IMPACT OF STRAIN RATE-DEPENDENT MATERIAL MODELS ON CRASHWORTHINESS SIMULATIONS BY USING LS-DYNA

Aytimur E. E.

European Conference on Fracture 2024, Zagreb, Croatia, 26 - 30 August 2024, pp.670

  • Publication Type: Conference Paper / Summary Text
  • City: Zagreb
  • Country: Croatia
  • Page Numbers: pp.670
  • Kocaeli University Affiliated: Yes

Abstract

This study examines the effect of strain rate-dependent material models—Johnson-Cook, Cowper-Symonds—, and Elastic models on crashworthiness simulations of mild steel, using ANSYS LS-DYNA. The research examines the deformation, deceleration, and recovery coefficients under single impact simulations according to NHTSA regulations [2] with material parameters from Škrlec and Klemenc's study. Results show that the Johnson-Cook model, which captures strain rate sensitivity well, has the lowest total deformation and highest equivalent stress compared with Cowper Symonds and Elastic models. The findings emphasize the importance of selecting appropriate material models for collision simulations based on accuracy, computational efficiency, and complexity tolerance.