Failure of cellular foams under multiaxial loading

Gdoutos, E. E.; Daniel, I. M.; Wang, K.-A

doi:10.1016/s1359-835x(01)00110-5

Cited by 112 publications

(88 citation statements)

References 10 publications

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“…In this case, the core in the beam is subjected to a biaxial state of stress and fails according to an appropriate failure criterion. It was shown earlier that failure of the PVC foam core Divinycell H250 can be described by the Tsai-Wu failure criterion [Gdoutos et al 2002a;Bezazi et al 2007].…”

Section: Core Failuresmentioning

confidence: 98%

“…Beam specimens 25.4 mm wide and of various lengths were cut from the sandwich plates. Two core materials, Divinycell H100 and H250 were fully characterized under multiaxial stress conditions [Gdoutos et al 2002a]. A series of biaxial tests were conducted including constrained strip specimens in tension and compression with the strip axis along the through-thickness and in-plane directions; constrained thin-wall ring specimens in compression and torsion; thin-wall tube specimens in tension and torsion; and thin-wall tube specimens under axial tension, torsion and internal pressure.…”

Section: Characterization Of Core Materialsmentioning

confidence: 99%

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Influence of core properties on the failure of composite sandwich beams

Daniel¹

2009

J. Mech. Solids Struct.

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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.

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Section: Core Failuresmentioning

confidence: 98%

Section: Characterization Of Core Materialsmentioning

confidence: 99%

Influence of core properties on the failure of composite sandwich beams

Daniel¹

2009

J. Mech. Solids Struct.

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“…55). The stresses at tension σ + corresponds to the data provided by the manufacturer [52] and indirectly to the measurements by Gdoutos for the PVC-foam H 250 [72]. The stresses at compression σ − are significantly lower compared to the data in [52,72].…”

Section: Measurements Of Cristensen For Pvc Hard Foammentioning

confidence: 77%

Phenomenological Yield and Failure Criteria

Altenbach

Bolchoun

Kolupaev

2013

Plasticity of Pressure-Sensitive Materials

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Models for isotropic materials based on the equivalent stress concept are discussed. At first, so-called classical models which are useful in the case of absolutely brittle or ideal ductile materials are presented. Tests for basic stress states are suggested. At second, standard models describing the intermediate range between the absolutely brittle and ideal-ductile behavior are introduced. Any criterion is expressed by various mathematical equations formulated, for example, in terms of invariants. At the same time the criteria can be visualized which simplifies the application. At third, in the main part pressure-insensitive, pressure-sensitive and combined models are separated. Fitting methods based on mathematical, physical and geometrical criteria are necessary. Finally, three examples (gray cast iron, poly(oxymethylene) (POM) and poly(vinyl chloride) (PVC) hard foam) demonstrates the application of different approaches in modeling certain limit behavior. Two appendices are necessary for a better understanding of this chapter: in Chap. 2 applied invariants are briefly introduced and a table of discussed in this chapter criteria with references is given.

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“…The aluminum honeycomb material is highly anisotropic with much higher stiffness and strength in the throughthe-thickness direction (cell direction) than in the in-plane directions. For the characterization of the core material properties refer to [9,10]. …”

Section: Applied Mechanics and Materials Vols 13-14 93mentioning

confidence: 99%

Nonlinear Stress and Deformation Behaviour of Composite Sandwich Beams

Gdoutos

Daniel²

2008

AMM

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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.

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Failure of cellular foams under multiaxial loading

Cited by 112 publications

References 10 publications

Influence of core properties on the failure of composite sandwich beams

Influence of core properties on the failure of composite sandwich beams

Phenomenological Yield and Failure Criteria

Nonlinear Stress and Deformation Behaviour of Composite Sandwich Beams

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