杨合
主要从事精确塑性成形先进理论与技术及其建模、计算机仿真的研究与教学工作,在不均匀塑性变形力学理论与精确塑性成形规律,精确塑性成形过程建模、仿真及优化,薄壁轻量化构件精确成形先进技术等研究方面取得重要进展。
个性化签名
- 姓名:杨合
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学术头衔:
博士生导师
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学科领域:
材料合成与加工工艺
- 研究兴趣:主要从事精确塑性成形先进理论与技术及其建模、计算机仿真的研究与教学工作,在不均匀塑性变形力学理论与精确塑性成形规律,精确塑性成形过程建模、仿真及优化,薄壁轻量化构件精确成形先进技术等研究方面取得重要进展。
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896
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成果数
15
【期刊论文】Wrinkling Limit Based on FEM Virtual Experiment During NC Bending Process of Thin-walled Tube
杨合, H. Li, a, H. Yang, b, M. Zhan, c, L.G. Guo, b and R.J. Gu
Materials Science Forum Vols. *** (2004) pp. 498-502,-0001,():
-1年11月30日
A definition of forming limit is given with minimum centerline radius min R before wrinkling for NC bending process of thin-walled tube. Based on the developed FEM wrinkling prediction system TBWS-3D, an effective searching algorithm of wrinkling limit is proposed and forming limit can be obtained conveniently. Thus influence laws of main forming parameters on wrinkling limit are investigated and revealed. Measures to improve forming limit is put forward consequently. The achievements may help to both practice of thin-walled precise tube bending and research of plastic wrinkling.
Wrinkling,, Wrinkling limit,, FEM,, Thin-walled tube,, NC bending
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【期刊论文】Some advanced plastic processing technologies and their numerical simulation
杨合, H. Yang*, M. Zhan, Y.L. Liu, F.J. Xian, Z.C. Sun, Y. Lin, X.G. Zhang
Journal of Materials Processing Technology 151(2004)63-69,-0001,():
-1年11月30日
The development of aero-space, automobile, and high-technology industries requires the development of advanced plastic processing technologies in order to manufacture parts with light weight, high strength, high precision, high efficiency and at low cost, with a short period and a friendly environment, and with intellectualization and digitization. There are key problems urgently to be solved in the research and development of advanced plastic processing technologies, and FEM numerical simulation in combination with physical modeling and theoretical analysis has been playing a more and more important role in this field. This paper reports the state-of-the-art of some advanced plastic processing technologies and their numerical simulation in the authors'laboratory, including the unequal deforming and in-plane bending process of strip metal, free deformation under dieless constraint and axial compressive precision forming process of tube, wrinkling and spring-back prediction and the NC bending precision forming process of thin-walled tubes, and precision forming laws and a complicated massive forming process such as blade forging with a damper platform.
Advanced plastic processing technology, Numerical simulation, Unequal deformation, In-plane bending, Free deformation, Tube forming
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杨合, M. Zhan, a, H. Yang, b and Y.L. Liu, c
,-0001,():
-1年11月30日
Research on precision forming laws of complicated blade has been a challenging issue on international frontiers of plastic forming areas. The precision forging laws of the blade with a damper platform have been obtained by using 3D FE simulation and physical modeling. The laws involve in the deforming characteristics of the tenon, damper platform, middle blade body, and tip blade body, such as the unevenness of deformation and material flow, the branch-flow of material, material flow characteristic of the blade body and rotation forming characteristic of the damper platform. The research may serve as a guide to the optimization design of relevant process and dies.
Blade with a damper platform,, Precision forging,, 3D FE simulation,, Physical modeling
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53浏览
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240下载
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杨合, J.H. Liu, H. Yang, Y.Q. Li
Journal of Materials Processing Technology 129(2002)326-329,-0001,():
-1年11月30日
In this paper, based on the establishment of a reasonable mechanics model for a typical draw-spinning, research on the first pass of the spinning process is carried out with an elasto-plastic FEM method. The distributions of the stress and strain are obtained under three types of roller-trace curves: straight lines. involute curves and quadratic curves. The distribution laws of the radial and tangential stress that are obtained can serve as a significant guide to determining the forming limits in multi-pass conventional spinning under different roller-traces. Comparison of the distributions of strain and stress of three roller-traces could provide a theoretical basis for selecting a reasonable roller-trace in multi-pass conventional spinning.
Multi-pass conventional spinning, Roller-traces, Stress and strain distributions, Numerical simulation
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43浏览
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148下载
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【期刊论文】Prediction of Grain Size for Blade Precision Forging Process under Thermo-Mechanical Coupling
杨合, He YANG†, Yuli LIU, Wang CAI and Mei ZHAN
J. Mater. Sci. Technol., Vol. 19 Suppl. 1, 2003,-0001,():
-1年11月30日
Blade precision forging is a high temperature and large plastic deformation process. Interaction of deformation and heat conduction results in producing large temperature unevenness inside the billet. The unevenness has a great effect on the mechanical property and microstructure of the forged blade. However. internal quality of the blade is decided by its microstructure, it iS necessary to conduct a research on the microstructure of the blade forging process. Taking a blade with a tenon as an object, its precision forging process is simulated and analyzed using a 3D coupled thermo-mechanical FEM code. And based on the prediction modeI of Ti-6AI-4V presented by the predecessor. a study of the evolution of grain size in the forging process is made. The distribution characteristics of grain size in typical sections are obtained under various deformation degrees. This study may provide a base for designing the blade forging process and working out its parameters.
Blade,, Precision forging,, Grain size,, Prediction
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66浏览
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124下载
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【期刊论文】Wrinkling analysis for forming limit of tube bending processes
杨合, He Yang*, Yan Lin
Journal of Materials Processing Technology 152(2004)363-369,-0001,():
-1年11月30日
Thin-walled tube bending processes may produce a wrinkling phenomenon if the process parameters are inappropriate, especially for tubes with large diameter and thin wall thickness. How to predict this phenomenon rapidly and accurately is one of the urgent key problems to be solved for the development of this process at present. In this paper, a wrinkling wave function is proposed and a simplified wrinkling prediction model to predict the minimum bending radius for tubes is established based on thin-shell theory, forming theory, the energy principle and wave function. The minimum bending radius calculated according to the method established is in agreement with data reported in the literature. Furthermore, effects of parameters on the minimum bending radius are also analyzed: (1) the influence of bending angle on the minimum bending radius is negligibly small; (2) the effect of geometrical dimensions and material properties of tubes on the minimum bending radius is significantly large; (3) the minimum bending radius becomes larger with the original radius and strength coefficient of tubes increasing, whereas with the wall thickness and strain hardening exponent decreasing. The results are helpful to the design and optimization of the relevant processes in practice.
Tube bending, Wrinkling, Forming limit, Energy method, NC
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65浏览
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1167下载
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【期刊论文】Instable modes of in-plane bending of strip metal under unequal compressing
杨合, He Yang*, Xian Feijun, Xiao Hongsheng
Journal of Materials Processing Technology 99(2000)197-201,-0001,():
-1年11月30日
The in-plane bending of a strip metal workpiece under unequal compression can be developed into an advanced precision forming process with high quality, high ef
Unequal compression, In-plane bending, Instable modes, Conical rollers, Strip metal
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50浏览
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446下载
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杨合, Z. Sun, H. Yang *
International Journal of Machine Tools & Manufacture 42(2002)15-20,-0001,():
-1年11月30日
Tube axial compressive precision forming including free deformation can be developed into an advanced precision forming process with high quality, high efficiency, low consumption, good flexibility for size changes. However, the mechanism of free deformation existing in the process is complicated and is hard to study with theoretical analysis and experimentally and there has not been sufficient research of the process. In this paper based on an analysis of deformation modes, a rigid-plastic finite element model of forming process is established and some key technology problems related to the simulation are resolved. A corresponding finite element simulation system was then developed. Experiments carried out show that the system developed is reliable and can be used for a further and systematical study of the tube axial compressive precision forming process. All rights reserved.
Tube forming, Tube axial compressing, Precision forming, FEM simulation, Free deformation
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41浏览
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436下载
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杨合, He Yang*, Mei Zhan, Yuli Liu
Journal of Materials Processing Technology 122(2002)45-50,-0001,():
-1年11月30日
A blade with a damper platform, with excellent anti-vibration characteristics and high efficiency, has become one of the most important new types of blade being developed in the aeronautical engine. However, the blade is complicated in shape, and the material used for its manufacture is difficult to deform. Therefore, it is important to undertake research on the blade-oriented precision forging process using threedimensional finite element method (3D FEM) method numerical simulation for the practice and the development of the process. However, up to now, literature on such research has been scant. In this paper, based on the rigid–viscoplastic principle, three-dimensional finite element simulation is reported for the isothermal precision forging of the blade using the penalty function, and eight-node hexahedral isoparameteric elements for discretizing the deforming workpiece and triangular elements for discretizing the die cavity. The method of contracting from the boundary to the interior, proposed by the authors, is used for remeshing a distorted mesh system, and the method of modifying the position of nodes touching the die according to its original normal, also proposed by the authors, is used to avoid the "dead lock" problem due to the normal uncontinuity of scatted die meshes, to enable the simulation to be successful. Friction is considered for the die-workpiece interface boundary condition, and an arc is considered for the tenon-body joint, and a damper platform-body joint on the blade die cavity, respectively, which make it possible for the simulation to approach the practical forging process of a blade with a damper platform. 3D FEM simulation results have been obtained for the initial and deformed configurations, the deformed meshes of typical cross-sections, the distribution of effective strain at the final stage, load–displacement curves, in this way the deformation law of the forging of a blade with a damper platform being revealed. The achievements of this research serve as a significant guide to the optimization of design for the relevant process and dies. The method used is also of general significance to the forging processes of other type of blades and other complicated massive deformation processes.© 2002 Elsevier Science B.V. All rights reserved.
Blade with a damper platform, 3D FEM, Rigid-viscoplastic, Isothermal forging, Precision forming
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73浏览
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739下载
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【期刊论文】Process optimization of the inverting-forming of thin-walled tubes with radiused dies
杨合, Yang He*, Li Shunping
Journal of Materials Processing Technology 52(1995)489-495,-0001,():
-1年11月30日
The process optimization of the inverting-forming of a thin-walled tube, when a radiused die is used for the process, involves identifying the optimum value of the radius. This paper explores an optimization design of the process from the viewpoint of the deformation force to identify the optimum radius, allowing for the effects of thickness variation, strain hardening, normal anisotropy, and friction. After taking the minimum of the deformation force and the radius limits as the objective function and the critical equations respectively, an optimization model of the process is established, and an optimization algorithm based on the computer simulation of the process is presented, the program for which can be run on a personal computer. The results show that the process optimization is good: an optimized process not only minimizes the deformation force and make the inverting forming progress steady, but also prolongs the die life and improves the quality of the part.
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480下载
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