Failure Modes of Composite Sandwich Beams

Daniel, I. M.; Gdoutos, E. E.; Wang, K.–A.; Abot, Jandro L.

doi:10.1106/105678902027247

Cited by 169 publications

(80 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Core failure by shear is a common failure mode in sandwich construction [Allen 1969;Hall and Robson 1984;Zenkert and Vikström 1992;Zenkert 1995;Daniel et al 2001a;2001b;Sha et al 2006]. In short beams under three-point bending the core is mainly subjected to shear, and failure occurs when the maximum shear stress reaches the critical value (shear strength) of the core material.…”

Section: Core Failuresmentioning

confidence: 99%

“…For a sandwich beam of rectangular cross section, with facesheets and core materials displaying linear elastic behavior, subjected to a bending moment, M, and shear force, V , the in-plane maximum normal stress, σ , and shear stress, τ , in the core, for a low stiffness core and thin facesheets are given by [Daniel et al 2001a]…”

Section: Core Failuresmentioning

confidence: 99%

“…Following initiation of a particular failure mode, this mode may trigger and interact with other modes and final failure may follow a different failure path. A general review of failure modes in composite sandwich beams was given in [Daniel et al 2002]. Individual failure modes in sandwich columns and beams are discussed in Gdoutos et al 2002b;.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of core properties on the failure of composite sandwich beams

Daniel¹

2009

J. Mech. Solids Struct.

View full text Add to dashboard Cite

The initiation of failure in composite sandwich beams is heavily dependent on properties of the core material. Several core materials, including PVC foams and balsa wood were characterized. The various failure modes occurring in composite sandwich beams are described and their relationship to the relevant core properties is explained and discussed. Under flexural loading of sandwich beams, plastic yielding or cracking of the core occurs when the critical yield stress or strength (usually shear) of the core is reached. Indentation under localized loading depends principally on the square root of the core yield stress. The critical stress for facesheet wrinkling is related to the core Young's and shear moduli in the thickness direction. Experimental mechanics methods were used to illustrate the failure modes and verify analytical predictions.

show abstract

Section: Core Failuresmentioning

confidence: 99%

Section: Core Failuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of core properties on the failure of composite sandwich beams

Daniel¹

2009

J. Mech. Solids Struct.

View full text Add to dashboard Cite

show abstract

“…The shear stress, τ, is constant along the beam span and through the core thickness, as verified experimentally [2].…”

Section: Theoretical Considerationsmentioning

confidence: 76%

“…An extensive amount of work has been performed at Northwestern University on the mechanical behaviour and failure of sandwich beams under four-and three-point bending and cantilever beams made of unidirectional carbon/epoxy (AS4/3501-6) facings and a PVC closed-cell foam (Divinycell) cores [1][2][3][4][5][6][7]. The load-deflection behaviour of these materials consists of an initial linear portion followed by a nonlinear part.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Stress and Deformation Behaviour of Composite Sandwich Beams

Gdoutos

Daniel²

2008

AMM

View full text Add to dashboard Cite

Abstract. The nonlinear load-displacement and normal stress distribution in composite sandwich beams made of unidirectional carbon/epoxy facings and PVC foam cores under bending was studied. The carbon/epoxy after an initial linear response exhibits a stiffening nonlinearity in tension and a softening nonlinearity in compression with the longitudinal strength in tension higher than that in compression. The foam core also presents a nonlinear stress-strain response. It was obtained that the load-displacement behaviour of the beam, after an initial linear part, is not linear. This behavior was modeled by an incremental strength of materials nonlinear analysis. The theoretical predictions were in good agreement with the experimental results. Furthermore, it was obtained that the neutral axis of sandwich beams under bending does not pass through the centroid of the cross section, but is displaced toward the tensile side of the beam. Experimental results by moiré measurements of the in-plane horizontal displacements of the core material corroborated the analytical predictions. These findings imply higher compressive and smaller tensile stresses in the core, than those predicted for facings with identical stress-strain behaviour in tension and compression, and should be taking into consideration in the failure analysis of sandwich beams.

show abstract

Processing, mechanical properties, and interfacial bonding of a thermoplastic core‐foam/composite‐skin sandwich panel

Pappadà¹,

Rametta²,

Passaro³

et al. 2010

Adv Polym Technol

View full text Add to dashboard Cite

ABSTRACT:In this work, a thermoplastic sandwich panel was designed, produced, and tested for use in insulating walls of containers for food transportation. A sandwich construction comprising a poly(ethylene terephthalate) core and polypropylene/glass fiber skins was evaluated as possible replacement of systems consisting of polyurethane foam in combination with unsaturated polyester glass-reinforced skins that are currently used for the manufacture of these structures. Factors were taken into account to satisfy the simultaneous need of thermal insulation and adequate mechanical properties that are required for the production of large flat panels 100-mm thick. The influences of different manufacturing processes and skin-core adhesion on the mechanical properties of this thermoplastic sandwich were investigated and are discussed in This paper was presented at the conference ICCM-17 on Thermoplastic Matrix Composites.

show abstract

Failure Modes of Composite Sandwich Beams

Cited by 169 publications

References 22 publications

Influence of core properties on the failure of composite sandwich beams

Influence of core properties on the failure of composite sandwich beams

Nonlinear Stress and Deformation Behaviour of Composite Sandwich Beams

Processing, mechanical properties, and interfacial bonding of a thermoplastic core‐foam/composite‐skin sandwich panel

Contact Info

Product

Resources

About