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采用数值模拟的方法研究了AZ31镁合金板材在轧制过程中板材边部的受力情况,从应变场、应力场、损伤因子等方面分析了宽厚比对边部裂纹的影响规律。结果表明,单道次轧制过程中,损伤因子值小于0.255时,轧制过程中选择宽厚比小于60∶1的板坯可有效控制边部裂纹产生,板坯损伤因子值小于0.139时,轧制过程中宽厚比小于4∶1的板坯可有效控制边部裂纹产生;在其他条件不变的情况下,减小板材的宽度,降低轧板边部所受拉应力,减小边部损伤值,有利于促进板坯变形均匀性;在加工率相同的情况下,随着宽厚比的不断增加,边部沿轧制方向上的应力峰值逐渐累积,心部等效应变场逐渐分成许多较小区域,变形更不均匀,边部损伤因子升高,导致轧件开裂几率提高,边部裂纹数量逐渐增加。
The stress of AZ31 magnesium alloy sheet during the rolling process was studied by numerical simulation. The effect of aspect ratio on the edge crack was analyzed from the aspects of strain field, stress field and damage factor. The results show that when the damage factor is less than 0.255 during single pass rolling, the slab with aspect ratio less than 60: 1 can be controlled effectively during the rolling process. When the damage factor of slab is less than 0.139, During the process, the slab with aspect ratio less than 4: 1 can effectively control the edge cracks. When other conditions remain unchanged, the width of the slab is reduced, the tensile stress on the edge of the rolled strip is reduced, and the edge damage is reduced Value, is conducive to promoting the uniformity of slab deformation; with the same processing rate, along with the increasing ratio of thickness, the peak along the rolling direction of the peak gradually accumulated, the heart equivalent strain field gradually divided into many more Small area, the deformation is more uneven, the edge damage factor increased, leading to the risk of cracking of rolled parts increased, the number of edge cracks gradually increased.