Authors: Sheng Ho Huang Fuang Yuan Huang Biing Hwa Yan
Publish Date: 2004/02/20
Volume: 26, Issue: 1-2, Pages: 68-77
Abstract
Microelectrodischarge machining microEDM is a potential micromanufacturing technology However the surfaces of microcomponents manufactured by microEDM will exhibit microcracks and microcraters and then microcracks and microcraters will produce notch effects leading to stress concentration and reduction of fatigue strength In particular the roughness and size of tiny components strongly affect the strength of microscale components Therefore this study performs microtensile tests for microshaft specimens of various roughness and size to investigate the influence of roughness and size on the fracture strength of micro WCshafts manufactured by microEDM Experimental results indicate that the surface roughness axial surface area volume and length of the specimen affect its fracture strength For specimens of the same size the mean fracture strength decreases as the surface roughness increases and the fracture probability of the specimens also increases roughness effect For specimens with the same diameter and roughness increasing the length volume or axial surface area reduces the mean fracture strength and increases the fracture probability size effect
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