Calibration of the shear-modified GTN model for HAZ of butt-welded high-strength steel (HSS)

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-09-24 DOI:10.1016/j.tws.2025.114027

Yize Gao , Rui Yan , Milan Veljkovic , Kristo Mela , Guo-Qiang Li , Yan-Bo Wang , Xiao-Ling Zhao

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引用次数: 0

Abstract

Welding induces microstructural changes in the base metal, forming a heat-affected zone (HAZ) that is especially prone to strength degradation in high-strength steel (HSS) connections. While the mechanical behavior of welded joints is strongly influenced by the softened HAZ, most existing research has focused on its tensile and fatigue properties, with limited attention given to its shear behavior, despite evidence of shear failure mechanisms in certain welded structures.

Building on recent advances in damage modeling, this paper calibrates a shear-modified Gurson-Tvergaard-Needleman (GTN) model tailored for the HAZ. The GTN model, which uses void volume fraction as a damage index and accounts for microvoids and stress triaxiality, is extended here to better capture shear-dominated failure modes. In the meantime, shear tests were conducted on coupon specimens extracted from butt-welded cold-formed rectangular hollow sections fabricated from three steel grades and three thicknesses. Load-deformation curves and local strain measurements are obtained from these shear tests. Finite element (FE) simulations of the HAZ, incorporating the shear-modified GTN model, are conducted. The experimentally measured load-deformation curves are used to calibrate the parameters of the shear-modified GTN model, while the measured local strains serve to validate the FE model. Practical values for the key parameters of the shear-modified GTN model are recommended for engineering applications. The estimated ultimate load carrying capacity based on the proposed model is in close agreement (approximately 5 %) with the experimental values. The limitations of the proposed model and directions for future research are also pointed out.

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对焊高强钢热影响区剪切修正GTN模型的标定

焊接引起母材的显微组织变化，形成热影响区（HAZ），在高强度钢（HSS）连接中特别容易产生强度下降。虽然焊接接头的力学行为受软化热影响很大，但大多数现有研究都集中在其拉伸和疲劳性能上，而对其剪切行为的关注有限，尽管在某些焊接结构中有剪切破坏机制的证据。基于损伤建模的最新进展，本文校准了为HAZ量身定制的剪切修正Gurson-Tvergaard-Needleman （GTN）模型。GTN模型使用孔隙体积分数作为损伤指标，并考虑了微孔隙和应力三轴性，在这里进行了扩展，以更好地捕捉剪切主导的破坏模式。同时，对3种钢种、3种厚度的冷弯矩形空心型钢对焊接头试件进行了剪切试验。从这些剪切试验中获得了荷载-变形曲线和局部应变测量值。采用剪切修正GTN模型对热影响区进行了有限元模拟。试验测得的荷载-变形曲线用于校正剪切修正GTN模型的参数，而实测的局部应变用于验证有限元模型。给出了剪切修正GTN模型关键参数的实用值，供工程应用参考。根据所提出的模型估计的极限承载能力与实验值接近（约5%）。指出了模型的局限性和未来的研究方向。

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

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.