Influence of residual thermal stresses on fatigue crack growth life of discontinuous reinforcements in metal matrix composites |
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| Authors: | A Tevatia S K Srivastava |
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| Affiliation: | 1. Division of Manufacturing Process and Automation Engineering, Netaji Subhas Institute of Technology, Sec-3, Dwarka, New Delhi, 110078 India;2. Mechanical Engineering Department, Madan Mohan Malaviya University of Technology, Gorakhpur, UP, 273 010 India |
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| Abstract: | The fatigue life prediction model based on crack propagation from micro-structural features is derived and presented for planar and randomly oriented Discontinuous Reinforced Metal Matrix Composites (DRMMCs). The model contains the influence of micro-structural properties such as aspect ratio, volume fraction of particle/fibre and constraint between particle and the matrix. The effect of residual thermal stresses generated within the matrix during development of composite is considered. The particle/fibre plays a dominant role in the development of the cyclic plastic zone size ahead of the crack tip; moreover, it enhances the cyclic plastic deformation characteristics of DRMMC. The theoretical model-based evaluations for low cycle fatigue in DRMMCs are within the proximity of the experimental results. |
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| Keywords: | cyclic plastic zone fatigue crack growth fatigue life prediction large scale yielding residual thermal stresses |
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