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Experimental and numerical study on the failure of sandwich T-joints under pull-off loading
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 Title & Authors
Experimental and numerical study on the failure of sandwich T-joints under pull-off loading
Nguyen, Khanh-Hung; Park, Yong-Bin; Kweon, Jin-Hwe; Choi, Jin-Ho; Shul, Chang-Won; Yang, Myung-Seog; Jun, Seung-Moon;
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 Abstract
In this study, the failure mechanism of sandwich-to-laminate T-joints under pull-off loading was investigated by experiment and the finite element method. A total of 26 T-joint specimens were manufactured and tested in order to investigate the effects of both adhesive thickness (0.4, 2.0, and 4.0 mm) and environmental conditions on the failure of the joints. The results showed that failure occurred mainly as intralaminar failure in the first layer of the sandwich face, which was contacted to the paste adhesive. The failure load did not significantly change with increasing adhesive thickness in both RTD (Room Temperature and Dry) and ETW (Elevated Temperature and Wet) conditions. In the case of ETW conditions, however, the failure load increased slightly with an increase in adhesive thickness. The joints tested in ETW conditions had higher failure loads than those tested in RTD conditions. In addition to the experiment, a finite element analysis was also conducted to investigate the failure of the joint. The stress inside the first ply of the sandwich face was of interest because during the experiment, failure always occurred there. The analysis results showed good agreement with the trend of experimental results, except for the case of the smallest adhesive thickness. The highest stress was predicted in the regions where initial failure was observed in the experiment. The maximum stress was almost constant when the adhesive thickness was beyond 2 mm.
 Keywords
T-joints;sandwich structures;Nomex core;temperature;humidity;
 Language
English
 Cited by
 References
1.
Banea, M.D., and Sliva, L.F.M.d., "Adhesively bonded joints in composite materials: An overview", Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications, Vol. 233, No. 1, 2009, pp. 1-18.

2.
Toftegaard, H., and Lystrup, A., "Design and test of lightweight sandwich T-joint for navalships", Composites Part A: Applied Science and Manufacturing, Vol. 36, 2005, pp. 1055-1065. crossref(new window)

3.
Khalili, S.M.R., and Ghaznavi, A., "Numerical analysis of adhesively bonded T-joints with structural sandwiches and study of design parameters", International Journal of Adhesion and Adhesives, Vol. 31, 2011, pp. 347-356. crossref(new window)

4.
Silva, L.F.M.d., and Adams, R.D., "The strength of adhesively bonded T-joints", International Journal of Adhesion and Adhesives, Vol. 22, 2002, pp. 311-315. crossref(new window)

5.
Baldi, A., Airoldi, A., Crespi, M., Iavarone, P., and Bettini, P., "Modelling competitive delamination and debonding phenomena in composite T-Joints", Procedia Engineering, Vol. 10, 2011, pp. 3483-3489. crossref(new window)

6.
Castagnetti, D., Dragoni, E., and Spaggiari, A., "Failure analysis of bonded T-peel joints: Efficient modelling by standard finite elements with experimental validation", International Journal of Adhesion and Adhesives, Vol. 30, 2010, pp. 306-312. crossref(new window)

7.
Dharmawana, F., Li, H.C.H., Herszberg, I., and John, S., "Applicability of the crack tip element analysis for damageprediction of composite T-joints", Composite Structures, Vol. 86, 2008, pp. 61-68. crossref(new window)

8.
Kesavan, A., Deivasigamani, M., John, S., and Herszberg, I., "Damage detection in T-joint composite structures" Composite Structures, Vol. 75, 2006, pp. 313-320. crossref(new window)

9.
Bordes, M., Cognard, J.-Y, Sohier, L., and Sauvant-Moynot, V., "Prediction of long term strength of adhesively bonded steel/epoxy joints in sea water", International Journal of Adhesion and Adhesives, Vol. 29, 2009, pp. 595-608. crossref(new window)

10.
Court, R.S., Sutcliffe, M.P.F. , and Tavakoli, S.M., "Ageing of adhesively bonded joints-fracture and failure analysis using video imaging techniques", International Journal of Adhesion and Adhesives, Vol. 21, 2001, pp. 455-463. crossref(new window)

11.
Tomblin, J., Sherraden, J., Seneviratne, W., and Raju, K.S., "A-Basis and B-Basis Design Allowable for Epoxy-Based prepreg TORAY T700SC-12K-50C/#2510 Plain Weave Fabric", Advanced General Aviation Transport Experiments, AGATEWP3.3-033051-134, October 2002.

12.
Fenske, M.T. and Vizzini, A.J.,"The inclusion of inplane stresses in delamination criteria", Journal of Composite Materials, Vol. 35, 2001, pp.1325-1342.

13.
Tomblin, J., Sherraden, J., Seneviratne, W., and Raju, K.S., "A-Basis and B- Basis Design Allowables for Epoxy-Based Prepreg TORAY T700GC-12K-31E/#2510 Unidirectional Tape", Advanced General Aviation Transport Experiments, AGATE-WP3.3-033051-132, November 2002.