模具材料线胀系数对复合材料固化变形的影响研究

Research on the Influence of Thermal Expansion Coefficient of Mold Materials on the Forming of Thermally Cured Composites

为了研究模具材料线胀系数对复合材料固化变形的影响,面向复合材料零件热压罐固化成形工艺过程,针对复合材料成形模具材料与复合材料零件线胀系数不一致导致复合材料零件热固化变形的问题,研究了模具与复合材料零件相互作用关系,推导了模具对复合材料固化变形的理论模型,利用ABAQUS等仿真软件建立了模具温度场的数值模拟模型,并将模具热变形的模拟数据与复合材料零件变形的试验数据进行了对比分析。结果表明,不同材料模具型面各位置变形值与型面结构特征无关,与型面大小有关;模具材料与复合材料的线胀系数差异越大,复合材料零件变形量越大。

In order to study the effect of thermal expansion coefficient of mold materials on the curing deformation of composites,the hot pressing tank curing process of composite parts was focused.To address the problem of thermal curing deformation of composite parts caused by the inconsistency of thermal expansion coefficients between composite forming mold materials and composite parts,the interaction relationship between molds and composite parts was studied,and a theoretical model of mold on the curing deformation of composite parts was derived.A numerical simulation model of the mold temperature field was established using simulation software such as ABAQUS,and the simulation data of mold thermal deformation was compared and analyzed with the experimental data of composite part deformation.The results show that the deformation values at different positions of the mold surface of different materials are independent of the structural characteristics of the surface but are related to the size of the surface.The greater the difference in expansion coefficient between mold materials and composite materials,the greater the deformation of composite parts.