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Abstract
This paper deals with the numerical analysis of plastic deformation and damage development in S235JR steel in complex stress states. The material Gurson Tvergaard Needleman (GTN) model was applied. The analysis was performed for notched bars subjected to tension. An attempt was made to investigate the effect of stress triaxiality on the value of critical strain of voids growth in the GTN model.
Highlights
Computing load carrying capacity of steel components of civil engineering structures at the design stage is a well-defined, relatively well-known process
It is required to account for plastic reserve of the material load bearing and to apply the principles of fracture mechanics
Numerical computation performed with Gurson Tvergaard Needleman (GTN) model made it possible to identify the areas of rapid micro-damage development, and the sites of initiation of ductile fracture
Summary
Computing load carrying capacity of steel components of civil engineering structures at the design stage is a well-defined, relatively well-known process. It is far more difficult to make an analysis of existing structures operating under structural failure conditions (overload, damages to load bearing elements) In such a case, it is required to account for plastic reserve of the material load bearing and to apply the principles of fracture mechanics. Models of porous bodies offer a lot more possibilities [3, 4] They describe fracture process by means of growth and coalescence of voids that are initiated on the boundary of the metallic matrix and the second phase particles (mainly sulphur and manganese compounds) – Fig. 1. The present paper aims at determining values of effective strains that accompany micro-void growth and the component failure as a function of a degree of stress state triaxiality
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