注射成型的计算机数值模拟中参数S的探讨

在注射成型的数值模拟中，流导S是一个在压力场和温度场求解过程中耦合压力方程和能量方程的关键参数，基于材料非弹性、非牛顿、非等温的流动充填机理及边界条件，建立了温度、剪切速率、粘度、流导S的数学模型，并采用了外推法和非流温度法计算流导，研究结果表明：流导S与压力的相关性决定了压力代数方程的线性性；S是模腔半厚度h的增函数；非流温度法减少了外推法过度外推引起的误差。

The Discussion of Parameters S in the Computer Numerical Simulation of Injection Molding

In the numerical simulation of injection molding,fluidity S is a key parameter to couple with perssure equation and energy equation in the solution of pressure and temperature fields.Basing on the filling principle of non-elastic,non-Newtonian and non-isothermal fluid as well as boundary condition,the mathematical model of temperature,shear rate,viscosity,fluidity S was built.The fluidity S was calculated by the extrapolation and No-flow temperature method.It is proved that the relativity between fluidity S and pressure determines the linearity of the algebraic equation of pressure. S is the increasing function of half thickneww h of the cavity.No-flow temperature reduces the errors arising from excessive extrapolation.