Effect of Strain Gradients on Fatigue Life of C-Mn Steel Notched Tubes Under Axial and Torsion Loads: Tests and Analyses

IF 3.1 2区材料科学 Q2 ENGINEERING, MECHANICAL

Fatigue & Fracture of Engineering Materials & Structures Pub Date : 2025-01-15 DOI:10.1111/ffe.14570

Shreebanta Kumar Jena, Punit Arora, Suneel K. Gupta, J. Chattopadhyay

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Abstract

Present study aims to investigate individual effects of strain gradient and peak equivalent strain amplitude on fatigue life of notched tubes of C-Mn steel. Remote pure axial and pure torsion strain-controlled tests have been performed for different strain gradients (owing to different hole diameter in tube specimen) subjected to same peak equivalent strain amplitude at hole tip. During the tests, local strains ahead of notch were measured using digital image correlation/strain gauge techniques. Measured strains have been compared with simulated strains using detailed finite element analyses. Additionally, fatigue life assessment has also been carried out using equivalent strain amplitude at (i) peak strain location and (ii) different distances from peak strain location. A critical distance parameter (d_c), in present study, has been deduced based on least scatter between predicted and test fatigue lives.

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应变梯度对轴向和扭转载荷下C-Mn钢缺口管疲劳寿命的影响：试验与分析

本研究旨在探讨应变梯度和峰值等效应变幅对C-Mn钢缺口管疲劳寿命的个别影响。在相同的孔尖等效应变峰值下，对不同应变梯度（由于管样孔直径不同）进行了远程纯轴向和纯扭转应变控制试验。在测试过程中，使用数字图像相关/应变计技术测量缺口前的局部应变。通过详细的有限元分析，将实测应变与模拟应变进行了比较。此外，还使用(i)峰值应变位置和（ii）距离峰值应变位置不同距离处的等效应变幅值进行了疲劳寿命评估。本文基于预测疲劳寿命与试验疲劳寿命的最小离散，推导出临界距离参数dc。

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

Fatigue & Fracture of Engineering Materials & Structures 工程技术-材料科学：综合

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.