1. Based on the result of visioplasticity test,the law of tube central upsetting was created,and the calculated method of displacement field and strain field were obtained.
   根据管坯视塑性实验法的实验结果,分析了无芯轴支撑条件下,管坯中部镦锻的变形规律,阐述了变形区位移场、应变场的计算方法;

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