It is certain that most engineering materials are partly elastic and partly plastic.

可以肯定，大多数工程材料有几分苏醒也有几分弹性。

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And experiment indicate that, machined parts will occur plastic deformation after lapping, even surface of brittle materials such as ceramics and carbide will deform to a certain degree.

实验还表明研磨加工后，工件表面都产生塑性变形，即使是像陶瓷、硬质合金等硬脆性材料，其表面也存在一定的塑性变形。

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And experiment indicate that, machined parts will occur plastic deformation after lapping, even surface of brittle materials such as ceramics and carbide will deform to a certain degree.

实验还表明研磨加工后，工件表面都产生塑性变形，即使是像陶瓷、硬质合金等硬脆性材料，其表面也存在一定的塑性变形。

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