Failure of sandwich beams with metallic foam cores

McCormack, Timothy M.; Miller, Ronald Mellado; Kesler, Olivera; Gibson, Lorna

doi:10.1016/s0020-7683(00)00327-9

Cited by 205 publications

(104 citation statements)

References 9 publications

Supporting

Mentioning

103

Contrasting

Order By: Relevance

“…Instead, the deflection is distributed along the length of the sandwich panel homogeneously. Whereas sandwich panels with foam cores typically fail via face yield, core shear, indentation, delamination and face wrinkle [5], the auxetic sandwich panels failed by fracture of vertical struts under the combination of bending and tension. Failure occurred at the vertical struts located roughly at the middle section between the loading roller and the support roller where the local deformation was at its maximum as seen in Figure 7(a).…”

Section: Resultsmentioning

confidence: 99%

“…These structures have been shown to exhibit significantly improved shear performance compared with regular structures [2][3][4]. According to the theory of elasticity, the shear modulus of negative Poisson's ratio structures could become even larger than the bulk moduli, making the structures ideal for use in sandwich panel cores [5][6][7]. Furthermore, auxetic structures exhibit synclastic bending [8][9], which also favors their potential applications in curved sandwich panels and sandwich skins for various applications.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Comparison of Bending Properties for Cellular Core Sandwich Panels

Yang¹,

Harrysson²,

West³

et al. 2013

MSA

View full text Add to dashboard Cite

In this study, various sandwich panel structures with different reticulate lattice core geometries were designed and then fabricated in titanium via the electron beam melting (EBM) process. Bending tests were performed on the titanium samples, and mechanical properties such as modulus, bending strength, and energy absorption were evaluated. Different failure mechanisms were observed, and it was found that sandwich structures with auxetic cores exhibited more homogeneous deflection and bending compliance compared with other structures. It was also demonstrated that properties of auxetic sandwich structures can be tailored using different cell structure geometries to suit the needs of a given design application. Furthermore, it was found that other 3D cellular sandwich structures can also exhibit high stiffness and strength, which is desirable in potential applications.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Comparison of Bending Properties for Cellular Core Sandwich Panels

Yang¹,

Harrysson²,

West³

et al. 2013

MSA

View full text Add to dashboard Cite

show abstract

“…An important application of such ultralight foam is serving as crashworthy component, such as fillers in the tubular structures [1][2][3][4][5][6] and cores in the laminated sandwiches [7][8][9][10][11]. In addition to the lightweight and high specific energy absorption (energy absorbed per unit weight), the low strengths and large plastic strains, which usually mean attenuated acceleration and elongated crushing distance during an impact event, make foams very attractive for energy absorbing applications.…”

Section: Introductionmentioning

confidence: 99%

Fracture mechanisms and size effects of brittle metallic foams: In situ compression tests inside SEM

Song

Xie

et al. 2008

Composites Science and Technology

View full text Add to dashboard Cite

a b s t r a c tIn situ compressive tests on specially designed small samples made from brittle metallic foams were accomplished in a loading device equipped in the scanning electron microscopy (SEM). Each of the small samples comprises only several cells in the effective test zone (ETZ), with one major cell in the middle. In such a system one can not only obtain sequential collapse-process images of a single cell and its cell walls with high resolution, but also correlate the detailed failure behaviour of the cell walls with the stressstrain response, therefore reveal the mechanisms of energy absorption in the mesoscopic scale. Meanwhile, the stress-strain behaviour is quite different from that of bulk foams in dimensions of enough large, indicating a strong size effect. According to the in situ observations, four failure modes in the cell-wall level were summarized, and these modes account for the mesoscopic mechanisms of energy absorption. Paralleled compression tests on bulk samples were also carried out, and it is found that both fracturing of a single cell and developing of fracture bands are defect-directed or weakness-directed processes. The mechanical properties of the brittle aluminum foams obtained from the present tests agree well with the size effect model for ductile cellular solids proposed by Onck et al.

show abstract

“…Soden [3] assumed the face sheets to be rigid-perfectly plastic and perfectly predicted face yield through linear elastic theory. McCormack et al [4] drawn the collapse mechanism maps of metallic foam sandwich panels and compared the collapse load with the first peak value of curve. Chen et al [5] researched the collapse mechanisms and the weight-efficient of metallic foam sandwich panels in a four point bending.…”

Section: Introductionmentioning

confidence: 99%

Analysis on Collapse Mechanisms and Weight-efficient of Sandwich Circular Panel

Xia¹,

Zhang²,

Zhou³

et al. 2017

Proceedings of the 3rd Annual International Conference on Mechanics and Mechanical Engineering (MME 2016)

View full text Add to dashboard Cite

Abstract. Sandwich circular panel with foam core indented by flat-end cylindrical indenter was constructed. Collapse mechanisms and influencing factors of sandwich circular panel was determined, and the mass of sandwich circular panel was lightened through theoretical analysis. The theoretical predictions were verified by comparing with results from commercial code ABAQUS. Results indicate that collapse mechanisms map of sandwich circular panels is similar to beam (panel) in a three-point bend besides the regional boundaries. The maximum material utilization rate of each collapse mechanism is located in the boundaries. The maximum material utilization of all Collapse mechanisms is located in the common point which belong to the face yield mode of collapse, the indentation mode of collapse and the mode B for core shear.

show abstract

Failure of sandwich beams with metallic foam cores

Cited by 205 publications

References 9 publications

A Comparison of Bending Properties for Cellular Core Sandwich Panels

A Comparison of Bending Properties for Cellular Core Sandwich Panels

Fracture mechanisms and size effects of brittle metallic foams: In situ compression tests inside SEM

Analysis on Collapse Mechanisms and Weight-efficient of Sandwich Circular Panel

Contact Info

Product

Resources

About