An Anisotropic Hyper-elastic Constitutive Model Considering Shear-tension Coupling And Forming Simulation Of 2-Dimensional Woven Fabrics

Owing to its high strength,low density,strong design and many other advantages,2-dimensional woven composite materials have become the daring of the times.Compared with the high cost and low efficiency of the traditional trial and error method,the use of numerical simulation method can not only reduce the cost of 2-dimensional woven fabrics research but also improve the efficiency,but currently the tensile-shear coupling characteristic of the 2-dimensional woven composites is often used to be selectively ignored in the simulation to simplify the numerical model.Therefore,in order to better characterize the mechanical properties of2-dimensional woven fabrics,this paper systematically studied the shear-tension coupling property by combining experimental investigation,theoretical analysis and numerical simulation.In this paper,uniaxial tensile test and with/without pre-tension picture frame test of T700-12 K carbon fiber plain woven fabrics were carried out to analyze the the mechanical properties of 2-dimensional plain weave fabrics.Experimental results show that the mechanical behaviors of2-dimensional plain woven fabrics are high non-linear,and with the increase of pre-tension,the shearing force Increases.Then,based on the continuum mechanics theory,the shear-tension coupling mechanical property was introduced into the anisotropic hyper-elastic constitutive model of 2-dimensional woven fabrics,and an anisotropic hyper-elastic constitutive model considering the shear-tension coupling was developed,and the model parameters were determined according to the correspondingmechanics experiments.The developed constitutive model was successfully embedded in ABAQUS_Standard module with the user material subroutine interface UANISOHYPER_INV.The validity and higher accuracy were verified by comparing the experimental values with the simulation values ??of picture frame tests under different pre-tension conditions,and the simulation results of the coupled/uncoupled models.The successful development of the tensile-shear coupling constitutive model provides a theoretical model for the subsequent 2-dimensional woven fabric forming simulation and process parameter optimization.Finally,the hemispherical stamping experiment of 2-dimensional plain woven fabric was carried out by using the hemisphere stamping die designed by ourselves,and its results were compared with the corresponding simulation results,the reliability of the constitutive model was further verified,and we found:(1)In actual production process,the appropriate blank holder force is conducive to slow the occurrence of wrinkling;(2)The desired shape can be obtained by changing the yarn orientation of 2-dimensional woven fabrics,meanwhile,this way can help to eliminate some of the molding defects,such as uneven deformation.