Analysis Using FEM Of Multi-Scale Connection Of Polymeric Systems Under Their Condensed States

One of the most important areas in modern polymer research is to understand and quantitatively predict the structures and properties in the final materials and processing applications starting from the condensed state equilibrium and non-equilibrium physical and phase structures. This is even more complicated by the complex temperature, pressure and flow conditions with restricted geometry and time dependence. This important, however challenging area has become one of the focuses and competitions internationally due to its importance in science as well as in application. This research that include polymer science, condensed matter physics, materials science, and computational mathematics, opened a new horizon in the multi-disciplinary science front. The theory, calculation, modeling have already achieved certain mutuality within the micro, meso, and macro scales in polymer science and materials. The challenge in the immediate future is to achieve a seamless connection between the length scales and a realistic comparison and validation through experiments and processing.For the sake of the large parallel computation of the mechanical property of polymeric material under its melting or condensed state, firstly, we tested the abilities of〞KOKLE PC-Cluster008-01a〞parallel computer which is co-developed by Experimental and Computational Mechanics Research Institute of Xinjiang University and KOKLE High-Tech Development Corporation. The result of the test showed that its performances meeted our expected needs. It offered a scientific theory to the parallel computation of the present FEM program based on the solid mechanics.Secondly, a fluid FEM program was made using FORTRAN77 language, by means of FEM, in order to analyze the mechanical property of polymer under its melting state. The program can calculate 2D steady flow of any geometric boundaries. The theoretical base of the fluid FEM program is the discreteness of Navier-Stokes equation. The iso-parametric element with four nodes and the iso-parametric element with eight nodes are used in the FEM program. The program can simulate some laminar flow, and the result of the simulation accorded well with the reality. But as far as the turbulent flow and the laminar flow of high Reynolds number,the program are not completed yet ,and it needs some adjustment and improvement.