Evaluation of fatigue crack initiation and propagation properties of structural steels with different cyclic softening behavior based on local strain

IF 1.6 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Isij International Pub Date : 2024-05-29 DOI:10.2355/isijinternational.isijint-2024-124

Takayuki Yonezawa, Pengjun Luo, Seiichiro Tsutsumi

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Abstract

In this paper, fatigue crack initiation and propagation properties of three structural steels with different static strength and cyclic softening behavior were evaluated and compared with the estimation results based on the local strain response. Steel C had the highest cyclic softening rate, which was 10 times that of steel A and twice that of steel B. The relationship between strain range and fatigue life in the fatigue life region shorter than 10^5 cycles was almost the same regardless of the test steels. The fatigue crack initiation life from the notch bottom of the SENT specimen was almost the same independent of static strength and cyclic softening rate. The crack initiation life estimated from the Strain range versus fatigue life equation using the local strain response measured by DIC was roughly in agreement with the experimental results. Steel C had the highest crack opening load and the slowest fatigue crack propagation rate compared to the other two steels. The local strain range at the fatigue crack tip showed a good correlation with the fatigue crack propagation rate irrespective of the steel grade. In addition, the estimates of fatigue crack propagation rate based on the local strain response were in almost agreement with the experimental results.

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基于局部应变评估具有不同循环软化行为的结构钢的疲劳裂纹萌发和扩展特性

本文评估了三种具有不同静态强度和循环软化行为的结构钢的疲劳裂纹萌发和扩展特性，并与基于局部应变响应的估算结果进行了比较。钢 C 的循环软化率最高，是钢 A 的 10 倍，是钢 B 的 2 倍。从 SENT 试样槽口底部开始的疲劳裂纹起始寿命几乎相同，与静态强度和循环软化率无关。利用 DIC 测量的局部应变响应，通过应变范围与疲劳寿命方程估算出的裂纹起始寿命与实验结果基本一致。与其他两种钢材相比，C 钢的裂纹开裂载荷最大，疲劳裂纹扩展速度最慢。疲劳裂纹顶端的局部应变范围与疲劳裂纹扩展速率有很好的相关性，而与钢种无关。此外，根据局部应变响应估算的疲劳裂纹扩展速率与实验结果基本一致。

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

Isij International 工程技术-冶金工程

CiteScore

3.40

自引率

16.70%

发文量

268

审稿时长

2.6 months

期刊介绍： The journal provides an international medium for the publication of fundamental and technological aspects of the properties, structure, characterization and modeling, processing, fabrication, and environmental issues of iron and steel, along with related engineering materials.