Research On The Deformation Behavior Analysis Of Rubber Matrix Composites Structure

Rubber matrix composite is a kind of very important composites after resin,metal and ceramic matrix composites.Due to its hyperelasticproperties and large deformation characteristics,it has great potential in the fields of aerospace,light-structure construction,oil transportation pipe and soon.It is of great theoretical significance and engineering application value to study the the constitutive model of rubber matrix composite.In this paper,we focuses on studying the constitutive models of rubber materials and cord / rubber composites,and analysis of the deformation behavior of the bump structure of a helicopter aero-engine.The main research contents and conclusions are as follows:(1)Based on the continuum mechanics,Rivlin's series function is used to analyze the constitutive model of rubber material.Constitutive models of rubber materials are mainly three forms: Neo-Hookean model,Mooney-Rivlin model and Yeoh model.Form the relationship between the strain energy function and the invariant,the stress-strain relation of the constitutive model of rubber material was obtained through theoretical derivation.According to the uniaxial tensile test data of rubber materials,the material parameters of the three kinds of hyperelastic constitutive models are fitted respectively.The experimental data are compared with the three model function curves.Through the uniaxial tensile simulation analysis of rubber materials,Further verify the accuracy of the Mooney-Rivlin model in the small to medium strain range.(2)A constitutive model of cord / rubber composites was established based on the theory of unidirectional fiber-reinforced continuum mechanics.Based on the theory of continuum mechanics,an anisotropic hyperelastic constitutive model withfiber-matrix shearinteraction was established based on the strain energy density function of the material.The stress-strain relation of the cord / rubber material under uniaxial tension was was obtained through theoretical derivation,and the method of determining the material parameters was given.The material parameters of the constitutive equation were obtained by MATLAB program fitting the test data of the cord/rubber material of different uniaxial tensile.Using the UANISOHYPER_INV interface provided by ABAQUS for secondary development of the constitutive model,a cord / rubber composite constitutive program was established.The uniaxial tensile simulation results were compared with the experimental data to verify the established cord / rubber constitutive model reliability.Through the cylinder model,the characteristics of the reinforcement model are introduced,and the analysis error of the two constitutive models is compared through the simulation analysis.(3)The deformation characteristics and influencing factors of the bump of particle separator are analyzed and studied.Based on the constitutive model of cords / rubber composites,the finite element model of the bump is established by ABAQUS.The cord / rubber composites constitutive program is called to analyze the influence of different layers,different cord angles and different cord spacing on the maximum deformation height of bump.(4)According to the requirement of deformation curve of bump,the specific structure of bump was designed.The influence of cord angle and cord spacing on deformation curve of bump was analyzed by finite element simulation.