Conformal Processing Of Advanced Aircraft CFRP Flexible Parts Research On The Deformation Behavior Of Clamping

Carbon fiber reinforced polymer(CFRP)is widely used in high-end aerospace equipment.Especially in the main load-bearing member skins,wall panels,ribs and other flexible parts with thin-walled and weak rigid characteristics,the proportion is getting higher and higher.Since the flexible parts are easily deformed during the processing,the subsequent assembly links are affected.Therefore,this article combines engineering practice,starting from the clamping process of flexible parts,researches the deformation behavior of flexible parts,and proposes methods to restrain the clamping deformation of flexible parts,which provides a reference for guaranteeing the conformal processing of flexible parts.The research content and conclusions of this article are as follows:First,on the basis of clarifying that the distribution of the positioning parts has an important influence on the clamping deformation of the flexible parts,the "flexible parts-positioning parts"system under the two working conditions of trimming and window opening is simplified into a cantilever beam model and a simply supported beam model,respectively.The analysis is carried out and the distribution principle of"follow the shape-nearby" of the positioning parts is put forward.Then a finite element model of the CFRP flexible part was established,which can realize the deformation simulation analysis under different clamping conditions.Through the use of positioning and vacuum suction cup clamping simulation analysis,it can be known that the elastic deformation of the vacuum suction cup itself is easy to increase the clamping deformation,and the combination of the two should be used.Then,under the principle of"according to shape-nearest" distribution,positioning and vacuum suction cup combined clamping,the maximum displacement of the flexible part processing area is the goal,and the size of the flexible part and the relationship between balance,clamping and friction are constraints.The clamping time is analyzed based on the deformation under the free state,ideal tooling conditions and taking into account the deviation of the positioning geometrical quantity,combined with the "ISIGHT-ABAQUS" co-simulation method for optimization,and experimental verification,the results show that the deformation of the flexible part is reduced by 33.69%.