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颗粒增强金属基复合材料具有非均匀的显微组织结构，在切削力作用下其剪切变形不是在一个平面内而是在一个有相当厚度的区域内完成，传统的单一剪切平面模型不适合用于这类非连续增强型复合材料的切削分析．颗粒增强复合材料基体的塑性变形始终受到不可塑性变形颗粒的干扰，故在复合材料成屑过程中裂纹的形成和扩展起重要作用，并由此决定了切屑的基本形态．分析了材料进入剪切变形区后发生的非定向连续滑移、剪断和基本稳定滑移三种情况．
Particulate reinforced metal matrix composites have a non-uniform microstructure. Under shearing force, the shear deformation is not in one plane but in a region with considerable thickness. The traditional single shear plane model is not suitable For such non-continuous reinforced composite cutting analysis. The plastic deformation of the matrix of the particle reinforced composite material is always disturbed by the non-plastic deformation particles. Therefore, the formation and propagation of cracks in the composite material chip formation play an important role and thus determine the basic shape of the chip. The non-directional continuous slippage, shearing and basic stable slippage occurred after the material enters the shear deformation zone are analyzed.