Vol.15, No.3, 2015, pp. 131–134
UDC: 669.15:539.42

FINITE ELEMENT ANALYSIS OF FRACTURE RESISTANCE PARAMETERS FOR STATIONARY SEMI-ELLIPTICAL SURFACE CRACKS IN HIGH STRENGTH STEEL

Elisaveta Doncheva1, Bojan Medjo2, Aleksandar Sedmak3

1)Ss. Cyril and Methodius University, Faculty of Mechanical Engineering, Skopje, Macedonia

2)University of Belgrade, Faculty of Technology and Metallurgy, Belgrade, Serbia

3)University of Belgrade, Faculty of Mechanical Engineering, Belgrade, Serbia, asedmak@mas.bg.ac.rs

Abstract

This study deals with numerical simulations based on elastic-plastic finite element method for nonlinear stress analyses on pre-cracked tensile specimens with high strength properties. The influence of crack geometry on fracture resistance properties is considered with numerical analysis on models with two different cracks. Results on fracture resistance parameters are obtained for both simulated tensile panels with different crack lengths and width, referred as short and long crack. The obtained numerical results for crack resistance behaviour of tensile specimens are compared with data results from existing experimental investigations on specimens with same shape and material properties. Also, comparison is made with results obtained from similar standard experimental procedure. It is shown, that a proper combination of numerical and experimental procedures can lead research to significantly accurate results when investigating the fracture response of materials.

Keywords: J integral, finite element method, plastic behaviour

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