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Viscous Inner and Outer Pressure Forming Method of Thin-walled Tube and Its Application高铁军1,LIU Yang1,WANG Zhongjin21. Faculty of Aerospace Engineering, Shenyang Aerospace University2. School..., the limit deformation of tube part can be increased by several times. Meanwhile, the principle of viscous inner and outer pressure forming was provided, and key problems during the forming process......
Article ID: 1003-6326(2005)05-1040-05 Finite element analysis of free expansion of aluminum alloy tube under magnetic pressure YU Hai-ping(于海平), LI Chun-feng(李春峰) (School of Materials Science... modeling of electromagnetic forming for aluminum alloy tube expansion was performed by means of them (discharge energy 0.75kJ). A realistic distribution of magnetic pressure was calculated......
Deformation behaviors of 21-6-9 stainless steel tube numerical control bending under different friction conditionsFANG Jun(方军)1, LU Shi-qiang(鲁世强)2, WANG Ke-lu(王克鲁)2, YAO Zheng-jun(姚正军)1(1. Institute..., Nanchang 330063, China)Abstract:For contact dominated numerical control (NC) bending process of tube, the effect of friction on bending deformation behaviors should be focused on to achieve precision......
Determination and application of stress-based forming limit diagram in aluminum tube hydroforming ZHOU Lin (周林), XUE Ke-min (薛克敏), LI Ping (李萍) School of Materials Science and Engineering, Hefei... in tube hydroforming. The results indicate that the fracture often occurs in the transition region between corner and straight side of the tube, and the limit forming pressure is 46.4 MPa......
Effect of internal pressure on microstructure of tube shear hydro-bending of 5A02 aluminum alloysHAN Cong, WANG Yong, XU Yong-chao, YUAN Shi-jian(School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)Abstract:In order to study the effect of shear deformation on microstructure, the formed shear hydro-bent tube of aluminum alloy was investigated by using......
Deforming mechanism of non-mandrel drawing process of circular aluminium tube by simulation QUAN Guo-zheng(权国政), ZHOU Jie(周 杰), WANG Meng-han(王梦寒), QUAN Guo-hui(权国辉), TONG Ying(佟 莹) College... be designed to ensure tube precision. The dynamic model and elasto-plastic finite element model of the forming process were established based on FEM software Deform-3D, then the simulation was performed......
管材自由胀形时胀形区轮廓形状的影响因素林艳丽1,何祝斌1,苑世剑1(1.黑龙江省哈尔滨市哈尔滨工业大学材料科学与工程学院)摘 要:基于中间自由胀形区为椭圆形轮廓线的假设,对管材自由胀形过程进行了理论分析,研究了影响椭圆形状的主要因素及其对测试结果的影响.结果表明,影响椭圆形状的主要因素是管材胀形区长度和约束模具圆角半径.在其它条件一定时,椭圆的长短半轴比值随管材胀形区长度的减小或约束模具圆角半径的增大而减小,即管材胀形后的轮廓线形状从椭圆形逐渐变化为圆形然后又变为扁椭圆形.由胀形实验所得的应力-应变曲线随胀形区......
Failure Behavior of Thermal Barrier Coatings on Cylindrical Superalloy Tube Under Thermomechanical FatigueZhubing CHEN1,2,Zhongguang WANG2,Shijie ZHU31. Shenyang Aeroengine Research Institute... Institute of Technology摘 要:Failure behavior of thermal barrier coatings on cylindrical superalloy tube was investigated under thermomechanical fatigue(TMF......
Application of Low-penetration Concrete as the Protecting Layer in Wuhan Yangtse River Tunnel Tube杨雷摘 要:<正>Based on the Wuhan Yangtse River Tunnel Project, the low-penetration fiber concrete used in the protecting layer of Wuhan Yangtse River Tunnel tube has been studied in this paper. With the effect of silica fume, slag and polypropylene fiber......
线性方程组,需要借助多次迭代求解,无法给出临界失稳压力的解析表达式,不适合工程应用中起皱规律的探讨研究.本文作者为探求管材材料性能和成形几何条件等主要参数对缩径成形过程中弹塑性失稳的影响规律,忽略管材初始缺陷的影响. 图1 管坯外压缩径原理图 Fig. 1 Schematic diagram of tube outer pressure compression... preparation (Unit: mm) 拉伸试验测定得到的试件真实应力-应变曲线见图8.材料在两种不同热处理条件及上述拉伸条件下的本构关系按幂指函数模型式(15)拟合后的本构方程参数K,n以及拟合精度均方差见表1. 图8 AA7075管材真实应力-应变曲线 Fig. 8 Axial true stress-strain curves of AA7075 tube 表1......
