Dynamic fracture of a dual phase automotive steel

Sarath Chandran*, Patricia Verleysen, Junhe Lian, Wenqi Liu, Sebastian Münstermann

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

1 Citation (Scopus)

Abstract

Dynamic testing of sheet metals has become more important due to the need for more reliable vehicle crashworthiness assessments in the automotive industry. The study presents a comprehensive set of experimental results that covers a wide range of stress states on a dual phase automotive sheet steel. Split Hopkinson bar tensile (SHBT) tests are performed on dogbone shaped samples to obtain the plastic hardening properties at high strain rates. A set of purpose designed sample geometries comprising of three notched dogbone tension samples is tested at high strain rates to characterise the dynamic damage and fracture properties under well controlled stress states. The geometry of the samples is optimised with the aid of finite element analysis. During the tests, high speed photography together with digital image correlation are implemented to acquire full field measurements and to gain more insight into the localisation of strains at high strain rates. An experimental-numerical approach is proposed to effectively determine the fracture characteristics of the dual phase steel under extreme conditions. A modified Bai-Wierzbicki model is implemented to assess the damage initiation and subsequent failure. Additionally, the fracture mechanisms are studied utilizing scanning electron microscopy.

Original languageEnglish
Title of host publicationDYMAT 2018 - 12th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading
PublisherEDP SCIENCES
Volume183
ISBN (Print)9782759890538
DOIs
Publication statusPublished - 7 Sep 2018
MoE publication typeA4 Article in a conference publication
EventInternational Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading - Arcachon, France
Duration: 9 Sep 201814 Sep 2018
Conference number: 12

Conference

ConferenceInternational Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading
Abbreviated titleDYMAT
CountryFrance
CityArcachon
Period09/09/201814/09/2018

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