Research On Multi-Scale Design And Manufacturing Integration Technology Of Composite Members Based On NURBS

Advanced composite materials are widely used in the aerospace industry as well as in civil applications such as aircraft and automobiles because of their high strength ratio and light weight.However,the complex manufacturing process of composite materials and high-cost manufacturing have affected the development and application of domestic composite materials.Foreign technology has developed for a long time,and its research on the path planning of automatic placement equipment far exceeds domestic.Due to the foreign technology blockade,most of the advanced composite materials are still laid in labor.Composite design/manufacturing integration technology is critical to composite manufacturing.It can greatly promote the development of automatic placement of composite materials.A multi-scale design/manufacturing framework for composite materials using a topdown(top-down)multi-scale design concept is proposed in this paper.Starting from the design of composite materials,a delineation scheme from a preliminary model based on macroscopic to a detailed model based on mesoscopic and microscopic model is established.From the multi-scale perspective,a framework for manufacturability analysis of composite design models is proposed.A design and analysis scheme based on NURBS(non-uniform rational B-spline)was established.The design model and manufacturability analysis are built in a unified mathematical expression to achieve the purpose of design and manufacturing integration.Modeling composites from a multi-scale perspective.The macroscopic geometric model of composite materials is established by using NUBRS to interpolate the type points.The material partition and the microscopic expression of the fiber direction were established based on the Voronoi diagram.The MetaMesh partition design concept for composite component features was proposed.Establish a composite material construction feature partition boundary generation algorithm and link the macro model with the mesoscopic model to improve the derivation ability of the design model.A composite laminate model based on NUBRS was established and a microscopic model of the composite was established.A prepreg tape placement analysis for the composite design model was established.Partition processing based on NURBS design model and introduction of grounding line solving problem based on Bezier surface.The deformation mechanism of unidirectional fiber placement was analyzed from a microscopic point of view.The differential geometry is used to analyze the conditions of pleural stretch on the free-form surface of the unidirectional fiber slab and use this condition as a criterion for the manufacturability analysis of the design model.The position of possible defects in the design model is proposed as the evaluation of the layout of the design model and the simulation verification is carried out by using MATLAB.An integrated analysis system for composite design and manufacturing was developed.The MATLAB-based composite material design and manufacturing system was developed and the integration of preliminary model,detailed model,design model and manufacturability analysis was realized.Taking the wing skin member as an example,the correctness of the integrated analysis of the design and manufacture of the composite material was verified.