Experimental research of the failure mechanisms of sandwich specimens with facing layers from unidirectional fiber-reinforced plastic with $[0^\circ]$ lay-up under axial compression

S. A. Kholmogorov   ; N. V. Levshonkova

Učënye zapiski Kazanskogo universiteta. Seriâ Fiziko-matematičeskie nauki, Uchenye Zapiski Kazanskogo Universiteta. Seriya Fiziko-Matematicheskie Nauki, Tome 164 (2022) no. 4, pp. 357-370

Résumé

An experimental technique was developed for the compression testing of sandwich specimens with thin fiber-reinforced composite facing layers. It assumes that thin layers of a composite material are tested, and their specimens, even with a very short gage length, become unstable, thereby distorting the ultimate stress value. Here, we discuss the results of our experimental studies of the failure mechanisms of sandwich specimens with facing layers having ${[0^\circ]}$ lay-up under axial compression. It was revealed that the shear buckling mode is possible in specimens with different geometrical parameters so that the ultimate stress formed in the facing layers can be taken as a mechanical characteristic when calculating the strength of composite structures. It was shown that an in-phase flexural buckling mode occurs under compression of specimens having a honeycomb core in their facing layers. A non-classical shear buckling mode is only possible in specimens with a rigid balsa core.

Détail

Keywords: fiber-reinforced composite, sandwich specimen, transversely flexible core, shear buckling mode.
Mots-clés : axial compression

Bibliographie

[1] Petras A., Sutcliffe M.P.F., “Failure mode maps for honeycomb sandwich panels”, Compos. Struct., 44:4 (1999), 237–252 | DOI

[2] Rupp P., Elsner P., Weidenmann Kay A., “Failure mode maps for four-point-bending of hybrid sandwich structures with carbon fiber reinforced plastic face sheets and aluminum foam cores manufactured by a polyurethane spraying process”, J. Sandwich Struct. Mater., 21:8 (2019), 2654–2679 | DOI

[3] Shi H., Liu W., Fang H., “Damage characteristics analysis of GFRP-Balsa sandwich beams under four-point fatigue bending”, Composites, Part A, 109 (2018), 564–577 | DOI

[4] Sokolinsky V.S., Shen H., Vaikhanski L., Nutt S.R., “Experimental and analytical study of nonlinear bending response of sandwich beams”, Compos. Struct., 60:2 (2003), 219–229 | DOI

[5] Jiang B., Li Zh., Lu F., “Failure mechanisms of sandwich beams subjected to three-point bending”, Compos. Struct., 133 (2015), 739–745 | DOI

[6] Fathi A., Woff-Fabris F., Altstädt V., Gätzi R., “An investigation of the flexural properties of balsa and polymer foam core sandwich structures: Influence of core type and contour finishing options”, J. Sandwich Struct. Mater., 15:5 (2013), 487–508 | DOI

[7] Alila F., Fajoui J., Gerard R., Casari P., Kchaou M., Jacquemin F., “Viscoelastic behaviour investigation and new developed laboratory slamming test on foam core sandwich”, J. Sandwich Struct. Mater., 22:6 (2020), 2049–2074 | DOI

[8] Piovár S., Kormaníková E., “Sandwich beam in four-point bending test: Experiment and numerical models”, Adv. Mater. Res., 969 (2014), 316–319 | DOI

[9] Russo A., Zuccarello B., “Experimental and numerical evaluation of the mechanical behaviour of GFRP sandwich panels”, Compos. Struct., 81:4 (2007), 575–586 | DOI

[10] Crupi V., Epasto G., Guglielmino E., “Comparison of aluminium sandwiches for lightweight ship structures: Honeycomb vs. foam”, Mar. Struct., 30 (2013), 74–96 | DOI

[11] Paimushin V.N., Makarov M.V., Badriev I.B., Kholmogorov S.A., “Geometrically nonlinear strain and buckling analysis of sandwich plates and shells reinforced on their edge”, Shell Structures: Theory and Applications, v. 4, CRC Press, London, 2017, 267–270 | DOI | MR

[12] Badriev I.B., Makarov M.V., Paimushin V.N., “Solvability of physically and geomentrically nonlinear problem of the theory of sandwich plates with transversally-soft core”, Russ. Math., 59:10 (2015), 57–60 | DOI | MR | Zbl

[13] Budiansky B., Fleck N.A., “Compressive failure of fibre composites”, J. Mech. Phys. Solids, 41:1 (1993), 183–211 | DOI

[14] Jumahat A., Soutis C., Jones F.R., Hodzic A., “Fracture mechanisms and failure analysis of carbon fibre/toughened epoxy composites subjected to compressive loading”, Compos. Struct., 92:2 (2010), 295–305 | DOI

[15] Paimushin V.N., Tralakovskii D.V., Kholmogorov S.A., “On non-classical buckling mode and failure of composite laminated specimens under the three-point bending”, Uchenye Zapiski Kazanskogo Universiteta. Seriya Fiziko-Matematicheskie Nauki, 158, no. 3, 2016, 350–375 (In Russian) | MR

[16] Paimushin V.N., Kholmogorov S.A., Makarov M.V., Tarlakovskii D.V., Lukaszewicz A., “Mechanics of fiber composites: Forms of loss of stability and fracture of test specimens resulting from three-point bending tests”, Z. Angew. Math. Mech., 99:1 (2018), e201800063, 1–25 | DOI | MR

[17] Paimushin V.N., Gazizullin R.K., Polyakova N.V., Shishov M.A., “Sandwich shells with composite facings and transversally flexible core: Refined equations and buckling modes of specimens under four-point bending tests”, Multiscale Solid Mechanics, Advanced Structured Materials, 141, eds. Altenbach H., Eremeyev V.A., Igumnov L.A., Springer, Cham, 2021, 391–411 | DOI

[18] Polilov A.N., Etudes on Composite Mechanics, Fizmatlit, M., 2015, 320 pp. (In Russian)

[19] Paimushin V.N., Firsov V.A., Kholmogorov S.A., Makarov M.V., “Experimental investigations of failure of sandwich specimens with composite facing layers under four-point bending conditions”, Multiscale Solid Mechanics, Advanced Structured Materials, 141, eds. Altenbach H., Eremeyev V.A., Igumnov L.A., Springer, Cham, 2021, 377–390 | DOI