树脂比热容对复合材料固化过程数值模拟的影响

在对热固性树脂基复合材料固化过程进行数值模拟时,通常取固化后树脂的比热容作为整个固化过程中树脂的比热容,这将会为结果带来较大的误差.但是由于固化放热的影响,树脂固化过程的比热容测试难以进行.本工作对此进行了研究,提出了一种假设:即以凝胶点为分界点,凝胶点前随着固化度的增大,比热容由未固化树脂的比热线性减小到凝胶点时与固化完全后的树脂相同;凝胶点后采用固化完全树脂的比热.模拟的结果与实测值具有良好的一致性.

The Effect of Specific Heat of Thermal Resin on the Simulation of Composite Curing Process

When simulating the curing process of composites, the specific heat of cured resin was often used as that of the resin during the whole process. This could cause great error in the simulation result. As the heat release of curing reaction, the specific heat of resin during curing was difficult to be measured. A hypothesis was presented that the specific heat of resin changed greatly at the gel point. Before that point the specific heat of uncured resin was linearly lessening to the value of cured resin, while after gel point the specific heat of cured resin was used. The simulation result was in good agreement with the experiment data.