Harmfulness Defect in Double-Notched Specimen of S533 Steel

Ouhimmou Siham,Salmi Houda,Hachim Abdelilah,Institut Supérieur D'etudes Maritimes (Isem) Km 7, Route D'el Jadida

doi:10.35940/ijeat.d7400.049420

Abstract

The analytical solving of fracture mechanics equations remains insufficient for complex mechanisms, hence the use of finite element methods (FEM). The paper considered a test specimen with double S355 steel notches, stressed in tension, causing crack opening with two planes of symmetry. The refinement of the mesh is carried out at the bottom of the notch using the elements of Barsoum. The stress concentration coefficient and the crack propagation velocity are evaluated.

Highlights

The understanding of this phenomenon involves the numerical modeling of the structure but the analytical resolution of the resulting equations remains limited to simple problems whereas in reality there are complex mechanisms. the harmfulness of the defaults is measured in elasticity by the stress intensity factor and in elasto-plasticity by the integral of contour J; scientific research is concerned with numerical simulations by classical methods based on the finite element method (FEM) coupled with the mechanics of fracture [1,2]
In the first part of this work, we considered a material mainly used in pressure equipment, we modeled a specimen with double lateral notches, stressed in tension, causing crack opening
This study has used several branches of mechanics ranging fracture mechanics and the finite element method which has become unavoidable at present given its power for solving complex problems, the integrity of our approach

Summary

Introduction

To meet ever higher performance requirements, manufacturers must at best anticipate the presence of structural defects in their actual operating conditions. In this context, the majority of failures in pressure equipment are due to stress concentrations in the vicinity of a defect. The majority of failures in pressure equipment are due to stress concentrations in the vicinity of a defect The understanding of this phenomenon involves the numerical modeling of the structure but the analytical resolution of the resulting equations remains limited to simple problems whereas in reality there are complex mechanisms. All this work and many others have shown the need to use numerical methods given the complexity of the stress field at the level of defects in pressure equipment.The industrial objectives of the paper are the determination of the harmfulness of the defects studied and the application of the numerical tools validated experimentally

Objectives

Results

Conclusion