Proposal of a New Tool for Pre-Straining Operations of Sheet Metals and an Initial Investigation of CR4 Mild Steel FormabilityShow others and affiliations
2023 (English)In: IOP Conference Series: Materials Science and Engineering, ISSN 1757-899X, Vol. 1284, article id 012079Article in journal (Refereed) Published
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
2023. Vol. 1284, article id 012079
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:ri:diva-66465DOI: 10.1088/1757-899x/1284/1/012079OAI: oai:DiVA.org:ri-66465DiVA, id: diva2:1795016
Conference
42nd Conference of the International Deep Drawing Research Group (IDDRG 2023)
Note
This study was alsofunded by VINNOVA in the Sustainable Production sub-program within Vehicle StrategicResearch and Innovation (FFI) program (grant number 2020-02986).
2023-09-072023-09-072023-12-28Bibliographically approved