浸渍过程中树脂流体在纤维集合体内的流动行为

建立了浸渍过程中树脂基体在纤维集合体内流动的统计力学模型。将树脂流体的流动过程视为纤维/树脂系统降低能量达到平衡的过程,从微观角度研究树脂流体在纤维集合体内的流动行为。在建模中,不仅考虑了代表系统内能的Hamilton函数和界面张力及驱动流体的压力对系统所作的功,还考虑了流动过程中纤维集合体对流体的摩擦阻力所作的功,完整地反映了在流体的流动过程中系统能量的变化。模拟了水在聚酯纤维非织造织物内及不饱和聚酯树脂在玻纤机织布内的平面径向流动,并设计了相应的实验,以检验模型对不同流动性能流体和不同结构纤维集合体的适应情况。实验与模拟结果良好的一致性表明,所建立的模拟能正确地反映流体在纤维集合体内的流动特征。

FLOW PERFORMANCE OF RESIN FLUID INSIDE FIBROUS ASSEMBLIES

A statistical model is developed to study the flowing performance of resin fluid inside fibrous assemblies during the impregnation process. The probability of a fluid move is the function of the variation of a fiber/resin system's energy before and after moving. The energy of the fiber/resin system includes its internal energy, which is the Hamiltonian, and the work done by the interfacial tension between the fiber and resin, by the pressure driving the resin, and by the friction loss when the resin flows through fibrous assemblies, which is expressed in thermodynamic terms as pressure. Simulation is performed to study the performances of a selected fluid flows through fibrous assemblies, i.e. water through nonwoven PET fiber mats and unsaturated polyester resin through glass woven fabrics. To verify the model, a set of experiments illustrates the water through the fiber mats with different fiber volume fractions and the resin through the woven fabric with different influxes. Simulation results are in good agreement with experiments, indicating good prospect of the model used in this area.