Strain Controlled Fatigue Life Prediction of Materials

Upadhyaya, Y S and Sridhara, B K (2012) Strain Controlled Fatigue Life Prediction of Materials. International Journal of Research in Engineering and Technology, 1 (3). pp. 153-157. ISSN 2277 – 4378

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Abstract

Strain controlled fatigue life of EN 19 steel and 6082- T6 aluminum alloy have been predicted considering both crack initiation and crack propagation phases. Continuum Damage Mechanics (CDM) approach models the crack initiation life with a damage value and damage beyond the crack initiation phase is predicted by Fracture Mechanics in terms of crack size. Fatigue life is predicted for a smooth (un-notched) specimen in the strain amplitude range of 0.3 % to 0.7 %, in room temperature at stress ratio of -1. The inputs required for both the models have been determined by conducting monotonic, cyclic, fracture toughness and fatigue crack growth tests. Predicted life is also compared by conducting strain controlled fatigue tests and predicted life compares well with the experimental life. The results show that by using monotonic, cyclic and fracture parameters of a material available in literature and by conducting Multiple Step Test on one fatigue specimen, it is possible to determine strain controlled crack initiation and crack propagation life of metals and alloys.

Item Type: Article
Uncontrolled Keywords: Continuum damage mechanics, fatigue, fracture mechanics, life prediction.
Subjects: Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 11 Apr 2013 11:28
Last Modified: 11 Apr 2013 11:28
URI: http://eprints.manipal.edu/id/eprint/79671

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