弹性范围，塑料范围（当材料以不变的应力流动时），应变硬化范围和发生颈缩现象以其断裂终止的范围。
The elastic range, the plastic range (during which the material flows at a constant stress), the strain-hardening range, and the range during which necking occurs, terminating in fracture.
同时，对颈缩阶段中有关力学现象进行了简要的描述。
At the same time, some mechnical phenomena at necking stage are concisely described.
这种局部变薄现象叫做腰缩或颈缩。
这种局部变薄现象叫做腰缩或颈缩。
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