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| 1 | Numerical Simulation and Experiments of Hydroforming of Rectangular-section Tubular Component显示文摘In order to reduce high calibration pressure in hydroforming of components with too small radii, a method wasproposed to manufacture automotive hollow components with rectangular shape by relatively lower pressure. Theprocess is simulated and analyzed. It is thought that the friction force between the die surface and tube is a mainreason that high pressure is needed to form small radii. Using the method proposed in this paper, a petal-like sectionshape is first preformed so that the central zones of the four sides of the preform section do not contact with the diesides, thus the tube metal is easy to flow into the transition radii area in calibration stage. Moreover, a positive forcealong the sides is produced by the internal pressure, which is beneficial to overcome the friction force and push thematerial into the radii. Therefore, the pressure for forming the transition radii is greatly reduced and the componentswith small radii can be formed with relatively lower pressure. For the experimental case conducted in this paper, theforming pressure is reduced by about 28.6% than the estimated forming pressure. | Shijian YUAN Gang LIU Xianwei TIAN Z.R.WANG | 2003 | Journal of Materials Science & Technology2003，19，z1： | 5 |
| 2 | A New Ductile Fracture Criterion and Its Application to the Prediction of Forming Limit in Deep Drawing显示文摘With considering the influence of equivalent plastic strain on void-damage and taking Lemaitre damage equivalent stress as plastic potential, based on continuous damage mechanics theory, a new criterion for ductile fracture is derived. The two key material constants in the criterion are determined by the combination of tension tests with FE (finite element) simulation. On the basis of the values of stress and strain calculated from commercial finite element software, the forming limit in cylindrical deep drawing of annealed aluminum alloy LY12(M) is predicted by means of the new ductile fracture criterion. Experiments verify that the predicted results are in agreement with the experimental ones. Hence, it is reliable to predict the forming limit in deep drawing by means of the new ductile fracture criterion. | Yuying YANG Zhongqi YU Xuechun LI Zhenzhong SUN | 2003 | Journal of Materials Science & Technology2003，19，z1： | 3 |
| 3 | Numerical Simulation of Superplastic Forming and Diffusion Bonding of Ti Alloys显示文摘The research on numerical simulation for combinative process of SPF/DB is carried out in this paper. The contacting problem of sheets is analyzed by using the penalty method. In order to solve the contact problem of different parts of the sheet, a new algorithm for contacting judgment is proposed. According to the relation of the distance vector and the vector of contacting element area, and the condition of contact, it can be judged whether or not a node on the slave surface and the corresponding master surface are in the state of SPF/DB. The Mindlin shell element is employed to simulate SPF/DB process of an asymmetry double-cell cup of Ti-6Al-4V to examine the efficiency of the new algorithm using ARVIP-3D. The results of the numerical simulation are in good agreement with experimental results. | Kaifeng ZHANG Wenbo HAN Wei WU Guofeng WANG Dezhong WU | 2003 | Journal of Materials Science & Technology2003，19，z1： | 1 |
| 4 | A Method of Obtaining Deformation Information by Tracing Deformation from Sections for 3D FE Simulation显示文摘With the development of computer technology and finite element method, the priority research area of plasticforming has focused on 3D FE simulation of forming processes for components with complicated geometrical shape.These processes have complex deforming mechanism, and different sections have different deforming characteristics.Therefore, for making a simple, convenient, and practical analysis of its deforming law, how to obtain deformationinformation of key sections from the results of 3D FE simulation has become one of problems urgently to be solved.So, a method of obtaining deformation information by tracing deformation from sections for 3D FE simulation hasbeen proposed. From the deformation information got by this method, the deformation law of key locations and thewhole deforming body can be obtained. This method can also help to compare the result from FE simulation withthat from physical modeling. Key procedures of this method have been presented in detail, and it has been testedby applying to 3D FE simulation of precision forging of the blade with a damper platform. The result shows thatthe method is practicable and reliable, and it can also be applied to 3D FE simulation of plastic forming processes ofother components. | Mei ZHAN He YANG Yuli LIU | 2003 | Journal of Materials Science & Technology2003，19，z1： | 1 |
| 5 | Strain rate sensitivity index's theoretical formulae expressed by experimental parameters and its measurement显示文摘A group of formulae for measuring strain rate sensitivity index is established under the conditions of constant strain rate, constant velocity and constant load. And measuring methods are given corresponding to each kind of experimental curves. Furthermore the experimental results are measured and compared on Zn-wt5%Al alloy at room temperature (18 ℃), which shows that this kind of alloy is structural sensitive even at room temperature. | SONG Yuquan, WANG Xiwen and LIU Ying(Superplastic and Plastic Research Institute of Jilin University, Changchun 130025, China) | 2002 | Progress in Natural Science:Materials International2002，12，6： | 1 |
| 6 | Mechanisms of plastic deformation for powder materials in cold working显示文摘To deal with the discontinuity of particulate media and subsequent uncertainty of stress, based on the probability theory for mechanics of particulate media, Mohr-Coulomb yield criterion of particulate media, and the theory of crystal deformation, we put forward the statistical mechanisms of deformation of powder materials in cold working and mechanism of texture development of the high temperature superconducting wire/tape. A new yield criterion of powder materials is proposed. | 张连洪 李双义 | 2003 | Science China(Technological Sciences)2003，46，4： | 0 |
| 7 | Study on Process Parameters Optimization of Sheet Metal Forming Based on PFEA/ANN/GA显示文摘Sheet metal forming is widely applied to automobile, aviation, space flight, ship, instrument, and appliance industries.In this paper, based on analyzing the shortcoming of general finite element analysis (FEA), the conception of parametric finite element analysis (PFEA) is presented. The parametric finite element analysis, artificial neural networks(ANN) and genetic algorithm (GA) are combined to research thoroughly on the problems of process parametersoptimization of sheet metal forming. The author programs the optimization scheme and applies it in a research ofoptimization problem of inside square hole flanging technological parameters. The optimization result coincides wellwith the result of experiment. The research shows that the optimization scheme offers a good new way in die designand sheet metal forming field. | Juhua HUANG Jinjun RAO Xuefeng LI | 2003 | Journal of Materials Science & Technology2003，19，z1： | 0 |
| 8 | Study on the Deformation Characteristics of the Sheet Hydroforming with a Movable Die显示文摘An improved sheet hydroforming process with a movable die is proposed and investigated by elastoplastic FEM. The effects of varied process parameters on the deformation of the sheet blanks were investigated. The effects of the movable die on the FLD were also analyzed. Using a movable die may increase the forming limit of the blank and improve the forming performance. Moreover, the drawing ratio of the blank may be increased by changing the process conditions such as blank holder force and the counterforce of the movable die on the blank. | Linxin ZHOU Yi XU Zhongtang WANG Shihong ZHANG | 2003 | Journal of Materials Science & Technology2003，19，z1： | 0 |
| 9 | Improving a Laser Machine for Laser Forming of Metals显示文摘Laser forming is a flexible metal forming process without a die. At present, for this innovative process no exclusive equipment is commercially available. In this paper, some improving measures including temperature monitoring system, shape monitoring system, cooling system and rotary segment have been proposed on the basis of the general NC laser machine in order to meet the special requirements for laser forming of metals. The improved laser machine may be conveniently used to control dynamically and record the whole laser forming process of metals. | CHEN Dun-jun1, ZHU Zi-qiang2, LI Miao-quan1, WU Shi-chun1 1Northwestern Polytechnical University, Xi’an 710072, P. R. China 2Shaanxi Technique Supervision Bureau, Xi’an 710048, P. R. China | 2001 | International Journal of Plant Engineering and Management2001，6，1： | 0 |
| 10 | COMPUTER AIDED ANALYSIS FOR COLD ROLL FORMING THIN CHANNEL SECTION显示文摘Cold roll forming is a complicated metal processing, and it is very difficult to simulate the forming process. Based on the Updated-Lagrange method in the deformation me chanics, an elastic-plastic large deformation spline finite strip method is developed to analyze cold roll forming of a thin channel section. The longitudinal membrane strain values on the edge of the deformed strip for four one-pass sequences in different fold angles are got. Simulated restults are compared with the results from previously conducted experiments. The deviation of the simulated peak strain values is within 30% compared with the experimental results. | Z. W. Han ,Y.Q. Nie, L.Q. Ren and C. Liu (Key Laboratory of Terrain Machine Bionic Technology, Jilin University, Changchun 130025, China) (Mechanics Department, Jilin University, Changchun 130025, China) (Institute of Rolling Mill, Yanshan University, Qin | 2001 | Acta Metallurgica Sinica(English Letters)2001，14，2： | 0 |
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