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Modelling a Response of Complex-Phase Steel at High Strain Rates.

Andrej Škrlec1, Tadej Kocjan1, Marko Nagode1

  • 1Faculty of Mechanical Engineering, University of Ljubljana, 1000 Ljubljana, Slovenia.

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Summary
This summary is machine-generated.

This study models high-strength steel SZBS800 response under varying strain rates using the Cowper-Symonds model. Optimized parameters accurately predict material behavior across different loading conditions.

Keywords:
Cowper–Symonds modelcomplex phase steelgenetic algorithmmulti-criterion objective functionresponse surface

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Computational Mechanics

Background:

  • Complex-phase high-strength steels require accurate constitutive models for performance prediction.
  • Understanding strain-rate sensitivity is crucial for materials subjected to dynamic loading.
  • The Cowper-Symonds model is a common approach for capturing strain-rate effects in metals.

Purpose of the Study:

  • To develop and validate a constitutive model for SZBS800 steel considering strain-rate influence.
  • To determine the optimal parameters for the Cowper-Symonds model using experimental data and numerical methods.
  • To assess the accuracy of the model in predicting material response under various strain rates.

Main Methods:

  • Experimental characterization using tensile tests at low strain rates.
  • High strain rate testing via ballistic impact experiments.
  • Application of a viscoplastic Cowper-Symonds material model formulation.
  • Parameter estimation using a stepwise procedure: grid search and reverse engineering.
  • Optimization using explicit dynamic simulations, a multi-criteria cost function, and a real-valued genetic algorithm.

Main Results:

  • Successful estimation of Cowper-Symonds model parameters (SIGY, p, C) for SZBS800 steel.
  • The optimized model accurately represents the material's response across a range of strain rates.
  • Identified wide optimal domains for parameters 'p' and 'C', indicating robustness in the parameterization process.

Conclusions:

  • The developed Cowper-Symonds model effectively captures the strain-rate-dependent behavior of SZBS800 steel.
  • The combination of experimental testing and advanced numerical optimization provides reliable material model parameters.
  • The findings contribute to the accurate simulation and design of structures utilizing high-strength steels in dynamic applications.