Process Factors and Edgewise Compressive Properties of Scarf-repaired Honeycomb Sandwich Structures
Source abstract
Abstract
Bonded repairs were conducted on flat and edge-closed composite sandwich panels that had undergone different levels of initial damage, and edgewise compression behaviors of repaired panel were tested. Experimental results indicate that these repair techniques can restore the compression performance of damaged panels effectively. The repaired specimens recovered an average of over 83 % of their strength. A k-sample Anderson-Darling test was used to analyze the influence of various parameters, including curing temperature, curing pressure, and repair configurations. After a thorough comparison, it was concluded that a high-temperature, high-pressure treatment can improve the mechanical performance of repaired panels, but the improvement is closely related to the structural complexity of the repaired region. A double-side repair scheme could be used to prevent the degradation of mechanical performance caused by the additional bending moment. The conclusions drawn in the present study provide further insight into the mechanical performance of repaired sandwich panels under edgewise compressive loads. These data facilitate the improved design methodology on bonded repair of composite sandwich structures.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Mechanical Behavior of Composites · Cellular and Composite Structures · Epoxy Resin Curing Processes
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (23)
Show source-provided references
1. Boeing Ltd.: Boeing 737-800 Structural Repair Manual, Chicago (2006)
2. Airbus Ltd.: Airbus A320 Structural Repair Manual, Toulouse (2007)
3. Stone, R.H.: Repair techniques for graphite/epoxy structures for commercial transport applications, NAS1-15269 (1983)
4. Jones, J.S., Graves, S.R.: Repair Techniques for Celion-LARC-160 Graphite-Polyimide Composite Structures, NAS1-16448 (1984)
5. Armstrong, K.B., Bevan, L.G., Cole, W.F.: Care and Repair of Advanced Composites, 2nd edn. SAE international, Warrendale (2005)10.4271/R-336 ↗
6. Found, M.S., Friend, M.J.: Evaluation of CFRP panels with scarf repair patches. Compos. Struct. 32, 115–122 (1995)10.1016/0263-8223(95)00045-3 ↗
7. Baker, A.A., Chester, R.J., Hugo, G.R., et al.: Scarf repairs to highly strained graphite/epoxy structure. Int. J. Adhes. Adhes. 19, 161–171 (1999)10.1016/S0143-7496(98)00031-1 ↗
8. Gunnion, A.J., Herszberg, I.: Parametric study of scarf joints in composite structures. Compos. Struct. 75, 364–376 (2006)10.1016/j.compstruct.2006.04.053 ↗
9. Hamoush, S., Shivakumar, K., Darwish, F., et al.: Defective repairs of laminated solid composites. J. Compos. Mater. 39, 2185–2196 (2005)10.1177/0021998305052036 ↗
10. Wang, C.H., Gunnion, A.J.: On the design methodology of scarf repair to composite laminates Compos. Sci. Technol. 68, 35–46 (2008)10.1016/j.compscitech.2007.05.045 ↗
11. Whittingham, B., Baker, A.A., Harman, A., et al.: Micrographic studies on adhesively bonded scarf repairs to thick composite aircraft structure. Compos. A Appl. S. 40, 1419–1432 (2009)10.1016/j.compositesa.2008.12.011 ↗
12. Campilho, R.D.S.G., Rocha, J.M.M.: Strength prediction of adhesively bonded repairson carbon-epoxy laminates by the single and double-strap techniques. Polym. Compos. 32, 1254–1264 (2011)10.1002/pc.21145 ↗
13. Avery, J.L., Sankar, B.V.: Compressive failure of sandwich beams with debonded face-sheets. J. Compos. Mater. 34, 1176–1199 (2000)10.1177/002199830003401402 ↗
14. Hansen, I.: Compression behavior of FRP sandwich specimen with interface debonded. J. Compos. Mater. 32, 335–360 (1998)10.1177/002199839803200402 ↗
15. Wang, H., Chen, X.H., Guo, X.L., et al.: Strength investigation of composite honeycomb structures after repair. Chin. J. Aeronaut. 22, 270–273 (2001)
16. Chen, J.Y.: Predicting progressive delamination of stiffened fibre-composite panel and repaired sandwich panel by decohesion models. J. Thermoplast. Compos. 15, 429–442 (2002)10.1177/0892705702015005736 ↗
17. Mahdi, S., Kinloch, A.J., Matthews, F.L., et al.: The static mechanical performance of repaired composite sandwich beams: part I – experimental characterization. J. Sandw. Struct. Mater. 5, 179–202 (2003)10.1177/1099636203005002108 ↗
18. Mahdi, S., Kinloch, A.J., Matthews, F.L., et al.: The static mechanical performance of repaired composite sandwich beams: part II – finite element modeling. J. Sandw. Struct. Mater. 5, 267–303 (2003)10.1177/1099636203005003004 ↗
19. Tomblin, J.S., Salah, L., Welch, J.M., et al.: Bonded Repair of Aircraft Composite Sandwich Structures, DOT/FAA/AR-03/74, Washington (2004)
20. Tomblin, J.S., Lacy, T., Smith, B., et al.: Review of Damage Tolerance for Composite Sandwich Airframe Structures, DOT/FAA/AR-99/49, Washington (1999)
21. Scholz, F.W., Stephens, M.A.: K-sample Anderson-Darling tests. J. Am. Stat. Assoc. 82, 918–924 (1987)
22. CMH-17 Org.: Composite Materials Handbook, vol. 1. SAE international, Warrendale (2012)
23. Aviation Industry Corporation of China: HB 7618-2099, Beijing (2009)