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本文应用两种方法表征拉挤工艺过程.其中第一种方法是用计算机模拟模具内放热固化和热传递的影响.应用等速升温的差示扫描量热仪(DSC)测定模拟固化反应所需的动力学参数.用不稳定状态热传导方程计算在拉挤型芯的温度分布.考虑到在固化期间会有放热产生,因此在这一方程中多加了一个附加项. 第二种方法是测量下述二种情况下的牵引力;一是在有工艺监控时;二是在测量复合材料与模具内壁之间界面剪切应力时.后者是通过牵引短距离浸渍的增强材料穿过加热的模具,同时获得监控牵引力.这就给出了材料在穿过模具的不同阶段内.剪切应力变化的特性曲线.
In this paper, two methods were used to characterize the pultrusion process.The first method was to simulate the influence of exothermic solidification and heat transfer in the mold by computer.Using constant-temperature differential scanning calorimetry (DSC) to simulate the solidification reaction The required kinetic parameters are calculated using the unsteady state heat transfer equation for the temperature distribution in the pultruded core and an additional term is added to this equation given that there will be an exotherm during solidification.The second method is The following two conditions were measured for traction: first, during process monitoring; second, when measuring interfacial shear stress between the composite and the inner wall of the mold, which was obtained by pulling a short distance impregnation of the reinforcing material through the heated Mold, while being monitored for traction, giving the characteristic curve of the shear stress change during the different phases of the material passing through the mold.