boundary geometry
2.In order to solve the disaccord of color gamut in the course of converting of the color information among different devices, the segment maxima method for calculating gamut boundary descriptors is used to describe the color gamut boundary of color jet ink printer in CIE LAB color space, present an new algorithm combining space analytic geometry to realize the gamut mapping for color jet ink printer, and has been proved it has good practical value.
5.Based on a virtual power principle,a finite element model for multi|point forming is given,in which material,geometry and discontinuous boundary condition have been considered. The method dealing discontinuous dynamic contact boundary condition and coulomb friction boundary conditions is introduced. According to classical J 2 flow theory, a multi|point forming process of square cup is simulated.
6.Secondly ,with the common materials of HDPE and PEEK, the variety conditions of temperature field and the pressure field of melt in the pipe runner are simulated , and the effect rules of velocity and quality of melt and the key geometry parameters of the die runner are confirmed under different geometry parameters and boundary conditions.
8.On the basis of the existing achievement of fracture mechanics and crack technology, with the powerful pre-solution function of ANSYS, the 3D geometry model of impress blade and round bar is set up, 3D FE model is built by means of cut-boundary method, smart mesh and sweep mesh.
9.The cage roll forming process of ERW pipes is quite complicated, which involves geometry nonlinearity, material nonlinearity and boundary nonlinearity. In order to understand the deformation behavior of sheet metals better and avoid product defect, a large deformation elastic-plastic finite element model of ?273mm weld pipe cage forming mill, based on the Updated Lagrangian method, is established and simulated through adopting dynamic explicit algorithm. Roll flower, transverse effective plastic strain, and longitudinal strain of the deformed strip at different forming sections are obtained.
