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Abstract
This paper presents the fundamental investigation on crack propagation rate (CPR) and Stress Intensity Factor (SIF) for a typical fatigue and welded specimens which are Compact Tension (CT) and Single Edge Notch Tension (SENT) as well as Butt and longitudinal T-joint. The material data of austenitic stainless steel SS316L was used to observe crack propagation rate with different initial crack length and different tensile load was used for the fracture mechanics investigation. The geometry of the specimens was modelled by using open source software CASCA while Franc 2D was used for post processing based on Paris Erdogan Law with different crack increment steps. The analysis of crack propagation using fracture mechanics technique requires an accurate calculation of the stress intensity factor SIF and comparison of the critical strength of the material (KIC) was used to determine the critical crack length of the specimens. it can be concluded that open source finite element method software can be used for predicting of fatigue life on simplified geometry.
Highlights
The weldment of structural steel under load can fracture due to imperfection, but the process can be strongly influenced by the presence of certain components such as voids and other defects of different size which possibly evolve into crack are likely to be present in a welded joint, under increasing load the cracks begin to propagate depending on the tip of the crack.Corrosion resistance stainless steel is used to improve the strength of a components because of its lightweight in design
The analysis of crack propagation using fracture mechanics technique requires an accurate calculation of the stress intensity factor Stress Intensity Factor (SIF) and comparison of the critical strength of the material (KIC) was used to determine the critical crack length of the specimens. it can be concluded that open source finite element method software can be used for predicting of fatigue life on simplified geometry
This study aims at applying different 2D finite element method (FEM) fatigue sample model to evaluate the practicability of these concept in order to assess the critical displacement crack growth in each case for butt weld and longitudinal T- joint in a stainless steel 316
Summary
The weldment of structural steel under load can fracture due to imperfection, but the process can be strongly influenced by the presence of certain components such as voids and other defects of different size which possibly evolve into crack are likely to be present in a welded joint, under increasing load the cracks begin to propagate depending on the tip of the crack.Corrosion resistance stainless steel is used to improve the strength of a components because of its lightweight in design. The weldment of structural steel under load can fracture due to imperfection, but the process can be strongly influenced by the presence of certain components such as voids and other defects of different size which possibly evolve into crack are likely to be present in a welded joint, under increasing load the cracks begin to propagate depending on the tip of the crack. A small crack will appear due to the tensile stresses that can lead the propagation of crack up to the point where the crack cannot be controlled, this is classified as failure or sudden fracture [1]. The weld material is more brittle than the parent material making it more susceptible to failure from repeated loadings, because welding process induce voids, high tensile residual stress, local stress concentration at the weld geometry, that encourage the initiation and growth of cracks in the welded.
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