Simulation Study Of Curing Deformation For Thermosetting Resin Matrix Composite Components

Resin matrix composites are widely used in the field of aeronautics and astronautics because of their high specific strength,specific modulus and strong designability.The amount of advanced resin matrix composites has become an important symbol to measure the advancement of aircraft.As the main method of resin matrix composite molding,the curing process largely determines the quality and performance of composite components.In the curing process of resin matrix composites,due to environmental factors,the material 's thermal expansion and cold shrinkage,the resin curing shrinkage and component 's interaction with mold,complex temperature field and uneven curing degree field of composites can be formed,which lead to residual stress in component.Due to the effect of residual stress,curing deformation occurs in the component after demoulding,which seriously affects the quality and geometric accuracy of components.Therefore,there is significance to study the curing deformation of composites to improve product quality and reduce production cost.In this paper,a physical model of resin matrix composites was established on the basis of the curing method by hot bonder.According to curing kinetics,heat transfer and mechanics of composite materials,a mathematical model was established to calculate the field variables during the curing process of composites.The temperature field and curing degree field of the laminates were calculated,and the heat transfer and curing kinetics models were verified by comparing with the experimental results in the references.The effects of different thermal boundary conditions on the curing process of laminates with different thicknesses were calculated.When the adiabatic boundary condition is applied to the upper surface of the laminate,the peak temperature and the temperature gradient are the highest.The higher thickness of laminate is,the higher peak temperature is,and the higher temperature gradient is.The results provide a basis for the selection of appropriate boundary conditions for studying the curing deformation of composites.The curing deformation of C-shaped component is calculated in the case of whether or not considering the interaction of molds and components.The results show that calculation results are close to the experimental value when considering the interaction of molds and components.The effects of curing process and composites' performance parameter on curing deformation of C-shaped structure are also calculated.The calculation results show that the resin curing shrinkage rate and the fiber volume fraction of the composites had a greater influence on the components' curing deformation,the higher curing shrinkage rate of the resin,the greater the deformation;The higher composites' fiber volume fraction,the component curing deformation of component is smaller.With the increase of curing temperature and the increase of heating and cooling rate,the curing deformation of components increased slightly,but the overall effect was not significant.According to the curing deformation parameters of C-shaped components,a compensation optimization method for the mold surface was proposed,and it was found by numerical calculation that the compensation method could significantly reduce the curing deformation of components...