Dynamic fracture of a dual phase automotive steel 机翻标题: 暂无翻译,请尝试点击翻译按钮。

会议集名/来源
12th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading (DYMAT 2018): Arcachon(FR).9-14 September 2018
出版年
2018
页码
579-584,02047
会议地点
Arcachon
作者单位
DyMa Lab, EEMMeCS department, Ghent University, Technologie park 903, Zwijnaarde 9052, Ghent, BelgiumDyMa Lab, EEMMeCS department, Ghent University, Technologie park 903, Zwijnaarde 9052, Ghent, BelgiumSteel Institute, RWTH Aachen University, Intzestrasse 1, 52072 Aachen, GermanySteel Institute, RWTH Aachen University, Intzestrasse 1, 52072 Aachen, GermanySteel Institute, RWTH Aachen University, Intzestrasse 1, 52072 Aachen, Germany
作者
Sarath Chandran;Patricia Verleysen;Junhe Lian;Wenqi Liu;Sebastian Munstermann
摘要
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.
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