旋压成形损伤断裂缺陷预测研究进展

薄壁构件旋压成形中经常出现构件破裂的现象,给生产制造带来了巨大的经济损失。主要综述了旋压成形中破裂预测的研究进展及破裂预测的损伤模型的发展概况,并结合笔者的研究经历将不同损伤模型耦合到各向异性Barlat89屈服准则中,通过半隐式图形返回算法进行数值化,来实现应力、应变和损伤值等变量的更新。然后将不同断裂模型应用于各向异性2219-O铝合金剪切旋压破裂的预测,获得了不同断裂模型预测损伤值偏离其阈值不同程度的原因。最后展望了旋压成形破裂预测中仍然存在的难题和挑战。

Research Progress on Fracture Prediction in Spin-forming

Fracture of thin-walled components often occurs in the spin forming, bringing huge economic losses to production and manufacturing. The research progress for fracture prediction in spin forming and the development of damage models for fracture prediction were reviewed. Combined with the author''s research experience, different damage models were coupled into the anisotropic Barlat 89 yield criterion. The semi-implicit graph returning algorithm was numerically implemented to update variables such as stress, strain and damage values. Then, different fracture models were applied to fracture prediction in shear-spinning of anisotropic 2219-O aluminum alloy and the reasons for deviation from their threshold values were obtained. Finally, the difficulties and challenges of fracture prediction in spin forming were prospected.