Finite Element Analysis Of Nano Particles Reinforced Elastomer Composite And The Study Of Constitutive Equation

Rubber elastomer constitutive theory is a very important research topic in rubber science. In the past century, many constitutive model was put forward. With the deepening of the carbon black reinforced rubber composite materials research, it has find some new phenomena of interaction between polymer chains and carbon black aggregates, such as percolation. Therefore, the exploration of new theory has very important significance. The main content of this research are as follows:(1) Based on the recent findings of polymer chain slipping on the surface of carbon black aggregates and debonding phenomenon between aggregrates, modification of macromolecular network constitutive model of carbon black filling rubber was studied to check modified constitutive model by experimental method, and the results show that the modified constitutive model has a better agreement with experimental data than the former model.(2) The influence of the composites of volume fraction, particle size, dispersion of carbon black particles on mechanical properties was analyzed. The results show that with the increase of carbon black particle volume fraction, modulus of rubber composites increased gradually. Within a certain range, the smaller the particle size, the better for the reinforcement. The order of influence degree of spherical particle, prism,20 polytope, cylindrical particle on the modulus of composite materials is:prism>cylindrical particle>20 polytope>spherical particle. The wider the dispersity, the higher the modulus of composites.(3) From the perspective of mesoscopic, the nanoscale carbon black particle size, dispersion and particle shape on orthogonal was studied by the finite element RVE, the result shows that the sequence of their influence on the strength of composite material is:particle volume fraction>particle shape >particle dispersion.(4) The influence of interface layer between carbon black particles and rubber matrix on mechanical behavior of composite material was studied. The equivalent modulus of the composites is influenced by the change of interfacial layer thickness. The smaller the thickness, the lower stiffness of the interface. The increase of interfacial phase modulus will lead to the rise of equivalent modulus of the composite materials. The order of magnitude of the stress of the three components of composite material is:internal stress of particles> interfacial layer stress>matrix stress.