LAUSR

In this paper, the compressive behavior of a carbon fiber composite pyramidal lattice cylinder has been predicted based on initial failure criteria and progressive damage. To this end, the 3D Hashin failure criteria have been employed with instantaneous and gradual unloading models using the user subroutine UMAT in ABAQUS/Standard. In the gradual unloading model, progressive damage has been controlled by exponential damage function. In addition, a new mold has been designed and manufactured for the experimental test of composite pyramidal lattice cylinders, which allows the use of the maximum essential strength of the fiber-reinforced composite. The predicted load-displacement curves using the finite element models are in good agreement with the experimental test results.