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A fracture mechanics approach to develop high crash resistant microstructures by press hardening
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
Fundació CTM Centre Tecnològic, Plaça de la Ciència 2, 08243 Manresa, Spai.
undació CTM Centre Tecnològic, Plaça de la Ciència 2, 08243 Manresa, Spai.
undació CTM Centre Tecnològic, Plaça de la Ciència 2, 08243 Manresa, Spai.
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2017 (English)In: 6th International Conference Hot Sheet Metal Forming of High-Performance Steel CHS2: June 4-7 2017, Atlanta, Georgia, USA : proceedings / [ed] Mats Oldenburg, Braham Prakash, Kurt Steinhoff, Warrendale, PA: Association for Iron & Steel Technology, AIST , 2017, 101-107 p.Conference paper (Refereed)
Abstract [en]

Crashworthiness is a relevant engineering property for car parts. However it is not easy to measure at laboratory scale and complex impact tests have to be carried out to determine it. Crash resistance for high strength steel is commonly evaluated in terms of cracking pattern and energy absorption in crashed specimens. Accordingly, the material resistance to crack propagation, i.e. the fracture toughness, could be used to rank crashworthiness. It has been proved in a previous work by the authors, so the measure of fracture toughness, in the frame of fracture mechanics in small laboratory specimens, would allow determining the best microstructure for crash resistance parts. Press hardening offers the possibility to obtain a wide range of microstructural configurations, with different mechanical properties. So the aim of this work is to evaluate the fracture toughness following the essential work of fracture methodology for ferrite-pearlite, bainite, ferrite-bainite, martensite and martensite-bainite microstructures. Results showed that bainitic microstructures have high fracture toughness, similar to TWIP and CP steels, which allows pointing them as potential candidates for obtaining high crash resistance in parts manufactured by press hardening.

Place, publisher, year, edition, pages
Warrendale, PA: Association for Iron & Steel Technology, AIST , 2017. 101-107 p.
Series
CHS2-series, 6
National Category
Other Mechanical Engineering Applied Mechanics
Research subject
Solid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-64054ISBN: 978-1-935117-66-7 (print)OAI: oai:DiVA.org:ltu-64054DiVA: diva2:1110098
Conference
6th International Conference Hot Sheet Metal Forming of High-Performance Steel CHS2, Atlanta, Georgia, 4-7 June 2017
Available from: 2017-06-15 Created: 2017-06-15 Last updated: 2017-06-21Bibliographically approved

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Casellas, DanielJonsén, PärGolling, StefanOldenburg, Mats
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