Distortion Analysis And Optimization Of Design Process For Large Integral Laminated Structures

Fiber woven composite material is a new type of high temperature structural composites and functional materials,which is not only has excellent biocompatibility,good mechanical properties,high strength,high stiffness,excellent erosion resistance and high temperature retention characteristics,but also has the impact damage resistance performance,delamination resistance and high strength in vertical direction of structure,good quality,insensitive to cracking and damage spread slowly,so it is widely used in the field of aerospace.In view of the distortion of laminated heterogeneous parts usually occur in the manufacturing process,using the finite element simulation technology,exploring the internal cause of heterogeneous laminated through the deformation of the structure and process so as to realize effective control of heterogeneous laminated material deformation,engineering technology to enhance the level of large heterogeneous laminated composite direction.Based on the analysis of the microstructure characteristics of the fiber-woven composites,the microstructure of the fiber-reinforced resin matrix composites was studied from the new perspective of material research.On the scale of the carbon fiber size,the properties and behavior of the fiber braided materials are predicted and designed by the respective properties,geometrical states and Orientation conditions of fiber-braided structure and resin matrix,established the modeling idea of "material model" with the premise of "digitalization,numericalization,virtualization,visualization" and "virtual material".With the help of the three-dimensional commercial modeling software CATIA,we have established the geometric model of an aircraft skin CKFR-PMCs woven laminated structure.In the finite element analysis stage,first,large-scale hetero-laminated parts do mold flow analysis to study the deformation conditions of the parts during the injection process,and then designed a kind of virtual material and virtual process will make the injection in the injection process will not produce warping deformation,compared the physical quantities with time variation in the two injection procedure.The flow analysis truly displayed the flow of the plastic melt(rheid)in the mold cavity during the injection process and accurately predicted the temperature,pressure etc.of the parts at various stages with the time evolution in the“ injection-compression keep-cooling ” technological process.And then the state of the injection process numerical,Transfer the digitized state to the finite element analysis software ABAQUS for process analysis.Reproduced the surface temperature and stress change in the whole injection molding process to study the influence of the process parameters on the deformation of the parts and to achieve the aim of technical optimization.The distribution of the stress field,strain field and displacement field of the heterogeneous laminated composite material under the temperature load is obtained.Has realized the data exchange and state inheritance between different finite element analysis software,Established the “ Injection compression molding simulation platform”,On this simulation platform,we can complete the“mold preheating-injection molding-compression molding-cooling solidification ”,which can be used as a guide for the forming process design and deflection prediction of large scale and trans-scale heterogeneous composite materials.