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Proposal of a New Tool for Pre-Straining Operations of Sheet Metals and an Initial Investigation of CR4 Mild Steel Formability
Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.ORCID iD: 0000-0001-9889-6746
Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.ORCID iD: 0000-0002-7730-506x
Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.ORCID iD: 0000-0002-1162-7023
RISE, Sweden.
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2023 (English)In: 42ND CONFERENCE OF THE INTERNATIONAL DEEP DRAWING RESEARCH GROUP / [ed] Asnafi, N Lindgren, LE, IOP PUBLISHING LTD , 2023, Vol. 1284, article id 012079Conference paper, Published paper (Refereed)
Abstract [en]

With the increased focus on reducing carbon emissions in the automotive industry, more advanced materials are introduced to reduce the vehicle weight, and more complex component geometries are designed to both satisfy customer demands and to optimize the vehicle aerodynamically. With the increase in component complexity, the strain paths produced during the forming operation of car body components often display a highly non-linear behavior which makes the task of failure prediction during the manufacturing feasibility studies more difficult. Therefore, CAE engineers need better capabilities to predict failure induced by strain path nonlinearity. This study proposes a new tool designed for creating bi-linear strain paths, by performing a pre-strain of a sheet large enough to cut out Nakajima specimens to perform the post-straining in any direction. From five pre-straining tests the tool present a stable pre-straining operation with a uniform strain field in a radius of 100 [mm] from the centre, corresponding to the region of interest of a Nakajima specimen. From the five pre-strained samples, different Nakajima specimens are cut transverse and longitudinal to the rolling direction and a failure prediction approach in an alternative, path independent evaluation space was used to predict the onset of necking with promising results.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2023. Vol. 1284, article id 012079
Series
IOP Conference Series-Materials Science and Engineering, ISSN 1757-8981
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:bth-25239DOI: 10.1088/1757-899X/1284/1/012079ISI: 001017824300079OAI: oai:DiVA.org:bth-25239DiVA, id: diva2:1786263
Conference
42nd Conference of the International-Deep-Drawing-Research-Group (IDDRG), JUN 19-22, 2023, Lulea, SWEDEN
Part of project
PREDICT- Failure prediction for complex load cases, Knowledge Foundation, Vinnova
Funder
Vinnova, 2020-02986Available from: 2023-08-08 Created: 2023-08-08 Last updated: 2023-08-08Bibliographically approved

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Barlo, AlexanderSigvant, MatsIslam, Md. ShafiqulTuan Pham, QuocPilthammar, Johan

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