A protocol for characterizing the structural performance of metallic sandwich panels: application to pyramidal truss cores

Zok, Frank W.; Waltner, S.A.; Wei, Zhiyong; Rathbun, H.J.; McMeeking, Robert M.; Evans, A.G.

doi:10.1016/j.ijsolstr.2004.05.045

Cited by 251 publications

(131 citation statements)

References 10 publications

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“…Specimen geometry. Solid truss pyramidal lattice structures were fabricated via a folding operation that bends a diamond perforated sheet to create a single layer of trusses arranged with a pyramidal topology [Zok et al 2004b;Queheillalt and Wadley 2005;McShane et al 2006;Cote et al 2007]. Briefly, the process consisted of punching a metal sheet to form a periodic diamond perforation pattern, folding node row by node row using a paired punch and die tool set, and then brazing this core to solid face sheets to form the sandwich structure.…”

Section: Pyramidal Lattice Panelsmentioning

confidence: 99%

Deformation and fracture modes of sandwich structures subjected to underwater impulsive loads

Mori

Lee

Xue

et al. 2007

JOMMS

101

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Sandwich panel structures with thin front faces and low relative density cores offer significant impulse mitigation possibilities provided panel fracture is avoided. Here steel square honeycomb and pyramidal truss core sandwich panels with core relative densities of 4% were made from a ductile stainless steel and tested under impulsive loads simulating underwater blasts. Fluid-structure interaction experiments were performed to (i) demonstrate the benefits of sandwich structures with respect to solid plates of equal weight per unit area, (ii) identify failure modes of such structures, and (iii) assess the accuracy of finite element models for simulating the dynamic structural response. Both sandwich structures showed a 30% reduction in the maximum panel deflection compared with a monolithic plate of identical mass per unit area. The failure modes consisted of core crushing, core node imprinting/punch through/tearing and stretching of the front face sheet for the pyramidal truss core panels. Finite element analyses, based on an orthotropic homogenized constitutive model, predict the overall structural response and in particular the maximum panel displacement.

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Section: Pyramidal Lattice Panelsmentioning

confidence: 99%

Deformation and fracture modes of sandwich structures subjected to underwater impulsive loads

Mori

Lee

Xue

et al. 2007

JOMMS

101

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“…As the core relative density is decreased, the quasi-static strength of cores made from trusses begins to exceed that of the honeycomb webs because of their higher buckling resistance [21,22]. This has stimulated interest in the dynamic response of sandwich panel structures with lattice truss core topologies [23][24][25][26][27] even though they have limited stretch resistance [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Response of metallic pyramidal lattice core sandwich panels to high intensity impulsive loading in air

Dharmasena

Wadley

Williams³

et al. 2011

International Journal of Impact Engineering

122

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Small scale explosive loading of sandwich panels with low relative density pyramidal lattice cores have been used to study the large scale bending and fracture response of a model sandwich panel system in which the core has little stretch resistance. The panels were made from a ductile stainless steel and the practical consequence of reducing the sandwich panel face sheet thickness to induce a recently predicted beneficial fluidstructure interaction (FSI) effect was investigated. The panel responses are compared to those of monolithic solid plates of equivalent areal density. The specific impulse imparted to the panels was varied from1.5 to 7.6 kPa.s by changing the standoff distance between the charge center and the front face of the panels. A decoupled finite element model has been used to computationally investigate the dynamic response of the panels.It predicts panel deformations well and is used to identify the deformation time sequence and the face sheet and core failure mechanisms. The study shows that efforts to use thin face sheets to exploit FSI benefits are constrained by dynamic fracture of the front face and that this failure mode is in part a consequence of the high strength of the inertially stabilized trusses. Even though the pyramidal lattice core offers little in-plane stretch resistance, and the FSI effect is negligible during loading by air, the sandwich panels are found to suffer slightly smaller back face deflections and transmit smaller vertical component forces to the supports compared to equivalent monolithic plates.

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“…More impressively, the present eggbox panels perform better than structurally advanced steel architectures such as pyramidal trusses and out-of-plane loaded square honeycombs, known to be much more resistant to elastic buckling than the egg-box architecture. [13][14][15] The ability of the MGMC egg-box panels to outperform panels with architectures inherently much stronger is attributed to the unusually high strength and toughness of the MGMC enabling extensive plastic collapse at very high plateau stresses. Therefore, in terms of structural performance and ease of fabrication ͑and not counting other factors such as material cost etc.͒, one may conclude that MGMCs are attractive materials for cellular structure fabrication.…”

Section: Fig 1 ͑Color Online͒mentioning

confidence: 99%

Metallic-glass-matrix composite structures with benchmark mechanical performance

Schramm

Hofmann

Demetriou

et al. 2010

Applied Physics Letters

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Metallic-glass-matrix composites demonstrating unusual combination of high strength, high toughness, and excellent processability are utilized to fabricate cellular structures of egg-box topology. Under compressive loading, the egg-box panels are capable of undergoing extensive plastic collapse at very high plateau stresses enabling absorption of large amounts of mechanical energy. In terms of specific mechanical energy absorbed, the present panels far outperform panels of similar topology made of aluminum or fiber-reinforced polymer composites, and even surpass steel structures of highly buckling-resistant topologies, thus emerging among the highest performance structures of any kind.

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A protocol for characterizing the structural performance of metallic sandwich panels: application to pyramidal truss cores

Cited by 251 publications

References 10 publications

Deformation and fracture modes of sandwich structures subjected to underwater impulsive loads

Deformation and fracture modes of sandwich structures subjected to underwater impulsive loads

Response of metallic pyramidal lattice core sandwich panels to high intensity impulsive loading in air

Metallic-glass-matrix composite structures with benchmark mechanical performance

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