| Summary: | 碩士 === 國立中央大學 === 機械工程學系 === 104 === This study aims to explore experimentally the influence of ultrasonic vibration on equal channel angular extrusion (ECAE).The ultrasonic system divided in axial direction, lateral direction and both two direction. Use the maximum forming force, maximum total energy and average forming force to compare the effects of ultrasonic vibration.
In this paper, applying ultrasonic vibration in tensile test. Establish material plastic stress - strain relationship with ultrasonic vibration. Also in Deform-3D finite element software to analyze the equal channel angular extrusion(ECAE) that applied with the ultrasonic vibration.
The experimental results shows that ultrasonic vibration on ECAE, whether in axial direction, lateral direction or simultaneous biaxial loading, for lower forming force and enhance the hardness of the specimen both have good effect. Using the finite element to analyze, adjust the contact conditions and material properties of finite element model to build the equivalent model. Putting forward the acoustic softening and friction reduction are both may exist in process of ultrasonic vibration on ECAE.
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