Prediction of Fatigue Failure in Engineering Component by Using Critical Distance Approach

Metkar, Rajesh; Sunnapwar, Vivek; Deo Hiwase, Subhash
November 2011
International Review of Mechanical Engineering;Nov2011, Vol. 5 Issue 7, p1254
Academic Journal
The main aim of study is to compare Finite Element Analysis results with Critical Distance Approach and study of prediction of fatigue failure in engineering component. The term Failure of a material may be defined as its fragmentation or separation, under the action of an external force, into two or more parts. It may occur as a sudden breaking up of a material either as the result of extensive plastic deformation or as a result of fatigue in a part of the material. The term 'Fatigue Failure' may be defined as the fracture which takes place under repeatedly applied fatigue stresses. It occurs at stresses well below the tensile strength of the materials. The 'Fatigue Failure' takes place due to initiation of the micro cracks at the surface of the material. The micro cracks act as the points of stress concentration. The theory of critical distances (TCD) is group of method which is used to predict the failure when a stress concentration (e.g. a crack or notch) is present. Accurate prediction is possible when elastic stress information in a critical region close to the notch tip is available, which may be found out by Finite Element Analysis. In this method, the critical region is defined in terms of a characteristic material length constant, L, which is a function of the fracture toughness Kc and a failure stress, σo.


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