Stress-strain state analysis of the lugs made from an anisotropic composite material reinforced by short fibers

The stress-strain state of the lugs made from PEEK 90HMF20 composite material reinforced by short fibers was analyzed. The problem of modeling the anisotropy of the mechanical characteristics of parts taking into account the direction of reinforcing fibers was discussed. Two sizes of lugs were considered. In Moldex 3D system the molding of the plate and determination of the orientation of the fibers was calculated. In the module Digimat MAP a model for transferring information about the orientation of the fibers when cutting the lugs from the plate is constructed. The received orientation tensor is used to construct a multi-level material model in the Digimat system. Calculation of the stress-strain state of the lugs was performed in the ANSYS Workbench. For each lug size, the displacement module fields and equivalent stresses were determined, and hole ovalization was also evaluated. The dependencies of the ovalization of the lug hole on the force of its extension for each size of the lugs were constructed. The stiffness of the lugs, cut along and across the direction of molding of the plate, was compared.