The Influence of Stacking Sequence on Laminate Strength
Based upon considerations relating to the nature of the interlaminar stresses in composite laminates, an approach is presented to predict the detailed stacking sequence of specific layer orientations which leads to optimum protection against delamination under uniaxial static and fatigue loadings. In particular, it is argued that the interlaminar normal stress as well as the interlaminar shear stress, is instrumental in precipitating delamination and subsequent strength degradation. Correlation with existing experimental evidence of the stacking sequence phenomenon is presented.
KeywordsComposite Laminate Fatigue Loading Free Body Diagram Boundary Layer Region Lamination Theory
Unable to display preview. Download preview PDF.
- 1.R. L. Foye and D. J. Baker, “Design of Orthotropic Laminates”, presented at the 11th Annual AIAA Structures, Structural Dynamics, and Materials Conference, Denver, Colorado, April 1970.Google Scholar
- 2.B. E. Kaminski, “On the Determination of the Failure Surface for an Orthotropic Quasi-Homogeneous Material”, Master’s Thesis, Georgia Institute of Technology, June 1969.Google Scholar
- 3.R. G. Spain, “Graphite Fiber Reinforced Composites”, AFML-TR-66–384, Air Force Materials Laboratory, Wright-Patterson AFB, Ohio (1967).Google Scholar
- 4.J. C. Halpin and E. M. Wu, to be published (1971).Google Scholar
- 6.Y. Staysky, “Bending and Stretching of Laminated Aeolotropic Plates”, Proc. Am. Soc. Civil Engrs.; J. Engr. Mech. Div., Vol. 87 (1961), p. 31.Google Scholar
- 7.R. Byron Pipes and N. J. Pagano, “Interlaminar Stresses in Composite Laminates Under Uniform Axial Extension”, J. Composite Materials, Vol. 4 (1970), p. 538.Google Scholar
- 9.E. P. Chen and G. C. Sih, “Interfacial Delamination of a Layered Composite Under Anti-Plane Strain”, J. Composite Materials, Vol. 5 (1971), p. 51.Google Scholar
- 10.G. C. Sih, P. D. Hilton, and R. P. Wei, “Exploratory Development of Fracture Mechanics of Composite Systems”, AFML-TR-70–112, Air Force Materials Laboratory, Wright-Patterson AFB, Ohio (1970).Google Scholar