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TECHNICAL PAPERS

Mixed-Mode Failure of Graphite/Epoxy Composites

[+] Author and Article Information
M. A. Seif, M. Shahjahan

Mechanical Engineering Department, Northern Illinois University, DeKalb, IL 60115

J. Eng. Mater. Technol 123(3), 371-376 (Mar 02, 2001) (6 pages) doi:10.1115/1.1375160 History: Received January 13, 2000; Revised March 02, 2001
Copyright © 2001 by ASME
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References

Waddoups,  M. E., Eisenmann,  J. R., and Kaminski,  B. E., 1971, “Macroscopic Fracture Mechanics of Advanced Composite Materials,” J. Compos. Mater., 5, pp. 446–454.
Poe,  C. C., 1983, “A Unifying Strain Criterion for Fracture Fibrous Composite Laminates,” Eng. Fract. Mech., 17, No. 2, pp. 153–171.
Anderson, T. L., 1991, Fracture Mechanics: Fundamentals and Application, CRC Press.
Daniel, I. M., 1993, “Composite Materials,” A. S. Kobayashi, ed., Handbook on Experimental Mechanics, Society for Experimental Mechanics, Bethel, CT.
Irwin, G. R., Kies, J. A., and Smith, H. L., 1958, “Fracture Strengths Relative to Onset and Arrest of Crack Propagation,” Proceedings of the American Society for Testing Materials, 58, pp. 640–657.
Wells,  A. A., 1963, “Application of Fracture Mechanics at and Beyond General Yielding,” Br. Weld. J., 10, pp. 563–570.
Dugdal,  D. S., 1960, “Yielding of Steel Sheets Containing Slits,” J. Mech. Phys. Solids, 8, pp. 100–108.
Whitney,  J. M., and Nuismer,  R. J., 1974, “Stress Fracture Criteria for Laminated Composites Containing Stress Concentration,” J. Compos. Mater., 8, pp. 253–264.
Tsai,  S. W., and Wu,  E. M., 1971, “A General Theory of Strength for Anisotropic Materials,” J. Compos. Mater., 5, pp. 58–80.
Petit,  P. H., and Waddoups,  M. E., 1969, “A Method of Predicting the Nonlinear Behavior of Laminate Composites,” J. Compos. Mater., 3, pp. 2–19.
Sandhu, R. S., 1974, “Ultimate Strength Analysis of Symmetric Laminates,” AFFDL-TR-73-137.
Wu, E. M., 1975, “Failure Criteria to Fracture Mode Analysis of Composite Laminates,” AGARD-CP-163.
Daniel, I. M., 1985, “Mixed-Mode Failure of Composites Laminated with Cracks,” Exp. Mech., Dec., pp. 413–420.
Harris, C. E., and Morris, D. H., 1985, “On the Use of Crack-Tip-Opening Displacement to Predict the Fracture Strength of Notched Graphite/Epoxy Laminates,” Exp. Mech., June pp. 193–199.
Feng,  H., Zhang,  J., and Rohde,  J., 1990, “Crack Surface Relative Displacement Analysis of Mixed-Mode Fracture Mechanics Problems,” Eng. Fract. Mech., 36, No. 6, pp. 971–978.
Post, D., Han, B., and Ifju, P., 1994, High Sensitivity Moire, Springer-Verlag.
Post, D., 1993, “Moire Interferometry,” A. S. Kobayashi, ed., Handbook on Experimental Mechanics, Society for Experimental Mechanics, Bethel, CT.

Figures

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The ratio between the critical stress intensity factors of Mode II and Mode I at different crack angles
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Critical stress intensity factor as a function of projected crack length in graphite/epoxy composites
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Normalized critical stress intensity factor for mode II versus crack inclination angle
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Normalized critical stress intensity factor for mode I versus crack inclination angle
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Effect of the crack angle on the applied stress and Crack Shearing Displacement
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Effect of the crack angle on the applied stress and Crack Opening Displacement
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Moiré fringe pattern corresponding to crack shearing displacement for crack at 60 degree with loading direction
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Moiré fringe pattern corresponding to crack opening displacement for crack at 60 degree with loading direction
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A front view of the orientation mechanism (view A-A in Fig. 1)
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Schematic drawing of the specimen showing the applied load, crack angle and parallel grating
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Moire interferometry setup

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