Testing and modelling of residual stresses within Q690 high strength steel press-braked round-ended oval hollow section

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-01-17 DOI:10.1016/j.tws.2025.112974

Jun-Zhi Liu , Heng Zhang , Jiachen Guo , Xiaowei Ma , Junbo Chen , Fei Xu

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引用次数: 0

Abstract

This research explores the material properties and residual stresses of Q690 high-strength steel (HSS) round-ended oval hollow sections (ROHS), fabricated from steel plates after press-braking and welding. It aims to fill the existing knowledge gap concerning the mechanical properties of this novel section profile. Four Q690 HSS press-braked ROHS were examined, employing both transverse bending and longitudinal welding techniques. In addition to the material properties investigation, membrane and bending residual stresses in the longitudinal direction were assessed. The wire cutting method was utilised to create testing strips, resulting in 60 strips with more than720 strain measurements taken. Complementing the experimental tests, an integrated sequentially-coupled thermo-mechanical analysis was performed by developing an advanced lumped line finite element (FE) model. Solid element was used in simulating both cold-forming and welding process, and birth and death techniques was used to replicate the multi-pass welding and the melting of the welding rod. As a result, an explicit residual stress distribution in the longitudinal direction along the perimeter, resulting from cold-forming process and welding, was established. The collected experimental and simulation results elucidated the levels and distribution characteristics of the residual stresses, leading to the development and proposal of predictive models for residual stresses of the press-braked ROHS containing two different fabrication routes.

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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.