Proposing a New Crack Driving Force Parameter for Fatigue Crack Growth Rate of C–Mn Steel

IF 3.1 2区材料科学 Q2 ENGINEERING, MECHANICAL

Fatigue & Fracture of Engineering Materials & Structures Pub Date : 2025-01-25 DOI:10.1111/ffe.14585

Prakash Bharadwaj, Suneel K. Gupta, Punit Arora, J. Chattopadhyay

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引用次数: 0

Abstract

The present study is aimed at analyzing the fatigue crack growth rate data on compact tension (CT) and three-point-bend (TPB) specimens of C–Mn steel under different positive load ratios. Detailed elastic–plastic finite element analyses have been performed using nonlinear kinematic hardening rule of Chaboche material model. The numerically calculated plastic zone ahead of crack tip has been compared with measured plastic zone using digital image correlation technique. The fatigue crack growth rate curves have been analyzed with respect to different crack driving forces such as (i) single-parameter stress intensity factor (SIF) range, (ii) two-parameter-based SIF ( $K^{*}$ ), and (iii) cyclic plasticity zone–based models. A new crack driving force has been proposed considering cyclic plastic zone and representative plastic strain accumulation within this zone. The $K^{*}$ parameter and proposed model resulted in improved assessments for different load ratios and constraint geometries (CT and TPB).

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提出一种新的C-Mn钢疲劳裂纹扩展速率裂纹驱动力参数

本研究旨在分析C-Mn钢在不同正载荷比下的致密拉伸（CT）和三点弯曲（TPB）试样的疲劳裂纹扩展速率数据。采用Chaboche材料模型的非线性运动硬化规律进行了详细的弹塑性有限元分析。利用数字图像相关技术，将数值计算得到的裂纹尖端前塑性区与实测塑性区进行了比较。针对不同的裂纹驱动因素（i)单参数应力强度因子（SIF）范围、（ii）基于双参数应力强度因子（K * $$ {K}^{\ast } $$）和（iii）基于循环塑性区模型），分析了疲劳裂纹扩展速率曲线。考虑循环塑性区和循环塑性区内具有代表性的塑性应变积累，提出了一种新的裂纹驱动力。K * $$ {K}^{\ast } $$参数和提出的模型改进了对不同载荷比和约束几何形状（CT和TPB）的评估。

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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.