NONLINEAR LARGE DEFORMATION BENDING PROPERTIES OF THE TRACHEA1)

This paper studies the tension and bending properties of the artificial trachea and the biologic trachea. According to the tensile test, a nonlinear constitutive model is established with a power function and based on a linear constitutive model of the artificial trachea obtained by fitting test data, with the maximum fitting error of 18.8%. According to the nonlinear bending theory, the large deformation bending deformation equation for the trachea is established, and the analytical solution is obtained. The maximum error between the theoretical bending load and the experimental result is 8.7%. Based on the explicit finite element method, a finite element simulation method is proposed for the bending deformation of the trachea. The error for the bending angle of the dog trachea between the finite element analysis result and the experimental result is 3%.