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TECHNICAL PAPERS

Low Cycle Fatigue of Unidirectional Laminates: Stress Ratio Effects

[+] Author and Article Information
V. M. Harik

U.S. Army Research Laboratory, AMSRL-WM-MB, Aberdeen Proving Ground, MD 21005ARL Group, Center for Composite Materials, University of Delaware, Newark, DE 19716

J. R. Klinger

U.S. Army Research Laboratory, AMSRL-WM-MB, Aberdeen Proving Ground, MD 21005National Nonwovens Inc., P.O. Box 150, East Hanover, MA 01027

T. A. Bogetti

U.S. Army Research Laboratory, AMSRL-WM-MB, Aberdeen Proving Ground, MD 21005ARL Group, Center for Composite Materials, University of Delaware, Newark, DE 19716

J. Eng. Mater. Technol 122(4), 415-419 (Apr 12, 2000) (5 pages) doi:10.1115/1.1289024 History: Received December 22, 1999; Revised April 12, 2000
Copyright © 2000 by ASME
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References

Talreja, R., 1987, Fatigue of Composite Materials, Technomic, Lancaster, PA.
Reifsnider, K. L., ed., 1991, Fatigue of Composite Materials, Comp. Mat. Series, Vol. 4, Elsevier, London.
Harik, V. M., Fink, B. K., Bogetti, T. A., Klinger, J. R., and Gillespie, J. W., Jr., 2000, Low Cycle Fatigue of Composite Structures in Army Applications: A Review of Literature and Recommendations for Research, ARL-TR-2242 on ARL LCF Program, U.S. Army Research Laboratory, Aberdeen, MD.
Rie, K.-T., and Portella, P. D., eds., 1998, Low Cycle Fatigue and Elasto-Plastic Behavior of Materials, Elsevier, Oxford.
Picasso, B., and Priolo, P., 1988, “Damage assessment and life prediction for graphite-PEEK quasi-isotropic composites,” PVP-Vol. 146, pp. 183–188, Pressure Vessels and Piping Division of ASME, American Society of Mechanical Engineers, New York.
Simonds, R. A., and Stinchcomb, W. W., 1989, “Response of notched AS4/PEEK laminates to tension/compression loading,” Advance in Thermoplastic Matrix Composite Materials, ASTM STP 1044, G. M. Newaz, ed., pp. 133–145, American Society for Testing and Materials, Philadelphia.
Case., S. W., and Reifsnider, K. L., 1998, MRLifell™: “A Strength and Life Prediction Code for Laminated Composite Materials,” Virginia Polytechnic Institute and State University, Blacksburg.
Uleck, K. R., Harris, J. S., and Vizzini, A. J., 1998, “Effect of temperature on the fatigue life of a quasi-isotropic graphite/epoxy laminate,” Proc. 13th Tech. Conf. ASC, Baltimore, September 21–24.
Chaphalkar, P., 1998, “Performance evaluation and modeling of twill woven laminates,” Ph.D. thesis, North Carolina A&T State University.
Harik, V. M., Klinger, J. R., Fink, B. K., Bogetti, T. A., Paesano, A., and Gillespie, J. W., Jr., 1999, “Low Cycle Fatigue of Unidirectional Glass/Epoxy Composite,” Durability and Damage Tolerance of Composite Materials and Structures, MD-Vol. 86/AMD-Vol. 232, Pelegri, A. A., et al., ed., pp. 79–86, American Society of Mechanical Engineers, New York, NY.
Mandell,  J. F., Huang,  D. D., and McGarry,  F. J., 1981, “Tensile fatigue performance of glass fiber dominated composites,” Comp. Tech. Rev., 3, No. 3, pp. 96–102.
Gamstedt,  E. K., and Talreja,  R., 1999, “Fatigue damage mechanisms in unidirectional carbon-fibre-reinforced plastics,” J. Mater. Sci., 34, No. 11, pp. 2535–2546.
Owen, M. J., 1974, “Fatigue damage in glass-fiber-reinforced plastics,” in Composite Materials 5. Fracture and Fatigue, Boutman, L. J., ed., Chapter 7, Academic Press, New York.
Lorenzo, L., and Hahn, H. T., 1986, “Fatigue failure mechanisms in unidirectional composites,” Composite Materials: Fatigue and Fracture, ASTM STP 907, Hahn H. T., ed., Philadelphia, pp. 210–232.
Subramanian,  S., Reifsnider,  K. L., and Stinchcomb,  W. W., 1995, “A cumulative damage model to predict the fatigue life of composite laminates including the effect of a fibre-matrix interphase,” Int. J. Fatigue, 17, No. 5, pp. 343–351.

Figures

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Typical failures of unidirectional specimens that show significant “brooming” under quasi-static and LCF tensile loading
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Fatigue life diagram for unidirectional PMCs under axial loading (after Talreja, 1987)
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Evolution of LCF damage (i.e., matrix cracks and micro-voids, voids and “wing-shaped” cracks at broken fibers before fiber bridging and interfacial debonding of fibers) under tensile fatigue loading
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LCF life data for a unidirectional glass/epoxy composite. The stress ratio, R, is 0.1. LCF loading is normalized by the ultimate load.
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LCF life data for a unidirectional glass/epoxy composite. The stress ratio, R, is 0.25. LCF loading is normalized by the ultimate load.
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Comparison of LCF data for the stress ratio R=0.25, and the theoretical linear S-N curve, which is defined by Eq. (1)

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