管的高压扭转成形工艺的数值模拟与研究

Numerical Simulation and Research of High-pressure Tube Twisting Molding Process

管的高压扭转成形是一种制备超细晶材料的新技术,也是近年来比较受关注的一种剧烈塑性成形方法。研究了在二维状况其余条件均相同的情况下,试样厚度对试样应变的影响。经数值模拟的结果与分析得出管状试样等效塑性应变由试样内圈到外圈逐渐减小的规律,并得出壁厚不是试样应变的关键因素。在一定的壁厚下影响试样材料应变的关键因素是试样的平均半径,平均半径越大则试样的应变也就越大。

High-pressure tube twisting is a new kind of material technology by making ultra-fine grained metal and this technology is a kind of severe plastic deformation processes which was concerned in recent years.For better understanding of the method of strain change mechanism,how the thickness of the sample influent the strain of sample in the same conditions of the two-dimensional situation was mainly studied.Numerical simulation results and analysis obtains that tubular specimens total equivalent plastic strain reduces gradually from sample inner ring to the outer ring,and the thickness is not the key factors to the strain of sample.The most critical factors is the average radius of the sample in the condition of the same thickness,the strain increases with the average radius increasing.