Analysis of contact properties for the asperity based on micro manufacturing process

Lianfeng Lai

Abstract


For the micro manufacturing, friction and wear are actually the sliding compression process of many asperities which are distributed in two contact surfaces. A three-dimensional contact model was established between the tool and the workpiece exhibiting fractal behavior, the contact area was discussed using the finite element analysis. The numerical results showed that the real contact area was mainly concentrated in the higher individual asperities, when the load is low, the real contact area with the load into an approximate linear relationship, with the increasing load, the real contact area slowly increasing since the effect of the interaction of asperity; the contact interface adhesion has significant effect on micro-scale machining process, the interfacial shear strength is lesser, more the difference of the Z direction load less than zero, the asperity is not easy to break. The micro contact model between the tool and the workpiece will lay a foundation to further research on the substance of the process of micro manufacturing.


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