Simulation and Research of Numerical Pipeline Constitutive Model Based on MATLAB

Abstract

After modern greenhouses adopt water and fertilizer integrated intelligent irrigation technology, it not only saves water and fertilizer but also greatly reduces the intensity of human labor. This paper mainly simulates and verifies the basic performance of the main pipes and branch pipes that supply water and fertilizer in the water and fertilizer integrated machine, which is convenient for matching more suitable main pipes and branch pipes in material selection and establishes the main pipe for fertilization and branch pipes based on Johnson-Cook under large deformation conditions. The numerical calculation model of the constitutive equation is used to numerically simulate and analyze the mechanical response of the pipeline during uniaxial tension through the finite element analysis method. Combined with the stress-strain experimental data in the tensile process, the least square method is used to identify and fit the parameters of the Johnson-Cook constitutive equation, and the numerical model is coupled to perform finite element analysis to realize the strain of the main pipe and branch pipe during the tensile process. Numerical simulation of softening, diameter reduction, orientation hardening and other phenomena. The results show that the simulation results are in good agreement with the experimental results, and the research method is of reference for the establishment of nonlinear, large-deformation main pipe, and branch pipe behavior numerical models.