Analysis Of Mechanical Properties Of Woven Composite Structure

The warp and weft yarns of the 3D angle-interlock woven composite material have a unique arrangement in the spatial direction.The warp and weft yarns are interwoven with each other while they are moving independently,which greatly enhances the thickness direction of the 3D angle-interlock woven composite material.The above mechanical properties have been widely used in the aerospace field where materials need to have excellent performance such as impact resistance,not easy to delamination,creep resistance and low coefficient of thermal expansion.However,composite materials are generally non-homogeneous materials and have anisotropic properties.Therefore,it is difficult to study their mesostructure and mechanical properties.The composite honeycomb sandwich structure has the characteristics of high specific strength and high specific rigidity,and has excellent heat insulation and wave transmission performance,which can effectively improve the flexural rigidity of the structure and enhance the ability of the structure to withstand bending moments.Therefore,it has been widely used in aerospace,military ships,automobiles and other fields.The article adopts a combination of finite element method and multi-scale method to analyze the microstructure of the 3D angle-interlock woven composite material,and reasonably assumes the cross-sectional shape and spatial orientation of the yarn inside the composite material.It also fully considers the problem that the crosssectional deformation of the yarn in the composite material is different from that of the internal yarn due to the different forces.Using the weaving software Tex Gen,a 3D angle-interlock woven composite material meso-level finite element cell model was established,and then imported into the finite element analysis software ABAQUS for subsequent calculations.By modifying its INP file,the material properties of the model were assigned,The definition of boundary conditions and the application of calculated load,and further analysis of the Young's modulus,shear modulus,and Poisson's ratio of the 3D angle-interlock woven composite under different warp yarns passing through the weft layer and fiber volume fraction At the same time,the macroscopic equivalent thin plate of composite material was established,and its vibration mode was studied.The carbon fiber honeycomb sandwich structure was prepared by using fiber plain cloth,aluminum honeycomb core,epoxy resin and curing agent.Using specially customized fixtures and indenters,the mechanical properties of the composite aluminum honeycomb sandwich structure were tested and studied,and the composite material The factors affecting the mechanical properties of the aluminum honeycomb sandwich structure are analyzed.The article mainly studies the mechanical properties and vibration modes of the 3D angleinterlock woven composites and the mechanical properties of the composite aluminum honeycomb sandwich structure.On the basis of the existing microstructure of the composite material,considering the spatial orientation and cross-sectional shape of the yarn inside the composite material,a finite element unit cell model for calculation and analysis was established.Through calculation and analysis of the model,the realization of Prediction of the overall mechanical properties of composite materials.The influence of the number of layers of warp through weft and the volume fraction of fiber on the mechanical properties of 3D angleinterlock woven composites is discussed,and the stress and strain field distribution cloud diagrams of the composite material model under traditional tensile and shear loads are obtained,and then determined The maximum and minimum stress areas of the matrix and the yarn.Through the previous research,a series of material parameters of composite materials are obtained.Using the finite element method,the composite material is equivalent to a uniform thin plate structure,and combined with the obtained mechanical parameters of the composite material,the first four-order vibration modes and inherent parameters of the equivalent thin plate of the three-dimensional angle interlocking woven composite material are analyzed.As for the research on the mechanical properties of the composite aluminum honeycomb sandwich structure,the article uses the vacuum-assisted resin transfer molding method to prepare carbon fiber laminates and glass fiber laminates.The curing agent is blended with epoxy resin as an adhesive to bond the carbon fiber The panel and the aluminum honeycomb are glued together to form a composite aluminum honeycomb sandwich structure.Through experimental methods,the effects of load application rate and aluminum honeycomb side length on the mechanical properties of composite aluminum honeycomb sandwich structure are mainly studied.