Results are presented for the fracture strengths of several Gr/Fp (AS/3501-5) laminates containing countersunk holes and normal and slant cracks. Countersinks are treated as effective uniform holes and slant cracks as effective normal cracks. It is shown that the average stress criterion leads to acceptable strength predictions for all cases considered.
Get full access to this article
View all access options for this article.
References
1.
J.M. Whitney and R.J. Nuismer, "Stress I racturc Criteria for Laminated Composites Containing Stress Concentrations," J. Compossite Materials, Vol. 8, (1974), p. 253.
2.
R.J. Nuismer and J.M. Whitney, "Uniaxial I ailure of Composite Laminates Containing Stress Concentrations," ASTM-STP 593, American Society for Testing and Materials, 1975, p. 117.
3.
D.H. Morris and H.T. Hahn, "Mixed-Mode I racture of Graphite/Epoxy Composites Fracture Strength," J. Composite Materials, Vol. 11 (1977), p. 124.
4.
J.M. Whitney and R.Y. Kim, "Effect of Stacking Sequence on the Notched Strength of Laminated Composites ," presented at the ASTM 4th National Conference on Composite Materials: Testing and Design, Valley Forge, PA, May 3-4, 1976.
5.
J.B. Whiteside, I.M. Daniel, and R.E. Rowlands, "The Behavior of Advanced Filamentary Composite Plates with Cutouts," AFFDL-TR-73-48, Air Force Flight Dynamics Laboratory, June, 1973.
6.
G.C. Grimes, P.H. Francis, G.E. Commerford, and G.K. Wolfe, "An Experimental Investigation of the Stress Level at which Significant Damage Occurs in Graphite Fiber Plastic Composites," AFML-TR-72-40, Air Force Materials Laboratory, 1972.
7.
G.E. Brown, "Progressive Failure of Advanced Composite Laminates Using the Finite Element Method," M. S. Thesis, University of Utah, March , 1976.
8.
R.J. Nuismer and G.E. Brown, "Progressive Failure of Notched Composite Laminates Using Finite Elements," in Advances in Engineering Science, NASA CP-2001, Vol. 1 ( 1976), p. 183.
9.
S.W. Tsai and H.T. Hahn, "Failure Analysis of Composite Materials," in Inelastic Behavior of Composite Materials, AMD Vol. 13, American Society of Mechanical Engineers, 1975, p. 73.
10.
M.E. Waddoups , J.R. Eisenmann, and B.E. Kaminski, "Macroscopic Fracture Mechanics of Advanced Composite Materials," J. Composite Materials , Vol. 5 (1971), p. 446.
11.
R.E. Peterson , Stress Concentration Factors, John Wiley and Sons, New York, 1974 .
12.
J.M. Whitney , "The Effect of Stress Concentrations on the Fracture Behavior of Fiber Reinforced Composite Materials," Proceedings 12th Annual Meeting Society of Engineering Science , The University of Texas at Austin , 1975, p. 17 3.
13.
R.M. Verette and J.D. Labor, Structural Criteria for Advanced Composites, Northrop Corporation, Aircraft Division, Air Force Contract No. F33615-74-C-5182, Final Report, Vol. 1, January 1977.
