Simple and Fast Method to Calculate Shape Factors of Stiffened Panels Repaired with Composites
Publication: Journal of Aerospace Engineering
Volume 32, Issue 3
Abstract
In this paper, a new, simple, and robust method is presented to calculate the shape factor and stress intensity factor (SIF) of cracked stiffened panels in a mode-I condition repaired with a single-side composite patch. For this purpose, huge finite element (FE) analyses are carried out to achieve a simple equation using normalized parameters and a fitting technique for a vast range of repaired stiffened panels. The parametric study was performed using five effective parameters, including crack length, stiffeners and panel moment of inertia, material, and thickness of the composite patch. Using the proposed formulation in this paper, performing the complex and time-consuming FE analyses to calculate the stress intensity factors for such repaired complex components is not necessary. The obtained results are verified using several FE models. The maximum differences between the predicted shape factors using the proposed equation with those obtained from FE analyses are indicated to be approximately 7%, which is acceptable for engineering purposes.
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References
Bachir Bouiadjra, B., M. Belhouari, and B. Serier. 2002. “Computation of the stress intensity factors for repaired cracks with bonded composite patch in mode I and mixed mode.” Compos. Struct. 56 (4): 401–406. https://doi.org/10.1016/S0263-8223(02)00023-5.
Baker, A. A., and R. Jones. 1988. Vol. 92 of Bonded repair of aircraft structures, 214. Dordrecht, Netherlands: Martinus Nijhoff Publishers.
Chu, H. P., J. A. Hauser, and J. P. Sikora. 1982. “Fatigue crack growth in stiffened panels under pressure loading.” In ASTM STP 761: Design of fatigue and fracture resistant structures, 345–372. West Conshohocken, PA: ASTM.
Di Pisa, C., and M. H. Aliabadi. 2015. “Boundary element analysis of stiffened panels with repair patches.” Eng. Anal. Boundary Elem. 56 (Jul): 162–175. https://doi.org/10.1016/j.enganabound.2015.01.019.
Hosseini-Toudeshky, H., M. A. Ghaffari, and B. Mohammadi. 2012. “Finite element fatigue propagation of induced cracks by stiffeners in repaired panels with composite patches.” Compos. Struct. 94 (5): 1771–1780. https://doi.org/10.1016/j.compstruct.2012.01.002.
Hosseini-Toudeshky, H., M. A. Ghaffari, and B. Mohammadi. 2013. “Mixed-mode crack propagation of stiffened curved panels repaired by composite patch under combined tension and shear cyclic loading.” Aerosp. Sci. Technol. 28 (1): 344–363. https://doi.org/10.1016/j.ast.2012.12.001.
Hosseini-Toudeshky, H., and B. Mohammadi. 2007. “A simple method to calculate the crack growth life of adhesively repaired aluminum panels.” Compos. Struct. 79 (2): 234–241. https://doi.org/10.1016/j.compstruct.2006.01.005.
Hosseini-Toudeshky, H., B. Mohammadi, and H. R. Daghyani. 2006. “Mixed-mode fracture analysis of aluminium repaired panels using composite patches.” Compos. Sci. Technol. 66 (2): 188–198. https://doi.org/10.1016/j.compscitech.2005.04.028.
Hosseini-Toudeshky, H., M. Saber, and B. Mohammadi. 2009. “Finite element crack propagation of adhesively bonded repaired panels in general mixed-mode conditions.” Finite Elem. Anal. Des. 45 (2): 94–103. https://doi.org/10.1016/j.finel.2008.07.010.
Hosseini-Toudeshky, H., G. Sadeghi, and H. R. Daghyani. 2005. “Experimental fatigue crack growth and crack-front shape analysis of asymmetric repaired aluminium panels with glass/epoxy composite patches.” Compos. Struct. 71 (3–4): 401–406. https://doi.org/10.1016/j.compstruct.2005.09.032.
Jones, R., and R. J. Callinan. 1979. “Finite element analysis of patched cracks.” J. Struct. Mech 7 (2): 107–130. https://doi.org/10.1080/03601217908905315.
Lu, J., Y. Hu, and D. Ju. 1991. “An assessing method of fatigue life on central-through cracked plate with adhesive bounded reinforcement.” Fatigue Fract Risk ASME 215: 135–140.
Mitchell, R. A., R. M. Woolley, and D. J. Chwirut. 1975. “Analysis of composite-reinforced cutouts and cracks.” AIAA J. 13 (6): 744–749. https://doi.org/10.2514/3.60431.
Naboulsi, S., and S. Mall. 1997. “Fatigue crack growth analysis of adhesively repaired panel using perfectly and imperfectly composite patches.” Theor. Appl. Fract. Mech. 28 (1): 13–28. https://doi.org/10.1016/S0167-8442(97)00027-X.
Poe, C. C. 1971. Fatigue crack propagation in stiffened panels. ASTM STP486. West Conshohocken, PA: ASTM.
Rans, C., R. Rodi, and R. Alderliesten. 2013. “Analytical prediction of Mode I stress intensity factors for cracked panels containing bonded stiffeners.” Eng. Fract. Mech. 97 (1): 12–29. https://doi.org/10.1016/j.engfracmech.2012.11.001.
Ratwani, M. M. 1979. “Analysis of cracked, adhesively bonded laminated structures.” AIAA J. 17 (9): 988–994. https://doi.org/10.2514/3.61263.
Rose, L. R. F. 1982. “A cracked plate repaired by bonded reinforcements.” Int. J. Fract. 18 (2): 135–144. https://doi.org/10.1007/BF00019638.
Schmidt, M., and H. Lipson. 2009. “Distilling free-form natural laws from experimental data.” Science 324 (5923): 81–85. https://doi.org/10.1126/science.1165893.
Swift, T. 1984. “Fracture analysis of stiffened structure.” In Damage tolerance of metallic structures: Analysis methods and applications, 69–107. West Conshohocken, PA: ASTM.
Ting, T., R. Jones, W. K. Chiu, I. H. Marshall, and J. M. Greer. 1999. “Composite repairs to rib stiffened panels.” Compos. Struct. 47 (1–4): 737–743. https://doi.org/10.1016/S0263-8223(00)00046-5.
Vlieger, H. 1973. “The residual strength characteristics of stiffened panels containing fatigue cracks.” Eng. Fract. Mech. 5 (2): 447–477. https://doi.org/10.1016/0013-7944(73)90033-7.
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©2019 American Society of Civil Engineers.
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Received: Aug 10, 2017
Accepted: Aug 13, 2018
Published online: Jan 28, 2019
Published in print: May 1, 2019
Discussion open until: Jun 28, 2019
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