共查询到19条相似文献,搜索用时 109 毫秒
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环件轧制过程的显式有限元模拟分析 总被引:7,自引:0,他引:7
用于金属成形进行模拟的有限元方程的求解方法,主要有隐式和显式积分两种方法。对于复杂的三维变形分析,如环件轧制,隐式方法需要很长的运行时间。而利用显式方法,可以达到很好的效果。文中利用Abaqus/Explicit通用有限元程序对径向环轧进行了模拟。 相似文献
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轿车侧挡玻璃弯曲回弹的有限元仿真 总被引:1,自引:0,他引:1
介绍了轿车侧挡玻璃落模弯曲成形中回弹的机理,建立了有限元模型。利用显式动力算法和隐式静力算法分别对轿车玻璃的落模弯曲和回弹变形进行了数值模拟,采用细分网格保证模拟精度,研究了模具环弯曲半径、玻璃落模高度和加热温度等工艺参数对弯曲回弹的影响,为实际生产提供参考依据。 相似文献
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环件热轧动态过程有限元模拟 总被引:10,自引:1,他引:9
本文采用刚粘塑性动力显式有限元方法模拟了环件热轧时的金属流动规律。模拟结果揭示出环坯形状、尺寸,温度和轧制加载速度对工艺性指标和效率性指标的影响 相似文献
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板料冲压成形和回弹分析过程的三维动态模拟 总被引:6,自引:0,他引:6
利用ANSYS/LS-DYNA非线性动力有限元程序的显式-隐式连续求解功能,模拟了板料成形过程与卸载后板料回弹变形的全过程,得到了成形过程中任一时刻各处的应力和应变值及卸载后板料的回弹结果。 相似文献
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板料厚度对冷弯成型及回弹影响的模拟研究 总被引:1,自引:0,他引:1
使用ANSYS/LS-DYNA有限元软件的显式求解功能对厚度为4~8mm的板料进行有限元弹塑性分析,得到了板料成型过程中厚度因素对轧件应力、应变的影响规律。接着利用ANSYS的隐式求解功能分析了厚度因素对板料回弹的影响规律,并将回弹量的模拟数值与工作现场的回弹数值进行比较,表明计算结果具有一定的可信度。 相似文献
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环轧过程控制的关键技术之一是轧制载荷的控制,轧制载荷与压力辊的进给速率密切相关,并随环件的尺寸、材料性能和轧制规程变化。本文探讨了基于动力有限元模拟的环轧过程控制策略,论述了刚粘塑性动力显式有限元的基本方法,以及环轧过程有限元模拟程序H-RING。介绍了一种环轧过程最优控制器的设计方法,该控制器可以使压力辊按要求的进给速率运动。 相似文献
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动态有限元模拟与环轧控制策略 总被引:2,自引:0,他引:2
环轧过程控制的关键技术之一是轧制载荷的控制,轧制载荷与压力辊的进给速度密切相关,并随环件的尺寸,材料性能和轧制规程变化,本文探讨了基于动力有限元模拟的环轧过程控制策略,论述了刚粘塑性动力显式有限元的基本方法,以及环轧过程有限元模拟程序H-RING。介绍了一种环轧过程最优控制器的设计方法,该控制器可以使压力辊按要求的进给速度运动。 相似文献
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Chunlei Xie Xianghuai Dong Shangjian Li Shuhuai Huang 《International Journal of Machine Tools and Manufacture》2000,40(1):81
A generalized energy functional describing rigid–viscoplastic dynamic deformation is newly proposed. The Lagrangian multiplier method and the penalty method are introduced to enforce the incompressibility condition into the functional, respectively. The rigid–viscoplastic dynamic explicit finite element equation is established by employing the functional, in which the penalty method is used to remove the restraint of incompressibility. Then the rate-type explicit time integration formulation is given by the central difference method. A rigid–viscoplastic dynamic explicit finite element code, H-RING, is developed for the analysis of ring rolling. The discussion is mainly focused on an investigation of the cause and elimination of fishtail defect in rectangular section ring rolling and the strain distribution in L-section profiled ring rolling. The constraint of guide rollers is also introduced into the calculation. The numerical analysis results are in good agreement with experiments in terms of geometrical changes and in load variation. 相似文献
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In this article, the elastic-plastic finite element formulations using dynamic explicit time-integration schemes are proposed
for numerical analysis of automotive body panel stamping processes. A general formulation of finite element simulation for
complex sheet forming processes with arbitrarily shaped tools is briefly introduced. In finite element simulation of automotive
body panel stamping processes, the robustness and stability of computation are important requirements since the computation
time and convergency become major points of consideration besides the solution accuracy due to the complexity of geometry
and boundary conditions. For analyses of more complex cases with larger and more refined meshes, the explicit method is more
time effective than the implicit method, and it has no convergency problem and has the robust nature of contact and friction
algorithms, although the implicit method is widely used because of excellent accuracy and reliability. The elastic-plastic
scheme is more reliable and rigorous, while the rigid-plastic scheme requires short computation time. The performance of the
dynamic explicit algorithms is investigated by comparing the simulation results of forming of complex-shaped automotive body
parts, such as a fuel tank and a rear hinge, with the experimental results. It has been shown that dynamic explicit schemes
provide quite similar results to the experimental results. It is thus shown that the proposed dynamic explicit elastic-plastic
finite element method enables an effective computation for complicated automotive body panel stamping processes. 相似文献
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M. J. Finn P. C. Galbraith L. Wu J. O. Hallquist L. Lum T. -L. Lin 《Journal of Materials Processing Technology》1995,50(1-4):395-409
LS-DYNA3D, an explicit code, and LS-NIKE3D, an implicit code, have been coupled to facilitate the finite element (FE) modelling of sheet metal forming. The explicit FE code is used to model the forming process, in which the deformable blank contacts rigid tools. The implicit FE code is used to model the subsequent spring-back which occurs after the tooling is removed. In this way, the explicit code with its robust handling of contact during forming is combined with the implicit code and its large time steps during spring-back. The result is an efficient method for solving even very large (>20 000 deformable elements) sheet forming models. Three examples of the application of this method are given. 相似文献
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