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论文作者:代写留学生论文论文属性:硕士毕业论文 thesis登出时间:2011-05-06编辑:zn1987点击率:4080
论文字数:3431论文编号:org201105061318244131语种:英语 English地区:加拿大价格:$ 66
关键词:Silicone rubberVulcanization processNumerical simulation
Investigation of computer-aided engineering of silicone rubber vulcanizing (II)—finite element simulation of unsteady vulcanization field
Abstract
On the basis 代写留学生论文 of construction of the mathematical model of vulcanization ratio and numerical calculation of crosslinking structure parameters and derivation of the control equation of temperature field, two-dimensional space is divided in the manner of triangular element, then the interpolating function is calculated. Thereafter, the calculation of the element variation and collectivity synthesis is done, and the procedures of the numerical simulation of vulcanization process are described in detail. Finally, the computer-aided engineering software of silicone rubber vulcanizing is designed. The rationality of the simulation theory is verified by hardness test and analytical test. 2002 Elsevier Science Ltd. All rights reserved.
Keywords: Silicone rubber; Vulcanization process; Numerical simulation
1. Introduction
When liquid silicone rubber is used as mould material and rapid prototype such as LOM prototype is used as master model of vulcanization, the rapid tooling technology can greatly reduce production cost and shorten production period. So the technology becomes one of the investigation hotspots in the field of advanced manufacturing technology.
Therefore, it is important to investigate the numerical simulation theory and design the computer-aided engineer-ing software of silicone rubber vulcanizing process. On the basis, the properties of silicone rubber mould can be forecasted and the crosslinking structure can be controlled based on forward simulation method, or the reaction parameters can be optimized and the original polymeric material can be designed based on backward simulation method.
2. Dividing two-dimensional space For the area D with boundary G, as shown in Fig.https://www.51lunwen.org/liuxuelunwendx/ 1, it is divided in the manner of triangular element, the number of elements is expressed as E. Every element has its sequence number , ,…. The inner elements are numbered in advance, the outer elements with the third kind of thermal boundary condition are numbered sequentially, the outer elements with the fourth kind of thermal boundary condition are numbered finally. The number of nodes is expressed as n, every node also has its sequence number 1,2,…. Each element connects with its adjacent elements through its three nodes. For every element, its three nodes are numbered by i, j and m in the counterclockwise direction. For simplicity, only one side, which is numbered by jm, locates on the boundary in every outer element, and the node i is opposite to the boundary.
3. Calculating interpolating function An arbitrary element in area D is shown in Fig. 2.
Because the coordinate figures of the three nodes are known (ascertained by the above discretization of two-dimensional space), the lengths Si, Sj, Sm of the three sides jm, mi, ij and
the area D of the element can be calculated. In finite element simulation, the temperature T of an arbitrary point (x, y ) is dispersed to the three nodes. Namely, the temperature field of the element is expressed by the three nodal temperature.
References
[1] Pham DT, Gault RS. Int J Mach Tools Manuf 1998;38:1257.
[2] Yan X, Gu P. Int J Comput Aided Des 1996;28(4):307.
[3] Jia Y, Sun S, Zhao G. Spec Purpose Rubber Prod 2002;23(2):43.
[4] Jia Y, Xue S, Sun S. J本论文由英语论文网提供整理,提供论文代写,英语论文代写,代写论文,代写英语论文,代写留学生论文,代写英文论文,留学生论文代写相关核心关键词搜索。