基于三维细观随机模型的碳纳米颗粒/聚合物力电响应模拟OA北大核心CSTPCD

A method combining finite element analysis and resistance calculation of equivalent micro-circuit networks is proposed to simulate the coupling electromechanical behavior of carbon nanoparticles filled polymer.Firstly,according to the improved nearest distance algorithm,a representative volume element model of carbon nanoparticles filled polymer is established by the secondary development of ABAQUS.The changes of junction width between two nearby aggregates under different loading conditions are obtained by the finite element analysis.Then,the composite is simplified as a 3D micro-circuit network comprised of vast random resistors,and the equivalent resistance is calculated by the transfer-matrix method and the tunneling resistance formula.Finally,the resistance of composite is related to the global stress by the junction width of adjacent aggregates,and the resistance-stress curve is obtained.To verify the approach,a composite of CB3100 filled silicone rubber is simulated under different axial compressive stresses,and the results are compared with the experimental and numerical data in reference.The results show that this method can not only effectively simulate the electromechanical behavior of carbon nanoparticles filled polymers,but also reveal the strain sensing mechanism in the meso-scale.