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A Study of the Boundary Conditions in the ISO-16630 Hole Expansion Test
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
RISE IVF AB.
Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.ORCID iD: 0000-0002-1162-7023
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2022 (English)In: INTERNATIONAL DEEP-DRAWING RESEARCH GROUP CONFERENCE (IDDRG 2022) / [ed] Thuillier, S Grolleau, V Laurent, H, Institute of Physics (IOP), 2022, Vol. 1238Conference paper, Published paper (Refereed)
Abstract [en]

As new and more advanced sheet metal materials are introduced to the market, more accurate techniques for determination of failure limits are needed. One area that needs attention is edge formability, where the ISO-16630 standardized Hole Expansion Test currently is used to express this through the Hole Expansion Ratio. Over the years, this standard has been criticized for producing a large scatter in repeated tests. This paper investigates a new setup for the Hole Expansion Test which introduces draw beads into the setup to ensure sufficient restraining of the specimen during the test in an effort to reduced the scatter. In total 62 tests of a DP800 steel alloy were executed, but a large scatter in the results were still seen. It was therefore concluded that a lack of restraining force in the Hole Expansion Test was not the primary cause of the reported scatter seen in other tests.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2022. Vol. 1238
Series
IOP Conference Series-Materials Science and Engineering, ISSN 1757-8981, E-ISSN 1757-899X
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:bth-24207DOI: 10.1088/1757-899X/1238/1/012031ISI: 000894042400031OAI: oai:DiVA.org:bth-24207DiVA, id: diva2:1729455
Conference
41st Annual Conference of the International-Deep-Drawing-Research-Group (IDDRG), JUN 06-10, 2022, Lorient, FRANCE
Part of project
PREDICT- Failure prediction for complex load cases, Knowledge Foundation, Vinnova
Funder
Vinnova, 2020-02986
Note

open access

Available from: 2023-01-20 Created: 2023-01-20 Last updated: 2023-02-22Bibliographically approved
In thesis
1. Failure Prediction of Complex Load Cases in Sheet Metal Forming: Emphasis on Non-Linear Strain Paths, Stretch-Bending and Edge Effects
Open this publication in new window or tab >>Failure Prediction of Complex Load Cases in Sheet Metal Forming: Emphasis on Non-Linear Strain Paths, Stretch-Bending and Edge Effects
2023 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

With the increased focus on reducing carbon emissions in today’s society, several industries have to overcome new challenges, where especially the automotive industry is under a lot of scrutiny to deliver improved and more environmentally friendly products. To meet the demands from customers and optimize vehicles aerodynamically, new cars often contain complex body geometries, together with advanced materials that are introduced to reduce the total vehicle weight. With the introduction of the complex body components and advanced materials,one area in the automotive industry that has to overcome these challenges is manufacturing engineering, and in particular the departments working with the sheet metal forming process. In this process complex body component geometries can lead to non-linear strain paths and stretch bending load cases, and newly introduced advanced materials can be prone to exhibit behaviour of edge cracks not observed in conventional sheet metals. This thesis takes it onset in the challenges seen in industry today with predicting failure of the three complex load cases: Non-Linear Strain Paths, Stretch-Bending,and Edge Cracks. Through Finite Element simulation attempts are made to accurately predict failure caused by aforementioned load cases in industrial components or experimental setups in an effort to develop post-processing methods that are applicable to all cases.

Place, publisher, year, edition, pages
Karlskrona: Blekinge Tekniska Högskola, 2023. p. 125
Series
Blekinge Institute of Technology Licentiate Dissertation Series, ISSN 1650-2140 ; 3
Keywords
Sheet Metal Forming, Failure Prediction, Non-Linear Strain Paths, Stretch-Bending, Edge Effects
National Category
Mechanical Engineering Applied Mechanics
Research subject
Mechanical Engineering
Identifiers
urn:nbn:se:bth-24300 (URN)978-91-7295-451-9 (ISBN)
Presentation
2023-04-06, J1630, Valhallavägen 1, Karlskrona, 10:00 (English)
Opponent
Supervisors
Funder
Vinnova, 2020-02986
Available from: 2023-02-27 Created: 2023-02-22 Last updated: 2023-04-19Bibliographically approved

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Barlo, AlexanderSigvant, MatsIslam, Md. ShafiqulPilthammar, Johan

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