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Year 2009
Title Finite Element Analysis of Fatigue Life Assessment of Butt & Fillet Welded Joint with Cracks
Authors Arun Kumar Rout , Ashok Kumar Rout
Broad area Mechanical Engineering
Abstract
 The S-N curves based fatigue designs of welded components and structures do not fully represent the weld details like effects of geometry, welding process and material defects. Experimental fatigue life prediction of welded joints is time consuming and costly. These limitations have prompted the need for adopting other ways for modeling the fatigue process rather than simply relating applied stress and fatigue life as in the S-N curves. A recent trend in this regard is the use of local approaches like fracture mechanics based attempts to model the whole fatigue process by considering the above effects. The stress at the crack tip can be accurately evaluated by means of linear elastic fracture mechanics by using suitable singular crack tip elements and proper mesh density. This can be further used to predict the fatigue life of a welded joint by using Paris’s law. The final crack length of a welded joint can be found out by virtual crack extension method (VCEM), where the final crack length is that crack length at which for a given loading the stress intensity factor of a crack approaches or exceeds an upper limit known as critical stress intensity factor.
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Referenceses
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