Effect of skin treatment and core material on the bending behaviour of sandwich beams

Bakos, D; Papanicolaou, George

doi:10.1016/0266-3538(93)90019-d

Cited by 13 publications

(4 citation statements)

References 12 publications

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“…They concluded that for hard foam cores debonding is restricted to the interface between the facing material and the core, while for soft foam cores it can deflect and propagate into soft core material. Bakos and Papanicoloau [15] studied the bending behavior of sandwich beams with a glass fiber reinforced polymer core. Four different types of skin elements were used in their study.…”

Section: Introductionmentioning

confidence: 99%

Design of New Hybrid Composites using Metal Embedded in Polymer Foam and Foam Composite

Ahmed

Fahim

Naguib

2009

Journal of Composite Materials

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Adhesion and loading bearing properties of polyurethane (PU) foams and sandwich composite with metallic inserts are studied. Metal or solid polymer anchors are used as the load transfer components for PU foam and sandwich composites when they are used as the structural element in design. The traditional method of fixation of these components in foams is gluing and fastening. In this work, the anchors are in the form of inserts and are imbedded in the PU during the foaming process. Flexural testing was conducted on PU with and without metallic inserts to establish typical interaction trends. The load-deflection response, mode of failure, and fracture stresses of the PU structures are elucidated. Results show that long taper and leaf inserts imbedded in foam and sandwich composite provide better load carrying capacity. Comparisons between the taper and leaf inserts are documented. Leaf inserts inside a foam and sandwich composite show better results as compared to taper inserts in terms of adhesion and failure stresses. A linear elastic fracture model is also developed for the foam beam, and the fracture toughness is calculated. FEA analyses of the interaction between the inserts and the PU and sandwich composites under different loads were carried out. The FEA modeling results coincide with the experimental ones, hence validating the model.

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Section: Introductionmentioning

confidence: 99%

Design of New Hybrid Composites using Metal Embedded in Polymer Foam and Foam Composite

Ahmed

Fahim

Naguib

2009

Journal of Composite Materials

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“…Frostig and Baruch [6] analyzed deformation of a sandwich beam with flexible core under the various types of loading and boundary conditions using an analytical method. Bakos and Papanicolaou [7] analytically and experimentally investigated the effect of skin treatment on the bending behavior of a sandwich beam with glass/polyester. Cui and Wisnom [8] included contact between the surface of loading roller and specimen face to model the three-and four-point short-beam bending tests using the contact element in ABAQUS.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Flexural Deflection of Thermoplastic Foam Core Sandwich Beam

Yoon

Kim²,

Park

2002

Journal of Composite Materials

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Nonlinear flexural deflection behavior of foam core sandwich beams hasbeen experimentally investigated. The experimental data were compared with the predicted results obtained from a proposed analytical method and the finite element analysis. Sandwich beams with thermoplastic foam core and carbon/epoxy fabric faces were manufactured using the vacuum bagging process. To investigate the effect of the face thickness on the nonlinear flexural deflection, three types of specimens with different face thickness were prepared and tested using the four-point bending test method. Basic engineering data and nonlinear mechanical properties of the face sheet and the foam core were obtained from the tensile and shear tests. An analytical model wasproposed to predict the global nonlinear flexural deformation of the foam core sandwich beams. In the model, measured material nonlinear behavior of the foam core wasimplemented. The predicted global nonlinear deflection of the foam core sandwich beam using the proposed analytical model and the finite element analysis agreed well with the experimental data up to the local indentation failure point within some scattered range.

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“…One method to overcome this would be the use of a sandwich structure [17][18][19] in the tape cast substrates. This would increase substrate strength and flexural rigidity and accord good dimensional stability, corrosion resistance, and improved fatigue properties to the substrate.…”

Section: Introductionmentioning

confidence: 99%

Properties of Porous AlN Multilayered Ceramic Sandwich Substrates

et al. 2002

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The development of denser and higher powered integrated circuits has led to a corresponding demand on the performance of dielectric substrates. This paper reports on the fabrication and properties of an AlN multilayered sandwich substrate comprising porous tape-cast layers sandwiched between nonporous layers. Tapes were produced by nonaqueous tape casting, with the porous tapes produced using polymer microspheres as sacrificial molds. Starting from initially Al 2 O 3 -rich tapes, the multilayered sandwich substrates were reaction sintered to produce AlN substrates. No interface cracking or delamination was observed in the substrates as a result of the processing. The added porosity resulted in a decrease in the substrate dielectric constant in correspondence to porosity volume. Mechanical strength of the sandwich substrates was improved over that of nonsandwich porous substrates, while substrates having noninterconnected pores showing higher mechanical strength than substrates with connected pores. Substrates with more than 2% porosity showed porosity-dependent thermal conductivity values, while thermal conductivity of substrates with less than 2% porosity was dependent on grain boundary effects. Thermal expansion coefficient of the substrates was unaffected by porosity levels.

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Effect of skin treatment and core material on the bending behaviour of sandwich beams

Cited by 13 publications

References 12 publications

Design of New Hybrid Composites using Metal Embedded in Polymer Foam and Foam Composite

Design of New Hybrid Composites using Metal Embedded in Polymer Foam and Foam Composite

Nonlinear Flexural Deflection of Thermoplastic Foam Core Sandwich Beam

Properties of Porous AlN Multilayered Ceramic Sandwich Substrates

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