局所ひずみに基づく繰返し軟化特性の異なる構造用鋼の疲労亀裂発生・伝播特性評価

IF 0.3 4区材料科学 Q4 METALLURGY & METALLURGICAL ENGINEERING Tetsu To Hagane-journal of The Iron and Steel Institute of Japan Pub Date : 2023-01-01 DOI:10.2355/tetsutohagane.tetsu-2023-088

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 105 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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基于局部形变的重复软化特性的不同结构用钢的疲劳龟裂发生和传播特性评价

对具有不同静强度和循环软化性能的三种结构钢的疲劳裂纹萌生和扩展特性进行了评价，并与基于局部应变响应的估计结果进行了比较。C钢的循环软化率最高，是A钢的10倍，是b钢的2倍。在小于105次循环的疲劳寿命区域，应变范围与疲劳寿命之间的关系几乎相同。从试件缺口底部开始的疲劳裂纹起裂寿命与静强度和循环软化速率无关。利用DIC测量的局部应变响应，由应变范围-疲劳寿命方程估算出的裂纹起裂寿命与实验结果基本吻合。与其他两种钢相比，C钢具有最高的裂纹张开载荷和最慢的疲劳裂纹扩展速率。疲劳裂纹尖端的局部应变范围与疲劳裂纹扩展速率具有良好的相关性，与钢的等级无关。此外，基于局部应变响应的疲劳裂纹扩展速率估计与实验结果基本一致。

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来源期刊

Tetsu To Hagane-journal of The Iron and Steel Institute of Japan 工程技术-冶金工程

CiteScore

0.70

自引率

33.30%

发文量

审稿时长

6-12 weeks

期刊介绍： The journal ISIJ International first appeared in 1961 under the title Tetsu-to-Hagané Overseas. The title was changed in 1966 to Transactions of The Iron and Steel Institute of Japan and again in 1989 to the current ISIJ International. 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. Classification I Fundamentals of High Temperature Processes II Ironmaking III Steelmaking IV Casting and Solidification V Instrumentation, Control, and System Engineering VI Chemical and Physical Analysis VII Forming Processing and Thermomechanical Treatment VIII Welding and Joining IX Surface Treatment and Corrosion X Transformations and Microstructures XI Mechanical Properties XII Physical Properties XIII New Materials and Processes XIV Social and Environmental Engineering.