An experimental and analytical study of the fatigue and fracture behaviour of ER70S-6 steel wire arc additively manufactured material

IF 5.3 2区工程技术 Q1 MECHANICS

Engineering Fracture Mechanics Pub Date : 2025-09-15 DOI:10.1016/j.engfracmech.2025.111552

Jason Jun Seo Lee , Mahirah Rohail , Tam Nguyen , Jim Galloway , Eduardo Martins Fontes do Rêgo , Mohamad T. Araji , Scott Walbridge

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引用次数: 0

Abstract

Wire arc additive manufacturing (WAAM) offers promising potential for fabricating complex steel components in structural applications, yet the mechanical performance of materials fabricated using WAAM remains relatively underexplored. This study evaluates the static and cyclic behaviour of ER70S-6 steel WAAM-fabricated specimens with the loading direction oriented both parallel and perpendicular to the weld path. While tensile strength is seen to be comparable to mild steel, fatigue behaviour is seen to depend largely on surface roughness and vary significantly with print direction. Fatigue life is analyzed using International Institute of Welding (IIW) statistical methods to generate S-N curves, incorporating area corrections from 3D scans. Using this approach, detail categories are established according to the IIW recommendations and North American standards. Following this, a strain-based fracture mechanics (SBFM) model is used to evaluate fatigue performance, with notch factors obtained through a process of 3D scanning and finite element analysis. The findings underscore the influence of anisotropy and surface roughness on fatigue behaviour and demonstrate the applicability of fracture mechanics methods such as SBFM for evaluating WAAM materials.

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对ER70S-6钢丝增材材料的疲劳断裂行为进行了试验和分析研究

电弧增材制造（WAAM）为结构应用中复杂钢构件的制造提供了巨大的潜力，但使用WAAM制造的材料的机械性能仍未得到充分探索。本文研究了平行和垂直于焊缝路径加载方向下，ER70S-6钢waam预制试件的静力和循环性能。虽然抗拉强度与低碳钢相当，但疲劳性能在很大程度上取决于表面粗糙度，并随打印方向而显著变化。疲劳寿命分析采用国际焊接学会（IIW）统计方法生成S-N曲线，结合三维扫描的面积校正。使用这种方法，根据IIW建议和北美标准建立详细类别。随后，采用基于应变的断裂力学（SBFM）模型，通过三维扫描和有限元分析获得缺口因子，对疲劳性能进行评估。研究结果强调了各向异性和表面粗糙度对疲劳行为的影响，并证明了断裂力学方法（如SBFM）在评估WAAM材料方面的适用性。

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

Engineering Fracture Mechanics 物理-力学

CiteScore

8.70

自引率

13.00%

发文量

606

审稿时长

74 days

期刊介绍： EFM covers a broad range of topics in fracture mechanics to be of interest and use to both researchers and practitioners. Contributions are welcome which address the fracture behavior of conventional engineering material systems as well as newly emerging material systems. Contributions on developments in the areas of mechanics and materials science strongly related to fracture mechanics are also welcome. Papers on fatigue are welcome if they treat the fatigue process using the methods of fracture mechanics.