Engineering Mechanics

Proceedings Vol. 20 (2014)

ENGINEERING MECHANICS 2014

Copyright © 2014 Brno University of Technology Institute of Solid Mechanics, Mechatronics and Biomechanics

 

Krčmář M., Materna A.
pages 355 - 358, full text

This paper presents a method for parameter identification based on the small punch test and inverse analysis. During the small punch test a miniaturized disk specimen was deformed by a spherical punch in a manner similar to deep drawing. The experimental outcome was a force – displacement curve, which indirectly contains information concerning the mechanical properties of the tested material. The parameter identification was carried out by means of an inverse analysis which was based on the finite element modeling of the small punch test. The finite element models have to maintain the required accuracy with reasonable computational costs. The inverse analysis consists of an iterative method which minimizes error between the experimental load – displacement curve and the curves obtained via finite element modeling. The identification procedure was applied to 15Ch2MFA steel in order to estimate the true stress – true strain relationship. The identified curve was compared with the one obtained from the standard tensile test.

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