Certain plastic materials, such as cellulose acetate, which is used for photographic film, are called thermoplastic materials.
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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。
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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