Finite element method-based yarn material parameter identification method

The invention discloses a finite element method-based yarn material parameter identification method, which comprises the following steps: I, establishing a yarn constitutive model; II, selecting a set of initial values according to prior information; III, establishing a finite element model, and performing uniaxial tensile simulation by adopting the periodic boundary condition; IV, under the same experiment condition, conducting an tensile experiment on a set of fabric samples with the same specifications to obtain a uniaxial tensile experiment curve; V, taking the residual sum of squares of a uniaxial tensile simulation curve worked out according to the finite element model and the uniaxial tensile experiment curve obtained in the step IV as an objective function; VI, performing optimization on the objective function in the step V by utilizing an Levenberg-Marquardt algorithm. The tensile deformation behavior of yarns can be correctly reflected by the phenomenological yarn constitutive relation proposed by the invention; according to the parameter identification method disclosed by the invention, reliable yarn section modulus can be obtained only by the simple uniaxial tensile experiment.