Study On The Elastic Modulus Of 2.5-dimension Fabric

2.5D woven composite material has good integrity and can be mechanized.It has good anti-layer shear properties,excellent out-of-plane mechanical properties,and strong impact resistance.It is obtained in aviation,aerospace,shipping,sports and medical treatment.Wide attention and application.As a reinforcement of 2.5-dimensional braided composite material,2.5-dimensional fabric is its skeleton structure,which largely determines its mechanical properties.In this paper,the mesostructure of 2.5-dimensional fabric is analyzed and studied.The tensile modulus and shear modulus are deduced through theory.The relationship between the yarn geometric parameters and modulus is studied.The cell and macro structure were theoretically derived and numerically analyzed.First,according to the weaving method and cross-sectional shape characteristics of 2.5-dimensional fabric,the warp and weft yarns are straight,the warp yarn is sinusoidal,and the fiber bundle cross-sectional shape is the geometric model of the lenticular lens,and the unit cell model of the fabric is determined.According to the selected lenticular unit cell model,the principle of energy is used to analyze the force of the yarn in the fabric,and the tensile modulus in the warp direction,the tensile modulus in the weft direction,and the shear of the unit cell are derived respectively Cut modulus.Then,the finite element analysis software is used to analyze the model,and the simulation results and theoretical analysis results are verified.First,the fabric unit cell model was established using Tex Gen software,and then the model was imported into ABAQUS finite element analysis software to obtain the simulation results of the model,and the simulation results were analyzed and compared with the theoretical model.The theoretical model and the simulation model are consistent better.Finally,the relationship between the yarn parameters and the orientation angle in the unit cell is studied,the influence of the number of yarn layers on the tensile elastic modulus of the 2.5-dimensional fabric is analyzed,and the The relationship between the tensile modulus and warp,weft,and warp yarns,respectively,and draw relevant conclusions.