Fatigue Life Prediction Of Crankshaft Based On Strain Life Theories

Fatigue Life Prediction Of Crankshaft Based On Strain Life  Theories
Authors : Anant Prakash Agrawal , Dr. S. K. Srivastava
Publication Date: 29-10-2012


Author(s):  Anant Prakash Agrawal , Dr. S. K. Srivastava

Published in:   International Journal of Engineering Research & Technology

License:  This work is licensed under a Creative Commons Attribution 4.0 International License.

Website: www.ijert.org

Volume/Issue:   Vol.1 - Issue 8 (October - 2012)

e-ISSN:   2278-0181


Fatigue analysis can be performed using one of the three basic methodologies such as stress-life theory, strain-life theory, and crack growth approach. These techniques are developed to determine the number of cycles to failure. Stress- life theory suitable when elastic stresses and strains are considered. However, for the components having nominal cyclic elastic stresses and plastic deformation, local strain-life theory is used for predicting the fatigue life. In the present work, fatigue behaviour of forged steel crankshaft, subjected to fully reversible cyclic loading, is analyzed using the strain-life theories. The analyses are aimed to identify the critical location through Finite Element Fatigue Analysis (FEFA) and, to predict the fatigue life of crankshaft. The modelling of crankshaft is carried out in parametric Pro/Engineer software whereas ANSYS workbench is used for the Finite Element Analysis (FEA). Maximum Von Mises stresses criterion is used for predicting the failure of crankshaft. Fillet area at crankpin is identified critical where stresses generated exceed the elastic limit. It is observed that Coffin-Manson strain-life theory is found to be conservative compared to Morrow and Smith-Watson-Topper (SWT) strain-life theories.


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