Fatigue life prediction of notched components based on energy gradient using reconstructed critical distance theory

IF 3.1 2区 材料科学 Q2 ENGINEERING, MECHANICAL
Jumei Lu, Jianhui Liu, Fei Zhou, Xuemei Pan, Wenjun Kou, Youtang Li, Shengchuan Wu
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引用次数: 0

Abstract

In this paper, a reasonable explanation is given to unify notch effect and geometric size effect into notch geometric feature effect (NGFE), and energy gradient is utilized to depict the influence of the NGFE on the critical distance. The correlation of energy gradient with critical distance and fatigue life is discussed respectively. The weight index of the high energy region is used to quantify the contribution of the high energy region to the fatigue damage. Finally, a model of the reconstructed critical distance theory considering the geometric notch characteristic effect is established. The fatigue test of Q355 (D) alloy steel notched components was carried out, and the evaluation precision of the presented method is compared with Yang’ model and Shen’ model combining with the existing fatigue test data of En8. The results indicate that prediction results of the proposed method are consistent with the test results.

利用重构临界距离理论,基于能量梯度预测缺口部件的疲劳寿命
本文给出了合理的解释,将缺口效应和几何尺寸效应统一为缺口几何特征效应(NGFE),并利用能量梯度来描述 NGFE 对临界距离的影响。分别讨论了能量梯度与临界距离和疲劳寿命的相关性。高能量区域的权重指数用于量化高能量区域对疲劳损伤的贡献。最后,建立了考虑几何缺口特征效应的重构临界距离理论模型。对 Q355 (D) 合金钢缺口部件进行了疲劳试验,并结合 En8 的现有疲劳试验数据,将所提出方法的评估精度与杨氏模型和沈氏模型进行了比较。结果表明,所提方法的预测结果与试验结果一致。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
6.30
自引率
18.90%
发文量
256
审稿时长
4 months
期刊介绍: Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.
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