曲线

CLC Number: