Research on creep modeling and simulation of cotton fiber assembly based on the three-dimensional discrete element

Abstract

In order to analyze the mesoscopic contact characteristics of cotton fiber creep, this paper uses the meso-particle discrete element method to establish a cotton fiber assembly creep microscopic model based on the existing cotton fiber creep experiment. The microscopic parameters of the Particle Flow Code contact constitutive model are calibrated according to the macroscopic mechanical indexes of cotton fiber creep obtained from experiments, and the creep strain of the cotton fiber in the instantaneous creep stage under different compressive stresses and the contact force between particles are analyzed. According to the time–temperature equivalence principle, the calculation efficiency of the viscoelastic discrete element model is optimized, which improves the time scale of the simulation test. The results show that the numerical simulation results accord with the variation characteristics of the experimental creep variables, which verifies the feasibility of the method in this paper. The research results can provide a certain reference for the deeper study of cotton fiber creep characteristics and its mechanism.