Effect of Localized Bending at Through‐Flaws in Pressurized Composite Cylinders
Publication: Journal of Aerospace Engineering
Volume 6, Issue 4
Abstract
An analytical and experimental investigation was conducted to determine the effect of localized bending at through‐flaws in pressurized composite cylinders. A finite‐difference solution was formulated to determine the stress, strain, and displacement fields in the vicinity of a slit. Tests were conducted on 305‐mm‐diameter cylinders made from graphite/epoxy fabric in a configuration, with axial slits. Surface‐strain‐field measurements made in the vicinity of the slit showed a significant bending, which verified the finite‐difference solution. This significant bending near the slit tip results in a large magnification of the stresses there. An average stress criterion was employed to predict the failure response of these cylinders based on data obtained from coupon specimens. The finite‐difference solution provided correction factors to account for the localized bending. The prediction utilizing this methodology was excellent in all cases. A generalized methodology to assess damage tolerance of structural configurations with notches is proposed.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Anderson, R. B., and Sullivan, T. L. (1965). “Fracture mechanics of through‐cracked cylindrical pressure vessels.” NASA TN D‐3252, National Aeronautics and Space Administration (NASA), Washington, D.C.
2.
Brewer, J. C. (1982). “Tensile fracture of graphite/epoxy with angled slits.” TELAC Rep. 82‐16, Massachusetts Institute of Technology (MIT), Cambridge, Mass.
3.
Folias, E. S. (1965). “An axial crack in a pressurized cylindrical shell.” Int. J. of Fracture Mech., 1(2), 104–113.
4.
Folias, E. S. (1977). “Asymptotic approximations to crack problems in shells.” Mech. of Fracture; Vol. 3, Noordhoff International, Leiden, The Netherlands, 117–160.
5.
Graves, M. J., and Lagace, P. A. (1985). “Damage tolerance of composite cylinders.” Composite Struct., 4, 75–91.
6.
Peters, R. W., and Kuhn, P. (1957). “Bursting strength of unstiffened pressure cylinders with slits.” NACA TN 3993, NACA, Washington, D.C.
7.
Saeger, K. J., and Lagace, P. A. (1989). “Fracture of pressurized composite cylinders with a high strain‐to‐failure matrix system.” Composite materials: fatigue and fracture, Vol. 2, ASTM STP 1012, ASTM, Philadelphia, Pa., 326–337.
8.
Saeger, K. J. (1986). “Damage tolerance of composite cylinders with a high strain‐to‐failure matrix system.” TELAC Rep. 86‐11, Massachusetts Institute of Technology (MIT), Cambridge, Mass.
9.
Whitney, J. M., and Nuismer, R. J. (1974). “Stress fracture criteria for laminated composites containing stress concentrations.” J. Composite Mat., 8(July), 253–265.
Information & Authors
Information
Published In
Copyright
Copyright © 1993 American Society of Civil Engineers.
History
Received: Jan 10, 1991
Published online: Oct 1, 1993
Published in print: Oct 1993
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.