| The fiber-reinforced structure and the tough polymer matrix form a flexible composite material,where the reinforced structure determines the load-bearing capacity of the flexible composite material and ensures the dimensional stability of the fabric,providing the strength and rigidity of the material,and plays a major role.It is particularly important to study the mechanical properties of reinforced structures,damage and failure behaviors,large deformations of materials,and prediction of nonlinear elastic behavior of materials.Therefore,the ultra-high molecular weight polyethylene filament fabric is often used as a reinforcing structure in flexible composite materials,and its tearing performance is the focus of this paper.In this paper,for two different specifications of ultra-high molecular weight polyethylene filament fabrics,the experimental research and finite element simulation analysis of the weft single-seam tear performance are carried out.In the first step,the yarn in the fabric is subjected to a tensile test to obtain the relevant mechanical properties of the yarn;then the fabric is subjected to a weft single-stitch tear test to obtain the tearing result.The second step is based on the mechanical properties of the yarns in the fabric,and the two fabrics are modeled and finite element simulated tear calculation and analysis respectively.The third step is to output the results through the computer to obtain the final tearing shape and tearing load-displacement curve of the UHMWPE filament fabric by the weft single-seam method,and compare these simulation results with the results of the quasi-static tearing experiment.Make a comparison,reveal the accuracy and validity of the model and the finite element calculation results,explore and analyze the relevant factors that affect fabric tearing and the tearing mechanism.The results of the quasi-static experiment show that the tear failure of the UHMWPE filament fabric under the weft single-stitch method is caused by shearing.The size of the tearing stress triangle and the size of the fabric tearing strength are positively correlated.During the cracking process,the size of the stress triangle will not change significantly,but it will move forward continuously.The yarns of the untensioned system are broken one by one,forming a fracture surface resembling a knife cut,which is shown as shaking up and down on a platform on the tearing load-displacement curve.The finite element calculation results show that the quadratic curve(RHO=0.5)is used to establish the yarn model,the friction coefficient of the warp and weft yarns is set to 0.001,the mesh division selects 2 elements and 4 nodes(2E4N),the Poisson's ratio is set to 0.100,and the stress is three.The axis degree is set to 0.333,and the obtained finite element simulation tearing result fits the quasi-static tearing experimental result best under the condition of saving computer computing resources.The main factors affecting the tearing strength of the fabric are the breaking strength of the warp yarn,the radius of the warp and weft yarn,the warp and weft density of the fabric.In order to design an ultra-high molecular weight polyethylene filament fabric with high tearing strength in actual production and life,the breaking strength and warp density of the warp yarn in the fabric can be increased,and the number of warp and weft yarns and the weft density can be appropriately reduced.Or increase the volume of warp and weft yarns.The quasi-static experimental test results and the energy output results of the finite element calculation are verified to illustrate the accuracy and effectiveness of the finite element simulation calculation.Therefore,you can refer to the simulation design in this article and apply it to other more complex fabric numerical simulation calculations. |
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