Accurate matrix-dominated constitutive properties can be a key to accurate failure models for polymer-matrix composites. This work shows the effect of nonlinear interlaminar shear stress-strain relations on delamination failure predictions for thick IM7/8552 carbon/epoxy tape laminates with wavy plies. Nonlinear finite element model (FEM) predictions and subsequent test correlations are presented. The interlaminar shear stress-strain relations are generated using short-beam shear tests and a digital image correlation full-field strain measurement technique. Test data for the wavy-ply coupons show that nonlinear shear stress-strain response is required for accurate failure prediction.
Dobyns, A., Rousseau, C.Q. and Minguet, P. ( 2000). Helicopter Applications and Design, Delaware Composites Design Encyclopedia, 5: 223-242.
2.
Makeev, A., Ignatius, C., He, Y. and Shonkwiler, B. ( 2009). A Test Method for Assessment of Shear Properties for Thick Composites, Journal of Composite Materials (accepted for publication) .
3.
Murri, G. ( 1999). Influence of Ply Waviness on Fatigue Life of Tapered Composite Flexbeam Laminates, In: ASTM Symposium on Composite Structures: Theory and Practice, Seattle, WA.
4.
American Society for Testing and Materials (2006). Standard Test Method for Tensile Properties of Polymer Matrix Composite Materials, ASTM Standard D 3039/D 3039M, ASTM International.
5.
American Society for Testing and Materials (2001). Standard Test Method for In-plane Shear Response of Polymer Matrix Composite Materials by Tensile Test of a ±45° Laminate, ASTM Standard D 3518/D 3518M , ASTM International.
6.
Camanho, P.P. and Lambert, M. (2006). A Design Methodology for Mechanically Fastened Joints in Laminated Composite Materials , Composites Science and Technology, 66(15): 3004-3020.
7.
American Society for Testing and Materials (2005). Standard Test Method for Shear Properties of Composite Materials by the V-Notched Beam Method, ASTM Standard D 5379/D 5379M, ASTM International.
8.
American Society for Testing and Materials ( 2006). Standard Test Method for Short-beam Strength of Polymer Matrix Composite Materials and their Laminates, ASTM Standard D 2344/D 2344M, ASTM International.
9.
Peng, C., Sutton, M.A., Shreier, H.W. and McNeill, S.R. ( 2002). Full-field Speckle Pattern Image Correlation with B-Spline Deformation Function, Proceedings of the Society for Experimental Mechanics, 49: 344-352.
10.
Lekhnitskii, S.G. (1981). Theory of Elasticity of an Anisotropic Body, Mir Publishers, Moscow.
11.
ABAQUS V6.8 User Subroutines Reference Manual, Section 1.1.
