ZHU Yi XU Xiaohe Northeast University of Technology
,
Shenyang
,
China
金属学报(英文版)
Based upon the aspect of continuous damaging,the process of ore comminution may be des- cribed as the growth and propagation of the microcracks in the ore grains under external load- ing,and a theoretical expression has been developed on the relationship between the grain size distribution and the total energy consumption during entire ore comminution process.The en- ergy consumed totally may be considered consisting of two portions,i.e.with fresh crack sur- faces growth and with crack propagation.The proposed expression seems to be an advance over previous conventional ones,especially that from the viewpoint of energy distribution.
关键词:
ore comminution
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null
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null
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null
赵鸿金
,
李涛涛
,
杨正斌
,
贺玲慧
稀有金属
doi:10.13373/j.cnki.cjrm.XY15032802
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.
关键词:
AZ31镁合金
,
数值模拟
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损伤因子
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宽厚比
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边部裂纹
