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Abstract

A failure analysis is performed to study the effect of adhesive interleaves on the development of damage modes such as transverse cracking or delamination in fiber reinforced composite laminates. The quadratic tensor polynomial failure criterion used in the analysis is divided appropriately into two components corresponding to intra-ply fail ure or matrix transverse cracking and interlaminar delamination respectively. The beneficial role of adhesive interleaves, placed in-between the anisotropic plies of a com posite laminate, in preventing delamination, is exemplified for the case of the straight-edge tensile coupon of angle-ply stacking sequence. It is shown that the component of the fail ure condition responsible for delamination is drastically reduced by the presence of adhe sive interleaves while the overall strength of the laminate depends on the stacking se quence. In addition, it is pointed out that residual curing stresses are of paramount importance in failure analyses and their omission often leads to erroneous results.

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References

Puppo, A.H. and H.A. Evensen. 1970. "Interlaminar Shear in Laminate Composites under Generalized Plane Stress," J. Comp. Mat. , 4.204.

Pipes, R.B. and N.J. Pagano. 1970. "Interlaminar Stresses in Composite Laminates under Uniform Axial Extension," J. Comp. Mat. , 4:538-548.

1989. "Interlaminar Response of Composite Materials ," Composite Material Series, Vol. 5, N. J. Pagano, ed. (Series ed. R. B. Pipes), Amsterdam: Elsevier.

Sun, C.T. and S.G. Zhou. 1988. "Failure of Quasi-Isotropic Composite Laminates with Free Edges,"J. Reinf. Plastics Comp. ,7:515-557.

Sun, C.T. and G.D. Chu. 1991. "Reducing Free Edge Effect on Laminate Strength by Edge Modification," J. Comp. Mat. , 25:142-161.

Chan, W.S. , C. Rogers and S. Aker. 1986. "Improvement of Edge Delamination Strength of Composite Laminates Using Adhesive Layers" in Composite Materials: Testing and Design, 7th Conference, ASTM STP 893, J. M. Whitney, ed., Philadelphia: American Society for Testing and Materials , pp. 266-285.

Soni, S.R. and R.Y. Kim. 1987. "Analysis of Suppression of Free-Edge Delamination by Introducing Adhesive Layer," ICCM-VI , F. L. Matthews, N. C. R. Buskell, J. M. Hodgkinson and J. Morton, eds., London , England: CML Publ., pp. 5.219-5.230.

Roupakias, G.S. , T.P. Philippidis and S.A. Paipetis. "Enhancing Strength in Laminated Composites by Adhesive Interleaves," presented at the Ist National Congress on Computational Mechanics, Athens, Greece, September, 1992.

Herakovich, C.T. 1988. "On the Relationship between Engineering Properties and Delamination of Composite Materials," J. Comp. Mat. , 15:336-348.

10.

Wang, A.S.D. and F.W. Crossman. 1977. "Some New Results on Edge Effect in Symmetric Composite Laminates," J. Comp. Mat. , 11:92-106.

11.

Kim, R.Y. 1989. "Experimental Observations of Free-Edge Delamination ," in International Response of Composite Materials, Vol. 5, N. J. Pagano, ed., Composite Materials Series, Series ed. R. B. Pipes , Amsterdam: Elsevier , pp. 111-160.

12.

Theocaris, P.S. and T.P. Philippidis. 1991. "On the Validity of the Tensor Polynomial Failure Theory with Stress Interaction Terms Omitted ," Comp. Sci. Tech, 40(2):181-191.

13.

Theocaris, P.S. and T.P. Philippidis. 1991. "Failure Criteria for Composite Materials Based on Tensor Polynomial Theory: A Critical Assessment ," in Advanced Composites in Emerging Technologies , S. A. Paipetis and T. P. Philippidis , eds. , Patras, Greece: AMATEC Publ. Co. pp. 89-99.

14.

Theocaris, P.S. 1992. "Weighing Failure Tensor Polynomial Criteria for Composites," Int. J. Damage Mech. , 1(1):4-46.

15.

Theocaris, P.S. and T.P. Philippidis. 1987. "The Paraboloidal Failure Surface of Initially Anisotropic Elastic Solids," J. Reinf. Plastics Comp. , 6:378-395.

16.

Narayanaswami, R. and H.M. Adelman. 1977. "Evaluation of the Tensor Polynomial and Hoffman Strength Theones for Composite Materials ," J. Comp. Mat. , 11:366-377.

17.

Tsai, S.W. and H.T. Hahn. 1980. Introduction to Composite Matertals . Lancaster, PA: Technomic Publishing Co., Inc.

18.

Zienkiewicz, O.C. 1977. The Finite Element Method . McGraw-Hill.

Delamination Prevention in Composites by Interleaving Techniques

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