锻压技术

基于GTN和韧性断裂准则的SS304微管液压胀形开裂研究

英文标题：Study on hydraulic bulging cracking for SS304 micro tubes based on GTN model and ductile fracture criteria

作者：王嵩杰杨晨

单位：南京理工大学

分类号：TG306

出版年,卷(期):页码：2019,44(1):182-188

摘要：

为了提高SS304微管液压成形性能，设计了一种轴向补料液压成形工艺。通过试验并结合GTN损伤模型和韧性断裂准则研究了不同补料量对微管胀破压力和胀形直径的影响规律。试验结果表明，微管胀破压力和胀形直径表现出一定的分散性，并且在0.6~1.5 mm范围内进行轴向进给量补料时，轴向补料方法能够显著提高微管胀破压力和胀形高度。数值模拟结果表明：GTN损伤模型和Ayada准则能较好地模拟轴向补料与胀破压力之间的关系；在0.6~1.5 mm范围进行轴向补料，Brozzo韧性断裂准则预测管件胀形最大直径的效果要优于其他准则。

In order to improve the hydroforming performance of SS304 micro tubes, an axial feeding hydroforming process was designed, and the influences of different axial feeding amounts on the bursting pressure and bulging diameter of micro tubes were studied by the experiment combining with the GTN damage model and the ductile fracture criteria. The experiment results show that the bursting pressure and bulging diameter of micro tubes show a certain degree of dispersion characteristics, and the axial feeding method can significantly improve the burst pressure and bulging height of micro tubes when the axial feeding is performed in the range of 0.6-1.5 mm. The numerical simulation results show that the relationship between axial feeding and bursting pressure are simulated well by the GTN damage model and the Ayada criterion, and the effect of predicting the maximum bulging diameter of tubes by the Brozzo fracture ductile criterion is better than that of other criterias when the axial feeding is performed in the range of 0.6-1.5 mm.

基金项目：

中央高校基本科研业务费专项资金资助项目（30915118808）；江苏省基础研究计划（自然科学基金）面上研究项目（BK2012805）；高等学校博士学科点专项科研基金（20123219120006）

王嵩杰（1990-），男，硕士研究生，E-mail：2808170376@qq.com；通讯作者：杨晨（1976-），男，博士，副教授，E-mail:yangchen@njust.edu.cn

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