Effect of forming strain on low cycle, high cycle and notch fatigue performance of automotive grade dual phase steels: A review

IF 3.2 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Forces in mechanics Pub Date : 2023-05-01 DOI:10.1016/j.finmec.2023.100184

Surajit Kumar Paul

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引用次数: 7

Abstract

In many engineering structural applications, including car body structures, sheet metal formed components are used. A systematic investigation of the impact of forming strain on fatigue life is necessary for an accurate prediction of a formed component's fatigue life. The present work aims to determine the impact of diverse types of tensile pre-straining on high cycle fatigue (HCF), low cycle fatigue (LCF) and notch fatigue performance of automotive grade dual phase steels. In all examined pre-straining conditions, HCF life improves, LCF life deteriorates, and little change in notch fatigue life are observed. The most significant improvement in HCF life and deterioration in LCF life are observed for equi-biaxial and orthogonal tensile pre-straining conditions due to the rotation of maximum shear stress plane and the rotation of the deformation concentrated region around the hard martensite. As the strength improves during pre-straining, there is a corresponding increase in stress concentration around a notch, and as a result, no significant change in notch fatigue life is observed.

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成形应变对汽车级双相钢低周、高周和缺口疲劳性能的影响

在许多工程结构应用中，包括车身结构，都使用钣金成形部件。系统地研究成形应变对疲劳寿命的影响是准确预测成形件疲劳寿命的必要条件。本文旨在确定不同类型的拉伸预应变对汽车级双相钢高周疲劳(HCF)、低周疲劳(LCF)和缺口疲劳性能的影响。在所有测试的预应变条件下，HCF寿命提高，LCF寿命下降，缺口疲劳寿命变化不大。在等双轴和正交拉伸预应变条件下，由于最大剪应力平面的旋转和硬马氏体周围变形集中区域的旋转，HCF寿命的提高和LCF寿命的下降最为显著。随着预应变强度的提高，缺口周围的应力集中也相应增加，因此缺口的疲劳寿命没有明显变化。

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