【摘要】 基于率相关晶体塑性理论，建立纯铜微细线材拉拔变形晶体塑性有限元模型，研究线径压缩率对线材拉拔过程中细观力学变形行为的影响。结果表明，经过拉拔的线材内部变形和滑移均呈不均匀分布状态，形成明显的滑移区和非滑移区，在拉拔线材内部产生了水平应变集中带。随着线径压缩率的增大，拉拔变形区线材内部的滑移系强度和滑移区域面积均逐渐增大。然而，线材拉拔变形区的接触压力和摩擦应力所引起的线材表面波动性受力状态使拉拔成形后的线材表面粗糙不平、拉拔过程平稳性降低。更多还原

【Abstract】 A crystal plasticity finite element model was developed for the drawing deformation of pure copper micro wire, based on rate-dependent crystal plasticity theory. The impact of wire diameter compression ratio on the micro-mechanical deformation behavior during the wire drawing process was investigated. Results indicate that the internal deformation and slip of the drawn wire are unevenly distributed, forming distinct slip and non-slip zones.Additionally, horizontal strain concentration bands develop within the drawn wire. As the wire diameter compression ratio increases, the strength of the slip systems and the extent of slip zones inside the deformation zone also increase.However, the fluctuating stress state, induced by contact pressure and frictional stress, results in a rough and uneven wire surface and diminishes the stability of the drawing process.更多还原