双金属复合管旋压成形力学原理及有限元分析.docxVIP

双金属复合管旋压成形力学原理及有限元分析 SPIN FOＲMING MECHANICS PＲINCIPLE OF BIMETAL COMPOSITE PIPE AND FINITE ELEMENT ANALYSIS 徐文斌＊＊ 陆晓峰 ( 南京工业大学 机械与动力工程学院，南京 211816) XU WenBin LU XiaoFeng ( College of Mechanical and Power Engineering，Nanjing University of Technology，Nanjing 211816，China) 摘要 基于弹塑性力学理论，阐述了双金属复合管旋压成形过程的力学原理，并获得旋压过程中内外管之间残余接 * 触压力最大时的最优径向应力 Pi * 、压头直径 D 以及进给率 f。根据内管外壁和外管内壁周向应变的变形协调关系，确 定径向应力 Pi 和残余接触压力 Prc 之间的关系。在计算出的理论参数条件下，采用非线性有限元分析软件 Abaqus 对复 合管旋压成形过程进行模拟，模拟结果表明理论分析的准确性，从而为实际生产提供理论参数依据。 关键词 双金属复合管 旋压成形 残余接触压力 进给率 数值模拟 中图分类号 TH123. 4 Abstract Based on elastic-plastic mechanics theory，the mechanics principle of bimetal composite pipe formed by spinning * was expounded，and the optimal radial stress Pi ，die diameter D and feed rate f were acquired when residual contact pressure Prc of inner-outer pipe was the largest． According to the deformation compatibility relation of circumferential strain between the * outer wall of inner pipe and the inner wall of outer pipe，the relationship between optimal radial stress Pi and residual contact pressure Prc was obtained． With the calculated theoretical parameters，the nonlinear finite element analysis software Abaqus was used to simulate the spinning process of composite pipe． The simulation result shows the accuracy of the theoretical analysis， which could provide the theoretical parameters for actual production and has important engineering practical significance． Key words Bimetal composite pipe; Spin forming; Ｒesidual contact pressure; Feed rate; Numerical simulation Corresponding author: XU WenBin，E-mail: xuwenbin1987@ 126． com，Tel: + 86-25Fax: + 86-25Manuscript receivedin revised form 引言 现代石油化工等行业对管道的要求越来越高，不 仅要求高强度，还要求具有良好的腐蚀性能等。虽然 通过添加合金元素和热处理等手段可以提高或改善管 道材料的某种性能，但是添加昂贵而稀有的合金元素 并不总是能得到所需要的综合性能，而且有的金属材 料随着合金含量的增加，其价格也大大提高。双金属 复合管正是为了满足上述要求而诞生的。双金属复合 管［1］是由两种不同的金属管材构成，一种管材在内， 另一种管材在外，管层之间通过各种复合方法