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Abstract

Interlaminar stresses play an important role for strength estimation of anisotropic laminates. In this paper the authors extend the results of anisotropic, generalized plane stress theory and assume certain power functions for the interlaminar stresses which must satisfy the equilibrium equation in the free edge area and the corresponding boundary conditions. The two parameters n and k are set equal to 4 and 0.5 respec tively. The calculated results are in good agreement with other analytical and numerical results. Using the formulas given here, the computing procedure will be greatly simplified and the effect of certain important parameters, such as the orientation angle, the ratio of thickness of different ply groups, and the stacking sequence, can be investigated systematically.

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References

Puppo, A.H. and Evensen, H.A. , "Interlaminar Shear in Laminated Composites Under Generalized Plane Stress," J. of Composite Materials, Vol. 4, pp. 204-220 (1970).

Pipes, B.R. and Pagano, N.J. , "Interlaminar Stresses in Composite Laminate Under Uniform Axial Extension," J. of Composite Materials, Vol. 4, pp. 538-548 (1970).

Tang, S. and Levy, A. , "A Boundary Layer Theory—Part II: Extension of Laminated Finite Strip," J. of Composite Materials, Vol. 9, pp. 42-52 (1975).

Spilker, R.L. and Chou, S.C. , "Edge Effects in Symmetric Composite Laminates: Importance of Satisfying the Traction-Free-Edge Condition," J. of Composite Materials, Vol. 14, pp. 2-20 (1980).

Wang, S.S. and Choi, I. , "Boundary-Layer Effects in Composite Laminates: Part 1-Free-Edge Stress Singularities, Part 2—Free—Edge Stress Solutions and Basic Characteristics ," J. of Applied Mechanics, Vol. 49, pp. 541-548, pp. 549-560 (September 1982).

Soni, S.R. and Pagano, N.J. , "Elastic Reponse of Composite Laminates," Mechanics of Composite Materials. Recent Advances, edited by Z. Hashin & C. T. Herakovich , Pergamon Press, pp. 227-242 (1982).

Pagano, N.J. and Pipes, R.B. , "Some Observations on the Interlaminar Strength of Composite Laminates," International J. of Mechanical Sciences, Vol. 15, pp. 679-688 (1973).

Tsai, S.W. and Hahn, H.T. , Introduction to Composite Materials, Technomic Publishing Co. (1980).

Whitcomb, J.D. and Rajo, I.S. , "Superposition Method for Analysis of Free-Edge Stresses," J. of Composite Materials, Vol. 17, pp. 492-507 (1983).

10.

Lucking, W.M. , Hoa, S.V. and Sankar, T.S. , "Effect of Geometry on Interlaminar Stresses of [0/90]s Composites Laminates with Circular Holes," J. of Composite Materials, Vol. 18, pp. 188-198 (1984).

11.

Hsu, P.W. and Herakovich, C.T. , "A Perturbation Solution for Interlaminar Stresses in Bidirectional Laminates," Composite Materials: Testing and Design ASTM STP 617, pp. 229-242 (1977).

12.

Whitney, J.M. , Daniel, I.M. and Pipes, R.B. , Experimental Mechanics of Fiber Reinforced Composite Materials, Society of Experimental Stress Analysis, published by Prentice-Hall ( 1982).

A Simplified Approach for Interlaminar Stresses in Orthotropic Laminated Strips

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