Crack Initiation Mechanism of a Cast Hybrid MMC in Low Cycle Fatigue

Abstract:

The low-cycle fatigue (LCF) behavior specially the fracture initiation mechanism in a cast hybrid metal matrix composite (MMC) was investigated in this research. Conventional three point bending fatigue test was carried out on a rectangular bar smooth specimen. Factographic analysis was conducted to observe the fracture initiation site. Experimental results showed that microcracks in LCF initiated at the particle–matrix interface which was located in the hybrid clustering region. Due to continued fatigue cycling, the interface debonding occurred, created additional secondary microcracks and the microcrack coalesced with other nearby microcracks caused the final fracture.

• Periodical: Applied Mechanics and Materials (Volume 786)
• Pages: 105-110
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.786.105
• Online since: August 2015
• Authors: A.K.M. Asif Iqbal*, Yoshio Arai
• Keywords: Fracture Initiation, Low Cycle Fatigue, Metal Matrix Composite, Reinforcement Clustering

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