Analytical model for the expansion of tubes under tension
Analytical model for the expansion of tubes under tension
复制标题
DOI：
10.1016/j.jmatprotec.2009.09.024
复制
发表时间：
2010-01
影响因子：
6.3
通讯作者：
A. Karrech;A. Seibi
中科院分区：
文献类型：
--
作者：
A. Karrech;A. Seibi
本文主要研究金属管材在大的径向和周向塑性变形作用下的膨胀问题。这一过程可以通过机械或液压驱动不同直径的刚性锥形芯棒来实现，以获得所需的膨胀比。建立了一个数学模型，用于预测扩径区的应力场、扩径所需的拉拔力以及由此产生的能量耗散，从而获得最佳的芯棒形状。用有限元分析对理论结果进行了验证。对于不同的几何约束和摩擦系数，在拉拔力和耗能方面得到了很好的一致性。研究表明，在较低摩擦条件下，最佳芯棒倾角范围为22~25度，随着摩擦力的增大，最佳芯棒角度呈非线性增加。
This paper focuses on the expansion of metallic tubes subjected to large radial and circumferential plastic deformations. This process can be achieved by driving rigid conical mandrels of various diameters through them either mechanically or hydraulically in order to obtain desirable expansion ratios. A mathematical model was developed to predict the stress field in the expanded zone, the drawing force required for expansion, and the resulting dissipated energy from which optimum mandrel shapes were obtained. A finite element analysis was used to validate the theoretical results. A good agreement was obtained in terms of drawing force and dissipated energy for different geometric constraints and friction coefficients. The study showed that the optimum mandrel angle ranges between 22 and 25 degrees for low friction and increases non-linearly when friction increases.