Three-Dimensional Numerical Simulation of Meso-Scale-Void Formation during the Mold-Filling Process of LCM
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Voids formed during liquid composite molding significantly degenerates mechanical performances of the final products, accurate prediction of the formation and size of void has significance for the parameter design of LCM. However, the 3D simulation method of void formation, in which the complex interconnecting of pores can be fully considered, has not been developed. In order to analyze the meso-scale-void formation process in full dimensionality, the mechanisms of dual-scale flow and void formation are analyzed firstly in this paper, then the mathematical models for the two-phase inter-tow and intra-tow flow are established based on the VOF theory. During numerical solving, the 3D geometry model is used and the momentum source of capillary force is updated in real-time to guarantee the simulation accuracy. The simulated formation process and size of meso-scale-void are compared with experimental results to verify the effectiveness and correctness of the developed method.
KeywordsLiquid composite moulding Mold-filling Void formation Numerical simulation
The presented work was supported by the National Natural Science Foundation of China (grant number 51605057, 51575139); the Fundamental and Frontier Research Project of Chongqing (grant number cstc2016jcyjA0456); the Fundamental Research Funds for the Central Universities (grant number 2018CDQYJX0013); the Postdoctoral Foundation Project of Chongqing (grant number Xm2016058).
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