介绍了一种实现筒形类零件二次拉伸的简易模具结构，为类似零件的生产制造提供参考。
A kind of simple die structure which can realize the re-drawing of barrel-shape parts is introduced, which can be referenced by similar parts manufacture.
分析了小圆角圆筒件的成形工艺性，利用成本较低、塑性较差的角料，采用一次冲压工序完成二次拉伸的复合模。
Adopting once punching process and using fewer cost and worse plasticity leftover material finish twice drawing of compound die.
研究结果表明，混凝土早期自收缩大小与相应的极限拉伸应变具有显著的二次曲线关系；
Research results show that the relationship between autogenous shrinkage at early ages and ultimate tensile strain can be approximately figured by a quadric equation.
表明口模拉伸过程中既存在应力诱导的结晶过程，又存在温度诱导的二次重结晶过程。
It is showing where is either the crystallizing process by the stress introducing or secondary crystallizing process by the temperature introducing.
经C路径的二次ECAE加工后试样为各向同性材料，其缺口冲击强度较PP有所提高，拉伸强度下降，断裂伸长率提高，表现出很好的延伸性。
The specimen by route C ECAE processing was isotropic and its impact strength increased, tensile strength decreased, elongation at break improved and show…
经C路径的二次ECAE加工后试样为各向同性材料，其缺口冲击强度较PP有所提高，拉伸强度下降，断裂伸长率提高，表现出很好的延伸性。
The specimen by route C ECAE processing was isotropic and its impact strength increased, tensile strength decreased, elongation at break improved and show…
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