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Finite Element Analysis of Fatigue Life Assessment of Butt & Fillet Welded Joint with Cracks

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 Journal of Engineering Innovation and Research

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 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. Full Article

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Competitive Advantage through Design for Environment (DfE)

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 New environmental requirements demand greater emphasis on all life cycle phases which need to be considered in product design stage. Environmental pollution, global warming, deteriorating life standards warrant holistic approach toward sustainable development. Design for Environment (DfE) is an innovative practice by which firms may effectively manage environmental impacts so as to mitigate environmental threats as well as create competitive advantages.  Full Article

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