Automation and Autonomous Systems

S. Sivakumar ¹, R. Ravichandaran ², G. Thanigaiyarasu ³

Affiliations
1 Arunai Engineering College, Tiruvannamalai, IN
2 Department of Mechanical Engineering, Arunai Engineering College, Tiruvannamalai, IN
3 CTDT, Anna university Chennai, Chennai, IN

Abstract

Four point bend specimen is one of the most important specimens of the fracture mechanics because it can produce mixed mode I and II. Therefore, computation of stress intensity factors (SIF) in this specimen is of practical interest. Several relations have been suggested that no one of them completely has considered the effects of the loading point and crack geometry. In this paper mixed mode stress intensity factors of the bend specimen are computed by finite element method (FEM) and after validating by comparing with the available results in the literature, the results will be assessed to determine the effects of different crack location and load distances from the middle of the specimen. Finally, two new coefficients comprising these effects are introduced.

Keywords

Four Point Bend Specimen, Mixed Mode, Finite Element Method.

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M. Logesh ¹, R. Ravichandaran ², S. Sivakumar ³

Affiliations
1 Department of Mechanical Engineering, Arunai Engineering College, Tiruvannamalai, IN
2 Department of Mechanical Engineering, Arunai Engineering College, Tiruvannamalai, IN
3 Arunai Engineering College, Tiruvannamalai, IN

Abstract

predictive method for remaining component lifetime evaluation consists in integrating the crack growth law of the material considered in a finite element step-by-step process. So, as part of a linear elastic fracture mechanics analysis, the determination of the stress intensity factor distribution is a crucial point. Two-dimensional, elastic–plastic finite element analyses of Edge-crack geometries with different crack length were conducted to study fracture parameters and to calculate J integral values under plane-stress conditions. Mesh refinement for the geometries were studied. Numerical implementation and mesh refinement issues to maintain path independent J-values are explored .The present work considers mode-I, linear-elastic response of cracked finite FML subjected to monotonic loading. The results obtained by these various means on cracked FML are in good agreement with those available analytical solutions. Nevertheless, since the knowledge of the field near the crack tip is not required in the energetic method, the J-integral calculations seem to be a good technique to deal with the fatigue growth of general cracks.

Keywords

Crack Growth, Finite Element Method, J-Integral, Stress Intensity Factor.

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