Design of an Experimental Program to Assess the Dynamic Fracture Properties of a Dual Phase Automotive Steel

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

*Corresponding author for this work

Research output: Contribution to journalConference article

2 Citations (Scopus)

Abstract

The dynamic behavior of materials must be considered when determining the crashworthiness of a vehicle and the safe design of the vehicle components. Series of mechanical tests at wide ranges of stress and strain rates are essential to identify the material's damage and fracture behavior identical to realistic conditions. In the present contribution, an extensive experimental program has been developed to assess the dynamic fracture properties of dual phase steel (DP-K 1000). Various tensile specimen geometries covering wide range of stress states are employed for testing at quasi static conditions. The limitations imposed on the sample geometries by clamping technique and requirements of high strain rate test based on split Hopkinson bar test principle restrict the use of static geometries for the dynamic range. An optimization approach based on finite element simulations has been adopted to determine the most suitable dimensions for various tensile specimen geometries quantified by stress triaxiality. The possibility of introducing a standard for dynamic sample geometries has also been investigated. Moreover, the influence of transition zone on the deformation of the specimen has been analyzed and incorporated into the optimization strategy. The optimized specimen geometries are finally adopted for dynamic material testing so as to derive enough inputs for constitutive material modeling and to facilitate fundamental material research.

Original languageEnglish
Pages (from-to)204-213
Number of pages10
JournalProcedia Engineering
Volume197
DOIs
Publication statusPublished - 1 Jan 2017
MoE publication typeA4 Article in a conference publication

Keywords

  • Dynamic
  • geometry
  • material modelling
  • optimization
  • stress triaxiality

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