Experimental analysis and modeling of the buckling of a loaded honeycomb sandwich composite

Abstract

Sandwich panels have the best stiffness-to-lightness ratio, which is what makes them very useful in industrial applications. This paper is focused on a study of the buckling capacities of the core components under uniaxial compression. The critical buckling loads for various core densities and materials of honeycomb panels were experimentally and numerically investigated. The specimens under lateral loading showed three zones: zone 1 is the initial elastic state, followed by the plateau region in zone 2, while zone 3 shows a monotonically stiffening region, associated with the densification of the material. The effect of the core density and its materials on the behavior and the damage was highlighted. From the experiment it is clear that the buckling load of the specimens increases as the core density is increasing. In terms of stiffness and load at failure, the honeycomb sandwich panel had better mechanical characteristics than its components. The study also calculated the numerical buckling loads of the panels using the ABAQUS finite-element analysis program. The achieved experimental and numerical results were compared with each other. In conclusion, a good correlation between theory and experiment was found. Keywords: honeycomb sandwich panel, buckling analysis, compression, finite-element method, collapse Sendvi~ni paneli imajo najbolj{e razmerje med togostjo in maso. To jih dela primerne za industrijsko uporabo. Ta~lanek je usmerjen v {tudij zdr`ljivosti za upogibanje klju~nih komponent pri enoosni tla~ni obremenitvi. Eksperimentalno in numeri~no so bile preiskane kriti~ne upogibne obremenitve za razli~ne klju~ne gostote in material satastih plo{~. Vzorci, stransko obremenjeni, so pokazali tri podro~ja: podro~je 1 je za~etno elasti~no stanje, ki mu sledi podro~je platoja, tj. podro~je 2. Podro~je 3 prikazuje monotono upogibanje, povezano z zgo{~evanjem materiala. Ocenjen je bil vpliv klju~ne gostote in materialov glede vedenja in po{kodb. Iz preizkusov je razvidno, da z nara{~anjem klju~ne gostote nara{~a tudi odpornost proti upogibni obremenitvi vzorcev. Glede na upogibanje in obremenitev pri poru{itvi ima satasta sendvi~na plo{~a bolj{e mehanske lastnosti v primerjavi z njenimi komponentami. V {tudiji je tudi izra~unana numeri~na upogibna obremenitev panelov z analizo kon~nih elementov s programom ABAQUS. Primerjani so dobljeni eksperimentalni in numeri~ni rezultati. Dobljena je bila dobra korelacija med teorijo in eksperimentalnimi rezultati. Klju~ne besede: satasta sendvi~na plo{~a, analiza upogibanja, tla~enje, metoda kon~nih elementov, poru{itev

Analytical Investigation of Buckling Behavior of Honeycombs Sandwich Combined Plate Structure

“…At (2015), A. Bentouhami et. al., [2], investigated the effect of buckling behavior of core component under compression load. Where the investigation included the estimation of the buckling load for core by two techniques, the first, was the experimental technique and the second was the numerical investigation, and then, a comparison of the results together was done.…”

“…Where, the comparison of the analytical and numerical results showed a good agreement of results with a maximum error about (2.24%). Finally, the results showed that the buckling load is modified by increasing the honeycomb core size. There, the upper and lower sheet plate could be used as metal or non-metal materials, [2]. Also, the honeycomb sandwich structure can be made from various materials types as metal, ceramic, composite materials etc.…”

Analysis of Honeycomb Structure

“…It was found that the yield stress by the finite element analysis in ANSYS/LS-DYNA on the structure is more than that of the experimental test done on the structure by 6.7% . The structural nonlinear was not considered due to which error occurred [1]. Surya Satish Adapa, et al the deflection variation in honeycomb sandwich structure is carried out.…”

On vibration isolation of sandwich plate with periodic hollow tube core

“…It is noted that many innovative designs and optimizations of PCs lead to wider BGs in lower frequency ranges [16,17], while for sandwich plates, the frequency band gaps are not wide and low enough [18–20] or the band gaps are lower while core materials are quite expensive [21]. It should also be pointed out that for periodic sandwich plates the vast majority of experiments concern more about strength, stiffness or buckling than vibration isolation [22–27]. In the present paper, a kind of PC sandwich plate with a periodic hollow tube core is investigated numerically and experimentally.…”