Study On Mechanical Properties And Damage Behavior Of Triaxial Woven Fabrics Reinforced Rubber Composites

The fabric-reinforced flexible composite is composed of fabric and flexible matrix,which satisfies the material's requirements for light texture,high strength,high toughness and flexibility.It is widely used in military industry,construction and security protection.Fabrics played a crucial role in the mechanical properties of fabric-reinforced flexible composite.Therefore,the development of new textile structures has become the main goal of researchers and engineers.Triaxial woven fabric(TWF)is made of three sets of yarns interwoven with each other at a certain angle(usually at 60 °)in plane,which has quasi-isotropic mechanical properties,good structural stability,high tear strength and anti-bursting.The structural characteristics of triaxial woven fabric makes it have significant advantages in applications that require high isotropy of flexible composites,such as rubber diaphragms.In this paper,the mechanical properties of triaxial woven fabric reinforced rubber composite are studied by experimental methods and finite element analysis methods,and compared with the mechanical properties of plain weave fabric reinforced rubber composite material.It established the basis for the application of triaxial woven fabric to the reinforcement of flexible composite.The specific research content of this article is summarized as follows:(1)Preparation of triaxial woven fabric reinforced rubber composite material.Triaxial woven fabric reinforced rubber composite are prepared from 186.67 tex nylon 66 industrial filament triaxial woven fabric and nitrile rubber compound.According to the cross-sectional shape and geometric path of the nylon 66 filament in triaxial woven fabric,it is established that the finite element model of triaxial woven fabric reinforced rubber composite.(2)The tensile properties of triaxial woven fabric reinforced rubber composites.The tensile properties of triaxial woven fabric reinforced rubber composites.They are studied that the tensile properties of specimens under off-axis loading,which deviates from the reference 0 °,15 °,30 °,45 °,60 °,75 ° and 90 ° in the counterclockwise direction based on a group of yarns in TWF reinforced rubber composites.It is also analyzed that the influence of the shape of the specimen(rectangular and dumbbell-shaped)on the tensile properties of TWF-reinforced rubber composite.The research results show that,under the uniaxial tensile load,the damage of triaxial woven fabric reinforced rubber composites expand along the yarn direction e,and its failure mechanism is tensile-shear mixed failure.Compared with the rectangular specimens,the dumbbell-shaped specimens have higher tensile breaking strength and the damage location is far from the fixture.Compared with plain weave fabric-reinforced rubber composites,triaxial woven fabric reinforced rubber composites exhibit excellent isotropic properties in tensile properties and are suitable for applications that require higher isotropy.(2)Tear performance of triaxial woven fabric reinforced rubber composites.It is studied that the tearing performance of triaxial woven fabric and its reinforced rubber composites,including two cases where the pre-incision is along the yarn direction and the pre-incision is along any two groups of yarn angle bisectors.It is analyzed that the variation law of the tearing load and the tearing damage characteristics of the specimens.The research shows that the tearing process of triaxial woven fabric and its reinforced rubber composites can be divided into three stages: the initial stage,the pre-notch opening stage and rip expansion stage,which are respectively related to low modulus area,high modulus area and shock area.When the precut is parallel to the yarn,triaxial woven fabric and its reinforced rubber composite have a higher tear load and tear initiation position.(3)Bursting performance of triaxial woven fabric reinforced rubber composites.The paper studies the shape of the impactor,the contact position of the impactor and yarns on the bursting performance of triaxial woven fabric reinforced rubber composites.The research shows that the blunt impactor produces a larger bursting load and slope of the load-displacement curve,and less initial damage displacement.The rubber matrix effectively improves the bursting load of triaxial woven fabric and reduces the damage area of the specimens.The initial damage displacement of triaxial woven fabric and its reinforced composite is basically the same.Under the action of three impactor,the contact displacement between the impactor and yarns of triaxial woven fabric reinforced composite has basically no effect on the load displacement curve and damage morphology.Compared with plain weave fabrics,triaxial woven fabric have higher load-displacement curve slope and failure load,and lower initial damage displacement,showing better structural stability.Due to the consolidation effect of the rubber matrix on the yarn in triaxial woven fabric,the bursting load-displacement curve and damage characteristics of triaxial woven fabric-reinforced rubber composite and plain weave-reinforced rubber composite are basically the same.They are obtained by the finite element simulation method that the stress distribution,burst load-displacement curve,burst failure process,burst failure morphology,etc.of the three impactors.(5)The finite element simulation results of triaxial woven fabric reinforced rubber composites during off-axis stretching have high consistency with experiments results,which verify the correctness of the off-axis tensile finite element model and parameter settings.