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Dynamic fracture of a dual phase automotive steel

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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.
Keywords
Dynamic damage and fracture, Split Hopkinson bar, Digital image correlation, material modelling, crash worthiness

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Chicago
Chandran, Sarath, Patricia Verleysen, Junhe Lian, Wenqi Liu, and Sebastian Münstermann. 2018. “Dynamic Fracture of a Dual Phase Automotive Steel.” Ed. E. Buzaud, A. Cosculluela, H. Couque, and E. Cadoni. EPJ Web of Conferences 183.
APA
Chandran, S., Verleysen, P., Lian, J., Liu, W., & Münstermann, S. (2018). Dynamic fracture of a dual phase automotive steel. (E. Buzaud, A. Cosculluela, H. Couque, & E. Cadoni, Eds.)EPJ Web of Conferences, 183. Presented at the DYMAT 2018 - 12th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading.
Vancouver
1.
Chandran S, Verleysen P, Lian J, Liu W, Münstermann S. Dynamic fracture of a dual phase automotive steel. Buzaud E, Cosculluela A, Couque H, Cadoni E, editors. EPJ Web of Conferences. France: EDP Sciences; 2018;183.
MLA
Chandran, Sarath, Patricia Verleysen, Junhe Lian, et al. “Dynamic Fracture of a Dual Phase Automotive Steel.” Ed. E. Buzaud et al. EPJ Web of Conferences 183 (2018): n. pag. Print.
@article{8574897,
  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.},
  articleno    = {02047},
  author       = {Chandran, Sarath and Verleysen, Patricia and Lian, Junhe and Liu, Wenqi and M{\"u}nstermann, Sebastian},
  editor       = {Buzaud, E. and Cosculluela, A. and Couque, H. and Cadoni, E.},
  isbn         = {978-2-7598-9053-8},
  journal      = {EPJ Web of Conferences},
  keyword      = {Dynamic damage and fracture,Split Hopkinson bar,Digital image correlation,material modelling,crash worthiness},
  language     = {eng},
  location     = {Arcachon, France},
  pages        = {6},
  publisher    = {EDP Sciences},
  title        = {Dynamic fracture of a dual phase automotive steel},
  url          = {http://dx.doi.org/10.1051/epjconf/201818302047},
  volume       = {183},
  year         = {2018},
}

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