Abstract
In this work, both AZ91D monolithic and AZ91D/SiCp composites prepared by squeeze casting followed by hot extrusion are tested under fully reversed strain-controlled loading conditions. The effects of SiCp volume fraction (i.e. Vf=0%, 5%, 15%, 25%, and 30%) and the imposed strain amplitude on the strain-controlled fatigue life and properties are examined. Increasing the SiCp content degrades the strain-controlled fatigue properties in the low cycle regime, with a potential benefit in the high cycle regime. The relationship between elastic strain amplitude, plastic strain amplitude and reversals to failure are well described by the Basquin and Coffin–Manson equations, respectively. A comparison made between the monotonic and cyclic stress–strain curves reveals that the reinforcement amount as well as the imposed strain amplitude significantly affects the characteristics of the evolving hysteresis loops.
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