Effective Stiffness Concept in Bending Modeling of Laminates with Damage in Surface 90-Layers

Composites Part A: Applied Science and Manufacturing 2016
Andrejs Pupurs, Janis Varna, M Loukil, H Ben Kahla, D Mattsson

Simple approach based on Classical Laminate Theory (CLT) and effective stiffness of damaged layer is suggested for bending stiffness determination of laminate with intralaminar cracks in surface 90-layers and delaminations initiated from intralaminar cracks. The effective stiffness of a layer with damage is back-calculated comparing the in-plane stiffness of a symmetric reference cross-ply laminate with and without damage. The in-plane stiffness of the damaged reference cross-ply laminate was calculated in two ways: (1) using FEM model of representative volume element (RVE) and (2) using the analytical GLOB-LOC model. The obtained effective stiffness of a layer at varying crack density and delamination length was used to calculate the A, B and D matrices in the unsymmetrically damaged laminate. The applicability of the effective stiffness in CLT to solve bending problems was validated analyzing bending of the damaged laminate in 4-point bending test which was also simulated with 3-D FEM.

Atslēgas vārdi
B. Transverse crackingб C. Analytical modelingб C. Finite element analysis (FEA)
DOI
10.1016/j.compositesa.2015.11.012
Hipersaite
https://www.sciencedirect.com/science/article/pii/S1359835X15004108?via%3Dihub

Pupurs, A., Varna, J., Loukil, M., Ben Kahla, H., Mattsson, D. Effective Stiffness Concept in Bending Modeling of Laminates with Damage in Surface 90-Layers. Composites Part A: Applied Science and Manufacturing, 2016, Vol.82, 244.-252.lpp. ISSN 1359-835X. Pieejams: doi:10.1016/j.compositesa.2015.11.012

Publikācijas valoda
English (en)