ANALYSIS BASED ON THE INDIVIDUAL LAMINA FRACTURES OF BOX SECTION CFRP BEAMS WITH DIFFERENT SHEAR SPAN LENGTHS

Abstract

 This paper presents a study on the failure load and deformation of CFRP box beams based on the fracture of individual laminas. Three different shear spans of cross ply (CP) laminate structures are tested and analyzed. Nonlinear constitutive law is obtained by considering the fracture of individual lamina, and the law is implemented into a fiber model to obtain the failure load of the beams under different shear spans. The fiber model is also used to obtain the flexural deformation of the beams, while Timoshenko beam is referred to obtain the shear deformation. Analysis shows a fair agreement on load-displacement relations and failure patterns, although a slight difference is observed under short shear spans.