Diagnostics of Strain Hardening Exponent and Material Constant of Steel Sheets

Abstract:

This paper deals with evaluation of n strain hardening exponent and C material constant at various velocities of the strain rate according to EN 10002-1. Dependence of tensile stress on elongation is carried out at INSTRON shredder in digital form and it is directly introduced into MATLAB working environment. To determine these material parameters suitable material models (Krupkowsky model) and MATLAB programming pack, mainly its Curve Fitting toolbox, which provides the library of standard linear, nonlinear and nonparametric models (e.g. polynomial, rational, etc.), are used. At automobile crash tests kinetic energy conversion into energy of deformation (where it is necessary to know n, C) is theoretically calculated at certain velocities so that the solid parts of the car body would be protected from damage. It would be the best to compare correctness of those calculations to the test carried out at a real model or by simulation created on the computer with necessary software equipment.

• Periodical: Applied Mechanics and Materials (Volume 616)
• Pages: 252-259
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.616.252
• Online since: August 2014
• Authors: Erika Fechová*, Jozef Kmec
• Keywords: Deformation Energy, Material Constant, MATLAB Software, Strain Hardening Exponent

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