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A damage characterization method for thin-walled butt welded joints with slant fracture in 6005A-T6 aluminum alloy
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology. School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China; Department of Engineering Mechanics, KTH Royal Institute of Technology, Stockholm 10044, Sweden; National International Science and Technology Cooperation Base on Railway Vehicle Operation Engineering, Beijing Jiaotong University, Beijing 100044, China.ORCID iD: 0000-0002-8024-8430
School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China; National International Science and Technology Cooperation Base on Railway Vehicle Operation Engineering, Beijing Jiaotong University, Beijing 100044, China.
School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China; National International Science and Technology Cooperation Base on Railway Vehicle Operation Engineering, Beijing Jiaotong University, Beijing 100044, China.
School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China; National International Science and Technology Cooperation Base on Railway Vehicle Operation Engineering, Beijing Jiaotong University, Beijing 100044, China.
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2025 (English)In: Engineering Fracture Mechanics, ISSN 0013-7944, E-ISSN 1873-7315, Vol. 315, article id 110841Article in journal (Refereed) Published
Abstract [en]

The load-bearing performance of train bodies under complex service conditions requires accurate evaluation, necessitating substantial analysis of the damage and fracture behavior of thin-walled structures with heterogeneous materials under complex stress states. To address this requirement, this study focuses on MIG-welded thin-walled 6005A-T6 aluminum alloy and proposes a parameter identification method based on the bilevel parallel optimization principle. The welding regions were characterized through metallographic and microhardness tests, and specimens were designed with pre-crack tips located in various welding regions. This enabled the calibration of material parameters from the elastic to the fracture stages for each welding region. By smoothing the material properties at the boundaries of the welding regions based on surface interpolation principles, the complex fracture behaviors, such as slant fractures and V-shaped fractures, were successfully represented. The predicted load–displacement curves closely matched the experimental results, with a relative error in peak force prediction within 8%. The proposed damage characterization method effectively captures material deformation behavior and accurately predicts fracture performance, offering potential refinements to current standards for welding crack propagation tests.

Place, publisher, year, edition, pages
Elsevier BV , 2025. Vol. 315, article id 110841
Keywords [en]
Damage model, MIG-welded joint, Parameter calibration, Slant fracture, Thin-walled structure
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-359303DOI: 10.1016/j.engfracmech.2025.110841ISI: 001407330000001Scopus ID: 2-s2.0-85215425630OAI: oai:DiVA.org:kth-359303DiVA, id: diva2:1932630
Note

QC 20250131

Available from: 2025-01-29 Created: 2025-01-29 Last updated: 2025-02-12Bibliographically approved

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Zhu, BinHultgren, GustavBarsoum, Zuheir

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