Abstract：To solve the problem of edge cracks caused by stomatal defects in aluminum alloy 4004 coldrolled sheets during rolling process, the stomatal defects in modeling process were numerically simulated based on gursontvergaardneedleman (GTN) micromechanical damage model. The stomatal defects model 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 05 mm. The closer the distance between blowhole defects and plate surface is, the easier the manufacturing deficiency occurs.
2013, Vol. 34 
