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TECHNICAL PAPERS

Experimental Determination of KI for Short Internal Cracks

[+] Author and Article Information
K. Bearden

Department of Engineering Mechanics, U.S. Air Force Academy USADA, CO 80840

J. W. Dally, R. J. Sanford

Department of Mechanical Engineering, University of Maryland, College Park, MD 20742

J. Appl. Mech 68(6), 937-943 (Jan 18, 2001) (7 pages) doi:10.1115/1.1381004 History: Received July 26, 2000; Revised January 18, 2001
Copyright © 2001 by ASME
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References

Irwin, G. R., 1958, discussion of paper by Wells and Post, Proc. SESA, Vol. XVI, pp. 93–96.
Wells, A., and Post, D., 1958, “The Dynamic Stress Distribution Surrounding a Running Crack—A Photoelastic Analysis,” Proc. SESA, Vol. XVI, pp. 69–93.
Schroedl, M. A., and Smith, C. W., 1973, “Local Stresses Near Deep Surface Flaws Under Cylindrical Bending Fields,” Progress in Flow Growth and Fracture Toughness Testing, ASTM STP 536, ASTM, Philadelphia, PA, pp. 45–63.
Bradley,  W. B., and Kobayashi,  A. S., 1970, “An Investigation of Propagating Cracks by Dynamic Photoelasticity,” Exp. Mech., 10, No. 3, pp. 106–113.
Chisholm,  D. B., and Jones,  D. L., 1977, “An Analytical and Experimental Stress Analysis of a Practical Mode II Fracture Test Specimen,” Exp. Mech., 17, No. 1, pp. 7–13.
Smith,  D. G., and Smith,  C. W., 1972, “Photoelastic Determination of Mixed Mode Stress Intensity Factors,” Eng. Fract. Mech., 4, No. 2, pp. 357–366.
Gdoutus,  E. E., and Theocaris,  P. G., 1978, “A Photoelastic Determination of Mixed Mode Stress Intensity Factors,” Exp. Mech., 18, No. 3, pp. 87–97.
Etheridge,  J. M., and Dally,  J. W., 1978, “A Three Parameter Method for Determining Stress Intensity Factors From Isochromatic Fringe Loops,” J. Strain Anal., 13, No. 2, pp. 91–94.
Sanford,  R. J., and Dally,  J. W., 1979, “A General Method for Determining Mixed Mode Stress Intensity Factors From Isochromatic Fringe Patterns,” Eng. Fract. Mech., 11, pp. 621–633.
Berger,  J. R., and Dally,  J. W., 1988, “An Overdeterministic Approach for Measuring K1 Using Strain Gages,” Exp. Mech., 28, No. 2, pp. 142–145.
Barker,  D. B., Sanford,  R. J., and Chona,  R., 1985, “Determining K and Related Stress Field Parameters From Displacement Fields,” Exp. Mech., 25, No. 12, pp. 399–407.
Kalthoff, J. F., 1987, “Shadow Method of Caustics,” in Handbook on Experimental Mechanics, A. S. Kobayashi, ed., Prentice-Hall, Englewood Cliffs, NJ, pp. 430–500.
Rosakis,  A. J., and Ravi-Chandar,  K., 1986, “On the Crack-Tip Stress State: An Experimental Evaluation of Three-Dimensional Effects,” Int. J. Solids Struct., 22, No. 2, pp. 121–134.
Sanford, R. J., and Drude, B. T., 1993, Proc. 1993 Conf. on Exp. Mechanics, SEM Bethel, CT.
Isida,  M., 1966, “Stress Intensity Factors for the Tension of an Eccentrically Cracked Strip,” ASME J. Appl. Mech., 33, pp. 674–675.
Sanford,  R. J., 1979, “A Critical Re-examination of the Westergaard Method for Solving Opening-Mode Crack Problems,” Mech. Res. Commun., 6, No. 5, pp. 289–294.
Sanford,  R. J., 1989, “Determining Fracture Parameters With Full-Field Optical Methods,” Exp. Mech., 29, No. 3, pp. 241–247.
Chona, R., Irwin, G. R., and Sanford, R. J., 1983, “Influence of Specimen Size and Shape on the Singularity Dominated Zone,” Fracture Mechanics: Fourteenth Symposium —Volume: I Theory and Analysis, ASTM STP 791, J. C. Lewis and G. Sines, eds., ASTM, Philadelphia, PA, pp. 13–23.

Figures

Grahic Jump Location
Illustration of the near, intermediate, and far-field regions near the single-ended crack tip
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Light and dark field isochromatic fringe patterns yield a set of data points for numerical analysis
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Coordinate system for the internal crack
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Geometry of the tension panels with symmetric and eccentric cracks
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Comparison of the original isochromatic fringe pattern with a computer regenerated fringe pattern for a central crack
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Comparison of the original isochromatic fringe pattern with a computer regenerated fringe pattern for an eccentric crack

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