摘要
针对4004铝合金冷轧板材在轧制过程中因气孔缺陷而产生轧制裂边、断带的问题,基于gurson-tvergaard-needleman(GTN)细观损伤模型,对冷轧板成型过程中的气孔缺陷进行了模拟计算.建立了板材轧制中气孔缺陷模型,分析了气孔缺陷的分布、形貌、尺寸、缺陷及其周围区域的应力场、应变场及临界孔洞体积分数的变化,探讨了轧板气孔缺陷的演变规律.结果表明:椭球形的气孔缺陷较球形的气孔缺陷在冷轧成型中更容易产生加工缺陷;半径大于0.5 mm的气孔缺陷,其周围容易产生附加拉应力,易产生裂边、断带缺陷;气孔缺陷在距离板材表面越近处产生加工缺陷的几率越大.
To solve the problem of edge cracks caused by stomatal defects in aluminum alloy 4004 cold- rolled sheets during rolling process, the stomatal defects in modelling process were numerically simulated based on gurson-tvergaard-needleman （GTN） micromeehanieal damage model. The stomatal defects mo- del of rolling process was established to analyze the distribution, morphology and size of stomatal defects and the variation of stress field, strain field and void volume fraction of stomatal defects and surrounding region. The evolution law of stomatal defects was also discussed. The results show that the ellipsoidal blowhole defects are easier to produce manufacturing deficiency than spherical defects. There can easily generate incidental tensile stress, edge crack and strip break around the blowhole defects with radius greater than 0.5 ram. The closer the distance between blowhole defects and plate surface is, the easier the manufacturing deficiency occurs.
出处
《江苏大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第5期589-593,共5页
Journal of Jiangsu University：Natural Science Edition
基金
黑龙江省自然科学基金资助项目(E201028)
关键词
气孔缺陷
冷轧板
损伤演化
GTN细观损伤模型
数值模拟
stomatal defect
cold-rolled sheet
damage evolution
GTN-micromechanical damagemodel
numerical simulation
