Analytical determination of the ultimate strength of sandwich beams

Theotokoglou, Efstathios E.

doi:10.1007/bf00134976

Cited by 19 publications

(8 citation statements)

References 6 publications

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“…As it is observed from Figures 7 and 8 we have the formation of an indentation zone which is associated with significant bending moments and compressive normal stresses at the upper face/core interface beneath the concentrated load, and with peak shear and tensile transverse normal stresses at the upper face-core interface near the edge of the indentation zone. The aforementioned conclusions are in good agreement with the results presented in [23][24][25][26]. As it is noticed in [26] and from Figure 7 in the nonlinear load-deflection range, if displacements become large, the indentation zone deepens, its width decreases, and local buckling waves form at the compressed face sheet (shape of deformation of the compressed face sheet) from the edge of the indentation zone.…”

Section: Numerical Results and Discussionsupporting

confidence: 91%

Numerical Study of Fractured Sandwich Composites under Flexural Loading

Theotokoglou

Hortis

Carlsson

et al. 2008

Jnl of Sandwich Structures & Materials

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Fatigue crack growth of foam core sandwich beams loaded in flexure has been investigated numerically. Extensive fatigue data from foam core sandwich composites under flexural loading were analyzed. A static finite element analysis is adopted for the uncracked sandwich beam in order to predict crack initiation positions. A face/core debond parallel to the beam axis is considered in accordance with experimental data. A static two-dimensional finite element analysis of the cracked sandwich beam is accounted for the evaluation of stress intensity factors at the crack tips investigating the crack growth behavior. In this way it is succeeded in making a significant contribution to understand the initiation and propagation of a fatigue crack in the foam core of sandwich beams loaded by flexural loading.

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Section: Numerical Results and Discussionsupporting

confidence: 91%

Numerical Study of Fractured Sandwich Composites under Flexural Loading

Theotokoglou

Hortis

Carlsson

et al. 2008

Jnl of Sandwich Structures & Materials

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“…Four main collapse modes have been identified for three point bending with cylindrical rollers: the face yield, wrinkling of the compressive face-sheet, core shear and indentation collapse modes. These mechanisms have been studied and verified extensively in the literature [41][42][43][44][45][46][47]. Since these calculations offer theoretical upper-bound estimates for the collapse load, mechanics of a composite beam [48] are employed instead.…”

Section: Analytical Predictionsmentioning

confidence: 99%

Syntactic foam core metal matrix sandwich composite under bending conditions

Omar¹,

Xiang²,

Gupta³

et al. 2015

Materials & Design

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The present work aims at characterizing a metal matrix syntactic foam core sandwich composite under threepoint bending conditions. The sandwich comprises alumina hollow particle reinforced A356 alloy syntactic foam with carbon fabric skins. Crack initiation in the tensile side of the specimen causing failure of the skin, followed by rapid failure of the core in the direction applied load, is observed as the failure mechanism. Crack propagation through the alumina particles is observed in the failed specimens instead of interfacial failure. The average maximum strength, flexural strain and stiffness were measured as 91.2 ± 5.6 MPa, 0.49 ± 0.06% and 20.6 ± 0.7 GPa respectively. The collapse load is theoretically predicted using mechanics of sandwich beams. Experimental values show good agreement with theoretical predictions.

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“…The failure mechanisms considered were face yielding, face wrinkling, core shear, core tensile yield, core compressive yield, core indentation, debonding. These modes of collapse have been conformed by many investigators [1,4,10,[23][24][25][26].…”

Section: Effect Of Skin Hybridization On the Failure Behavior Of Sandmentioning

confidence: 73%

Failure Mechanism in Rigid PUF Sandwich Structures with Varied Skin Materials under Bending Load

Arun

Yadav

Chandradharappa

et al. 2009

Journal of Reinforced Plastics and Composites

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The results of the experimental analysis carried out on sandwich structures with rigid PUF core and different skin materials have been reported. The flammability tests have been carried out on core as well as the skin materials. From 3-point bending test FBS, CSS have been evaluated for the sandwich structures. These tests have been conducted on 4 different compositions of the core materials and 6 varieties of hybridized skin materials. Comparisons of results have been between the hybridized and non-hybridized sandwich structures. A macroscopic and microscopic analysis of the fractured surfaces have been made to identify the nature of failure under bending loads. It has been demonstrated that the debond strength of the core-face and core plays an important role in enhancing the flexural property and controlling of the failure mechanisms. It has been observed that with increasing the debonding strength of the core-face interface, the failure mode changes from debonding of the core-face interface to the failure of the face.

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Analytical determination of the ultimate strength of sandwich beams

Cited by 19 publications

References 6 publications

Numerical Study of Fractured Sandwich Composites under Flexural Loading

Numerical Study of Fractured Sandwich Composites under Flexural Loading

Syntactic foam core metal matrix sandwich composite under bending conditions

Failure Mechanism in Rigid PUF Sandwich Structures with Varied Skin Materials under Bending Load

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