3D f iber waviness model and prediction of compressive strength of stitched laminates

A 3D fiber waviness model was presented. Based on the finite element method and periodic boundaryconditions , a method to analyze the compressive st rength of stitched laminates was established , which adopted abridging model and maximum st ress criteria to predict the development of damage and obtain the compressivest rength. The predicted result s are in good agreement with the test data. The effects of stitching parameters on thecompressive st rength of stitched laminates are discussed in detail. The results indicate that when stitching along thefiber on the surface of laminates , smaller stitch space and step and larger stitch radius result in higher compressivest rength. However , when stitching perpendicular to the fiber on the surface , smaller stitch space and radius andlarger stitch step result in higher compressive st rength.