Delamination Characteristics around Hole in Laminates with Softening Strip
Publication: Journal of Aerospace Engineering
Volume 6, Issue 2
Abstract
Graphite/epoxy laminates with and without a softening strip around a hole were investigated. The softening strip is a portion of the graphite critical ply, which is replaced by a glass/epoxy composite. Analysis was conducted with finite element methods: The in‐plane stress distribution was found using a planform two‐dimensional model and interlaminar stress distributions around a hole were obtained from a through‐thickness quasi‐three‐dimensional model. The variation of strain‐energy release rate for a delamination occurring at the critical interface was investigated. The finite element results indicate that the inplane and interlaminar stress distributions, as well as the strain‐energy release rates, are significantly reduced for laminates with a softening strip.
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References
1.
Armanios, E. A., Rehfield, L. W., Raju, I. S., and O'Brien, T. K. (1987). “Sublaminate analysis of interlaminar fracture in composites: Part II—Applications.” J. Composites Technol. and Res., 11(4), 147–153.
2.
Chan, W. S. (1989). “Delamination characteristics of laminates with a hole.” 4th Tech. Conf. on Composite Mat.
3.
Chan, W. S., and Ochoa, O. O. (1990). “Delamination characteristics of laminates under tension, bending, and torsion loads.” Comp. Mech., 6(5/6), 393–405.
4.
Chang, F. K., and Lessard, L. B. (1991). “Damage tolerance of laminated composites containing an open hole and subjected to compressive loadings: Part I—Analysis.” J. Composite Mat., 25(1), 2–43.
5.
Konish, H. J., and Whitney, J. M. (1975). “Approximate stresses in an orthotropic plate containing a circular hole.” J. Composite Mat., 9(Apr.), 157–166.
6.
Lekhnitskii, S. G. (1968). Anisotropic plates. Gordon and Breach, Science Publishers, Inc., New York, N.Y.
7.
Raju, I. S., and Crews, J. H. Jr. (1982). “Three‐dimensional analysis of [0/90]s and [90/0]s laminates with a central circular hole.” Composites Technol. Rev., 4(4), 116–124.
8.
Sun, C. T., and Luo, J. (1985). “Failure load for notched graphite/epoxy laminates with a softening strip.” Composites Sci. and Technol., 22, 121–133.
9.
Sun, C. T., and Voit, P. M. (1981). “Improvement of the first‐ply‐failure strength in laminates by using softening strips.” Composites Technol. Rev., 3(3), 109–113.
10.
Tang, S. (1977). “Interlaminar stresses around circular cutouts in composite plates under tension.” AIAA J., 15(11), 1631–1637.
11.
Zhang, K‐D, and Ueng, C. E. S. (1988). “A simplified approach for interlaminar stresses around a hole in [0/90]s laminates.” J. Composite Mat., 22(Feb.), 192–202.
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Copyright © 1993 American Society of Civil Engineers.
History
Received: Aug 19, 1991
Published online: Apr 1, 1993
Published in print: Apr 1993
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