Interlaminar Stresses in CFRP Composites with a Hole

Abstract

Based on theories of composite sheets, the generated stresses in a stratified composite loaded in monotonic tensile are composed of the σ_x, σ_y and τ_xy components, which are situated in the plane of the sheet. In fact in the interface of different layers, the σ_z normal stress and τ_xz and τ_yz shear stresses, normal to the plane are also generated, which are amplified in the vicinity of the holes. The generation of the interlaminar stresses is due to the difference in the poisson ratio between two neighbour layers. These interlaminar stresses lead to delamination and the failure of the composite. The evaluation of the value and the situation of these stresses would be useful to prevent the failure of the stratified composite by delamination. For this purpose a model composed of three dimensional 20- nodes quadric brick element was developed. The stratified composite with a hole in its center was loaded under monotonic tensile. The computation of stresses was carried out using Ansys software. The result was that interlaminar stresses were obtained for six different lay up sequences of the T300/934 CFRP composites. These results will be the base for the evaluation of delamination of the corresponding composite.

Citation

Khoshravan, M.R. and Jami, A.R. (2006), "Interlaminar Stresses in CFRP Composites with a Hole", Research Journal of Textile and Apparel, Vol. 10 No. 3, pp. 28-36. https://doi.org/10.1108/RJTA-10-03-2006-B004