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IF 2.4 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Welding in the World Pub Date : 2024-12-03 DOI:10.1007/s40194-024-01874-7

Y. Ono, H. Remes

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引用次数: 0

摘要

研究了表面完整性和局部疲劳现象对高频机械冲击（HFMI）处理焊接接头短疲劳裂纹萌生和扩展的影响。处理后的表面区域具有压缩残余应力场、光滑的缺口几何形状和加工硬化层，提高了焊接接头的疲劳强度。然而，在短裂纹萌生和扩展过程中，这些表面条件对疲劳损伤过程区的影响尚不清楚。因此，本研究系统地研究了不同表面特性对hfmi处理的高强钢焊接接头疲劳寿命建模的影响。这是通过基于裂纹扩展和弹塑性有限元模拟的非局部连续损伤力学方法来实现的，明确地模拟了处理过的表面条件。首先用实验验证了模拟疲劳寿命，然后将其应用于各种表面条件。仿真结果表明，裂纹尺寸达到0.2 mm之前，大部分疲劳寿命都在持续。压缩残余应力场大大延长了短裂纹萌生和扩展寿命，其贡献程度高度依赖于加载历史和残余应力的变化。加工硬化层的作用主要集中在提高短裂纹萌生和短裂纹扩展初期的疲劳寿命。

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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Influence of surface integrity on short crack growth behavior in HFMI-treated welded joints

This study investigates the influence of surface integrity and the localized fatigue phenomena on the initiation and propagation of short fatigue cracks in high-frequency mechanical impact (HFMI)-treated welded joints. The treated surface region, characterized by a compressive residual stress field, smooth notch geometry, and work hardening layer, improves welded joints’ fatigue strength. However, how these surface conditions influence the fatigue damage process zone during short crack initiation and growth is not yet well known. Therefore, this study systematically investigates the influence of different surface characteristics on fatigue life modeling of HFMI-treated welded joints made of high-strength steel. This is achieved using a non-local continuum damage mechanics-based approach of crack growth and elastic–plastic finite element simulation, explicitly modeling treated surface conditions. The simulated fatigue life is first verified with experiments and then applied to various surface conditions. The simulation results show that most of the fatigue life is spent until a crack size of 0.2 mm. The compressive residual stress field greatly extends both short crack initiation and propagation life, with its degree of contribution highly dependent on loading history and residual stress change. The role of the work hardening layer is mainly concentrated on improving fatigue life during short crack initiation and the very beginning of short crack growth.

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来源期刊

Welding in the World METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

4.20

自引率

14.30%

发文量

181

审稿时长

6-12 weeks

期刊介绍： The journal Welding in the World publishes authoritative papers on every aspect of materials joining, including welding, brazing, soldering, cutting, thermal spraying and allied joining and fabrication techniques.