Experimental Study on Static and Dynamic Response of Aluminum Honeycomb Sandwich Structures

Ciepielewski, Radosław; Gieleta, Roman; Miedzińska, Danuta

doi:10.3390/ma15051793

Cited by 16 publications

(20 citation statements)

References 28 publications

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“…These are significant differences, thus the change in the model’s geometry should be taken into account in simulations. A comparison of the discussed characteristics, with reference to those obtained experimentally [ 21 ], is presented in Figure 9 .…”

Section: Modelsmentioning

confidence: 92%

“…Such an approach has allowed us to obtain valuable results from FEM analysis, based on material models of the MAT_HONEYCOMB type, across a wide range of strain rates, thus minimizing the need for experimental research. The authors of [ 21 ] present experimental studies on the static and dynamic compression of honeycomb structures. The conclusion we drew from their work was that the strengthening of the structure is related to the volume of air trapped inside the closed cells.…”

Section: Introductionmentioning

confidence: 99%

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A Study of Aluminum Honeycomb Structures under Dynamic Loading, with Consideration Given to the Effects of Air Leakage

Ciepielewski

Miedzińska

2023

Materials

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Aluminum honeycomb structures are used in the construction of protective materials due to the positive relationship between their mass and their energy-absorbing properties. Applying such materials in the construction of large machinery, such as military vehicles, requires the development of a new method of finite element modeling, one that considers conditions with high strain rates, because a material model is currently lacking in the available simulation software, including LS-DYNA. In the present study, we proposed and verified a method of numerically modeling honeycomb materials using a simplified Y element. Results with a good level of agreement between the full core model and the Y element were achieved. The obtained description of the material properties was used in the subsequent creation of a homogeneous model. In addition, we considered the influence of increases in pressure and the leakage of the air entrapped in the honeycomb cells. As a result, we were able to attain a high level of accuracy regarding the stress values across the entire range of progressive failure, from the loss of stability to full core densification, and across a wide range of strain rates.

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Section: Modelsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

A Study of Aluminum Honeycomb Structures under Dynamic Loading, with Consideration Given to the Effects of Air Leakage

Ciepielewski

Miedzińska

2023

Materials

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“…In general, a sandwich structure is composed of solid face and back plates, and a lightweight cellular core. While the cellular core absorbs a considerable amount of energy, various types of cores with excellent energy absorption capacity have been proposed, for instance, metal foam core [ 11 , 12 ], polymeric foam core [ 13 , 14 ], foam concrete core [ 15 , 16 , 17 ], honeycomb core [ 18 ], negative Poisson’s ratio honeycomb core [ 19 ], foam-filled honeycomb core [ 20 , 21 ], and other high-performance cores [ 22 ]. The mechanical performance and energy absorption of these core materials or structures subjected to quasi-static and dynamic loads have been extensively and intensively investigated based on the approaches of experimental tests, numerical simulations, and theoretical analyses.…”

Section: Introductionmentioning

confidence: 99%

In-Plane Impact Response of Graded Foam Concrete-Filled Auxetic Honeycombs

Wang

Jia²,

Liu³

et al. 2023

Materials

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Foam-filled honeycombs have been widely applied due to their excellent load transfer mitigation and energy absorption capacity. In the present study, a layered graded foam concrete-filled auxetic honeycomb was proposed by tuning its overall compression deformation mode to layer-by-layer deformation mode to realize multi-level structural protection. The effect of the honeycomb cell-wall thickness gradient (with an average thickness of 0.25 mm, thickness gradients of 0.30:0.25:0.20, 0.35:0.25:0.15 and 0.40:0.25:0.10, and corresponding positive gradients) and the foam concrete filler density gradient (408:575:848, 848:575:408) on the response mode, load transfer, energy absorption, and Poisson’s ratio of the proposed composite was systematically investigated. The results showed that the graded composite exhibited an obvious layered deformation mode and a negative Poisson’s ratio effect under relatively low and moderate loading rates (1 m/s, 10 m/s, respectively), especially with the foam concrete density gradient. Under a high loading rate (100 m/s), the graded composite demonstrated progressive collapse initiating from the loading end with a layer-by-layer crushing mode, regardless of the thickness and density gradient. In the response of the composite with a 0.2:0.2:0.2 thickness ratio and a 408:575:848 foam concrete gradient subjected to 1 m/s crushing, the first-layer, second-layer, and third-layer foam concrete absorbed 94.62%, 88.72%, and 86.94% of the total foam concrete energy absorption in the corresponding crushing stage, respectively. Compared with the counterpart homogeneous composites, although the graded composite had an insignificant improvement on energy absorption (less than 5%), it was able to significantly reduce the peak load (as high as 30%) to mitigate the load transfer to the protected structure. The effective Poisson’s ratio of the first layer in the composite with positive gradient (408:575:848) increased to −2 then converged to −0.6 under 2 m/s and 10 m/s crushing, and ranged from −0.4 to −0.1 under 50 m/s and 100 m/s crushing, respectively. The effective Poisson’s ratio of the middle and bottom layers increased to −2 initially and converged to range −0.4 to −0.1, regardless of the crushing speed. The staged response mode of the graded composite facilitated the realization of multi-level structure protection with significantly reduced peak load transferred to the protected structure and tuned energy absorption.

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“…Aluminium alloy honeycomb structures generally consist of cellular cores and facesheets and have been extensively applied in the aerospace, transport and medical industries, due to their favorable properties of high energy-absorbing rate, great strength-to-weight ratio, good corrosion resistance and high specific strength and stiffness [ 1 , 2 , 3 ]. The mechanical properties of this kind of structure, including the out-of-plane and in-plane compression resistances, bending behaviour and energy dissipation capacities subjected to impact or quasi-static loadings, have been experimentally and numerically investigated by many researchers.…”

Section: Introductionmentioning

confidence: 99%

Out-of-Plane Compression Behaviour of Aluminum Alloy Large-Scale Super-Stub Honeycomb Cellular Structures

et al. 2023

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The out−of−plane compression behaviour of 6061−T6 aluminum alloy super−stub honeycomb cellular structures without and with friction stir welding (FSW) facesheets are presented in this paper. A total of twelve axially compressed experiments on large−scale specimens, six with square hollow section (SHS) cores and six with hexagonal hollow section (HHS) cores, were conducted, with failure modes, ultimate resistances and axial load−end shortening curves analysed. The accuracy of finite element (FE) models was validated in accordance with test results. The numerical data obtained from extensive parametric analyses combined with test data were subsequently used to evaluate the applicability of existing design rules in Chinese, European and American aluminium alloy specifications. The results showed that the three specifications generally yielded very conservative predictions for the out−of−plane compression resistances of SHS and HHS super−stub honeycomb cores without and with FSW facesheets by about 30–37%. Design recommendations on the cross−section effective thickness are finally proposed and shown to provide much more accurate and consistent predictions than current design methods. The research results are beneficial to the application and development of large−scale super−stub honeycomb structures in structural engineering, such as the helicopter landing platforms, the base of fluid and gas tanks and ship decks.

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Experimental Study on Static and Dynamic Response of Aluminum Honeycomb Sandwich Structures

Cited by 16 publications

References 28 publications

A Study of Aluminum Honeycomb Structures under Dynamic Loading, with Consideration Given to the Effects of Air Leakage

A Study of Aluminum Honeycomb Structures under Dynamic Loading, with Consideration Given to the Effects of Air Leakage

In-Plane Impact Response of Graded Foam Concrete-Filled Auxetic Honeycombs

Out-of-Plane Compression Behaviour of Aluminum Alloy Large-Scale Super-Stub Honeycomb Cellular Structures

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