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针对VARTM工艺的特点,建立了充模过程树脂流动和预成型体变形行为数学模型。提出了基于混合网格方法的VARTM充模仿真算法,在该算法中,模具型腔几何模型进行二维或三维网格划分,在每个真空袋表面单元上增加一个一维附属单元,用于在仿真过程中实时地吸收或挤出因真空袋变形而产生的局部树脂体积变化,形成混合网格仿真模型;求解过程中,对树脂流动和预成型体变形分别进行求解后,基于上述混合网格模型进行两者耦合操作,实现了仿真精度和速度的统一。搭建了VARTM充模实验平台,进行了一维充模实验,通过仿真结果与实验测量结果对比,验证了本文算法的正确性。最后,通过三维仿真算例,验证了算法对三维复杂结构和顺序浇口策略仿真的可行性。
According to the characteristics of VARTM process, a mathematical model of resin flow and preform deformation behavior was established. In this algorithm, a two-dimensional or three-dimensional meshing of the mold cavity geometry model is proposed, and a one-dimensional ancillary unit is added to the surface unit of each vacuum bag for the purpose of In the process of simulation, the local volume change of the resin due to the deformation of the vacuum bag is absorbed or squeezed out in real time to form a hybrid mesh simulation model. After the solution of the resin flow and the deformation of the preform are solved respectively, Grid model for the coupling operation between the two, to achieve the unity of simulation accuracy and speed. A VARTM filling experiment platform was set up and a one-dimensional filling experiment was carried out. The simulation results and experimental measurement results were compared to verify the correctness of the proposed algorithm. Finally, through the three-dimensional simulation example, the feasibility of the algorithm for three-dimensional complex structure and sequential gate strategy simulation is verified.