异步轧制力学条件实验及理论分析

本文利用密栅云纹法结合三次样条函数求导法,通过压剪实验,测量计算出压剪区内应变速率场及应力场。结果表明,水平应变速率及应力沿试件厚向分布不均;上下表面摩擦力大小不等;压剪区内存在着横贯变形区的大剪应力场。利用实验数据回归出异步条件下接触弧的摩擦系数表达式,并结合Nadai斜面压缩金属楔解建立了新的异步轧制压力模型。新模型与实际吻合较好。

An Experimental Study and Theoretical Analysis on the Asymmetric Rolling Mechanics Condition

By means of the dense grid moire and the derivation with the third power spline function, the strain rate fields and the stress fields were obtained through a shearing compression experiment. Using the experiment data, the upper and lower surface friction factor functions s were gained. A new model was developed by Nadai's calculation of stres field in a coverging wedge-shape symmetricl channel and was compared with the Others' calculations. It is shown that the results of the new model agree well with those measured in the test.