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中文摘要：
基于位错机制的应变梯度（MSG）塑性理论,采用任意拉格朗日-欧拉ALE算法,建立了铝合金介观尺度切削过程的仿真模型,并通过试验对仿真模型进行了验证。结果表明：PCD刀具切削铝合金的最小切削厚度大致为刀具钝圆半径的0.25~0.3倍;材料应变梯度的存在使得材料表现出强烈的尺度效应,并且使单位切削力随着进给量的减小明显增大。
英文摘要：
Based on the Mechanism-based Strain Gradient（MSG） plasticity theory, a modle for the meso-scale cutting process is built and verified by the experiments. Using an Arbitrary Lagrangian-Eulerian（ALE） adaptive meshing technique. The results show that minimum chip thickness is proposed to be about 0.25 to 0.3 times as big as tool edge radius for meso-scale cutting of aluminum alloy by PCD tools. The strain gradient are found to be the main cause of the size effect of meso-scale machining and the specific cutting force significantly increases as the feed decreases.
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