Homogenization of sandwich structures

Rabczuk, Timon; Kim, J. Y.; Samaniego, Esteban; Belytschko, Ted

doi:10.1002/nme.1100

Cited by 90 publications

(66 citation statements)

References 7 publications

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“…Recent experiments have shown that the back face deflections of centrally loaded edge clamped sandwich panels can be significantly less than equivalent areal density solid plates subjected to the same loading [3][4][5][6][7][8]. Theoretical assessments indicate this beneficial effect arises from two phenomena: a reduction in the impulse acquired by the sandwich panel front face as a result of a fluid-structure interaction (FSI) effect [3,4,[8][9][10] and the higher flexural stiffness and strength of the sandwich.…”

Section: Introductionmentioning

confidence: 99%

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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

120

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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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Section: Introductionmentioning

confidence: 99%

“…After the beneficial FSI effect had been confirmed in water [2][3][4][5][6][7][8], numerous sandwich panel concepts for impulse and pressure mitigation have been explored [7][8][9][10][11][12][13][14][15][16][17].…”

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

120

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“…The model was used with finite elements to represent the behavior of square honeycomb sandwich plates [Xue et al 2005], folded plate and pyramidal truss cores , and hexagonal honeycomb cores [Mohr et al 2006] subjected to quasistatic and dynamic loads. Rabczuk et al [2004] developed a homogenization method for sandwich structures using a quasicontinuum approach that takes into account buckling of the core; this model shows good agreement with fully discretized models for shell interlaced cores. Qiu et al [2004;2005a] developed an analytical model for the deformation response of clamped circular sandwich plates subjected to shock loading in air and in water.…”

Section: Introductionmentioning

confidence: 99%

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

Mori

Lee

Xue

et al. 2007

JOMMS

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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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“…Fleck and Deshpande [6] have developed an analytical model for the impact resistance of clamped sandwich beams by separating the response of these beams into three sequential stages: the fluid-structure interaction stage, the core compression stage and finally a combined beam bending and stretching stage. Some FE simulations [9,13] indicated that the Fleck and Deshpande model may over-estimate or under-estimate the deflection of the sandwich beams under blast loading. These discrepancies have been attributed to the fact that coupling between the stages of the response can cause enlarged or reduced deflections compared with those predicted by the fully decoupled Fleck and Deshpande model.…”

Section: Structural Response Processmentioning

confidence: 99%

The mechanical response of metallic sandwich beams under foam projectile impact loading

Jing

Wang

Ning

et al. 2011

Lat. Am. j. solids struct.

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The dynamic response of the clamped sandwich beams was investigated by impacting the beams at mid-span with metal foam projectiles. Effects of applied impulse, face-sheet thickness and core thickness on the impact resistance of sandwich beams are discussed. Using strain gauge measurement technique, the deformation mechanism of sandwich beams was analyzed in the paper. The results indicate that the structural response is sensitive to the configuration of sandwich structures. Based on the experiments, corresponding finite element simulations have been undertaken using the LS-DYNA software. A good agreement has been obtained between the numerical and experimental results. The deformation and failure modes of sandwich beams under impact loading are presented, i.e. large inelastic deformation, core compression and core shear with interfacial failure. Numerical results also show that the velocity-time histories of the mid-span of the front and back sheet of sandwich beams are related to not only core strength but also core thickness. The research results are of worth to the theoretical prediction of the dynamic response of metallic sandwich beam.

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Homogenization of sandwich structures

Cited by 90 publications

References 7 publications

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

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

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

The mechanical response of metallic sandwich beams under foam projectile impact loading

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