运用热-力耦合有限元法对SiCp/2009Al复合材料进行了热轧模拟, 研究了复杂应力状态下的轧制成型过程、温度场、变形场及应力场分布, 得到了轧制过程中表面和中心区域的温度、应力、应变以及应变率的变化曲线, 从而可以更好地理解复合材料的热轧机理. 模拟结果表明: 在轧制入口处, 最大主应力由压应力向拉应力转变, 与出口处变化规律相反. 在轧制稳定阶段, 变形区的最大主应力则以压应力为主; 轧板表面的热传递温降效应远大于摩擦温升效应, 而轧板中心温度主要由塑性变形温升效应控制; 此外, 在轧制入口和出口处, 应变率对流动应力的贡献起主导作用; 在轧板变形区, 轧板表面的流变应力主要由应变和温度决定, 但表面黏着区是由应变率控制; 轧板中心的流动应力在变形区主要受温度影响.

In this work, the hot rolling process of SiCp/2009Al composites is simulated using the fully coupled thermal-stress analysis in Abaqus/Explicit. By the investigation of formation process for rolling along with different fields of temperature, strain rate, strain and stress and their evolutionary history, the hot rolling mechanisms under complicated stress states is achieved. The results show that the maximum principal stress changes from compressive stress to tensile stress at the stage of rolling entrance and a reverse trend replaces it at the exit, and that the compressive stress is dominant in the deformation zone at the steady rolling stage. The temperature drop effect due to heat transfer is far greater than the temperature rise effect due to friction on the plate surface while the temperature rise is embodied in the center due to plastic deformation. Besides, the effect of strain rate on flow stress plays a leading role at the entrance and exit stage, and the flow stress on the plate surface in the deformation region is mainly determined by strain and temperature except the stick zone which is controlled by strain rate, however, the center flow stress in deformation is mainly affected by temperature.