The influence of FRP inserts on the energy absorption of a foam-cored sandwich panel

Found, M.S.; Robinson, Alice M.; Carruthers, J. J.

doi:10.1016/s0263-8223(97)00072-x

Cited by 19 publications

(18 citation statements)

References 5 publications

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“…where w is the displacement at mid-span (measured at the surface opposite to the loading pin to avoid errors due to indentation [12]), P is the applied load per unit width, L is the span between the supports and DQ is the shear stiffness. Fig.…”

Section: Experimental Validation Of the Analytical-numerical Modelmentioning

confidence: 99%

“…Corrugated-core sandwich concepts with various geometries (the most recurring being the trapezoidal and the sinusoidal shapes) have been proposed since the beginning of the last century [10]. Applications have been for many years limited to whole metallic or cardboard structures, and the extension to fully FRP solutions dates around the end of last century [11][12][13]. One reason for the special appeal of this class of sandwiches is the improved in-plane crashworthiness and out of plane impact resistance, mainly obtained by the more difficult skin-core debonding due to the generally stronger joining between the corrugated core and the skin faces [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Mechanical behavior of a sandwich with corrugated GRP core: numerical modeling and experimental validation

Tumino

Ingrassia

Nigrelli

et al. 2014

Frattura Ed Integrità Strutturale

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In this work the mechanical behaviour of a core reinforced composite sandwich structure is studied. The sandwich employs a Glass Reinforced Polymer (GRP) orthotropic material for both the two external skins and the inner core web. In particular, the core is designed in order to cooperate with the GRP skins in membrane and flexural properties by means of the addition of a corrugated laminate into the foam core. An analytical model has been developed to replace a unit cell of this structure with an orthotropic equivalent thick plate that reproduces the in plane and out of plane behaviour of the original geometry. Different validation procedures have been implemented to verify the quality of the proposed method. At first a comparison has been performed between the analytical model and the original unit cell modelled with a Finite Element mesh. Elementary loading conditions are reproduced and results are compared. Once the reliability of the analytical model was assessed, this homogenised model was implemented within the formulation of a shell finite element. The goal of this step is to simplify the FE analysis of complex structures made of corrugated core sandwiches; in fact, by using the homogenised element, the global response of a real structure can be investigated only with the discretization of its mid-surface. Advantages are mainly in terms of time to solution saving and CAD modelling simplification. Last step is then the comparison between this FE model and experiments made on sandwich beams and panels whose skins and corrugated cores are made of orthotropic cross-ply GRP laminates. Good agreement between experimental and numerical results confirms the validity of the proposed model

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Section: Experimental Validation Of the Analytical-numerical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanical behavior of a sandwich with corrugated GRP core: numerical modeling and experimental validation

Tumino

Ingrassia

Nigrelli

et al. 2014

Frattura Ed Integrità Strutturale

View full text Add to dashboard Cite

show abstract

“…These observations imply that each of the approaches can be used for the modeling of the behavior of the panel with the embedded inclusion. Hence, preferring one approach 1 In Approaches I and II, the definition of the internal stress resultants in the rigid insert are inherent in the mathematical formulation of the model. On the other hand, in Approach III the stress resultants are not explicitly defined in the model.…”

Section: Numerical Studymentioning

confidence: 99%

Soft-core Sandwich Panels with Embedded Rigid Inclusions

Rabinovitch

2007

Jnl of Sandwich Structures & Materials

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The structural response of sandwich panels hosting rigid inclusions (inserts) embedded in a soft core is analytically investigated. Three approaches for the mathematical modeling of the structural behavior of the sandwich panel hosting the rigid inclusion are formulated, examined, and compared. In the first approach, the rigid body displacement field of the inclusion is introduced through a unique constitutive law. The second approach uses a multilayered high-order model in which the rigid insert is modeled using significantly increased but finite mechanical properties. In the third approach, the embedded inclusion is considered infinitely rigid and the compatibility and interaction between the rigid insert and the adjacent structural components are imposed using Lagrange multipliers. In all the cases, the field equations and the boundary condition are derived using variational principles. The continuity conditions that connect between the region hosting the rigid insert and the adjacent ordinary sandwich regions are also derived using the variational principle. The mathematical models resulting from the first and second approaches take the form of a set of coupled differential equations. On the other hand, the third approach, which takes advantage of the rigid body displacement field of the embedded inclusion, yields a reduced order set of coupled differential-integral equations. An analytical procedure for the solution of this set of equations is derived. Numerical results that focus on the deformed shape of the panel under load, the distributions of the internal stress resultants, the shear and vertical normal stresses in the core, and the interaction between the rigid insert and the adjacent components are presented. The numerical results compare between the various modeling approaches, demonstrate their capabilities, and reveal some of the characteristics of such sandwich panels. A summary and conclusions closes the paper.

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“…Armor plates composed of ceramic tiles, rubber joints, and outer composite layers (Mahdi and Gillespie 2004), sandwich panels with embedded rigid inserts (Found et al 1997;Burchardt 1998;Thomsen and Rits 1998;Thomsen 1998;Mamalis et al 2002;Bozhevolnayaa et al 2004;Bozhevolnayaa and Lyckegaard 2005;Rabinovitch 2007), and coating for electronic packaging (Anderson et al 2009), are examples of such applications. Another example is found in masonry walls upgraded with externally bonded composite materials and fiber reinforced polymers (FRP).…”

Section: Introductionmentioning

confidence: 99%

Buckling-driven debonding in stiff block: compliant joint structural assemblies patched with composite materials

Rabinovitch

2010

Int J Fract

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The initiation, growth, and stability of buckling driven debonding in structural assemblies of stiff blocks, compliant joints, and adhesively bonded composite layers are analytically investigated. The model is developed with focus on masonry walls externally strengthened with composite materials where static and, mainly, dynamic loads may induce compression in the strengthening layers triggering a buckling driven debonding near the joints. The model introduces the interfacial nonlinearity (debonding) through a cohesive interface approach. The geometrical nonlinearity is introduced through the kinematics of intermediate class of deformation (large deflections, moderate rotations, small strains), and the material nonlinearity of the masonry construction is introduced through the constitutive law for the mortar joints. A numerical study of the debonding process in strengthened masonry walls is presented. The study uses the periodicity of the wall for sub-structuring and examines configurations that include composite strips or sheets, strengthening on one face of the wall or on both faces, and compliant mortar materials.

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The influence of FRP inserts on the energy absorption of a foam-cored sandwich panel

Cited by 19 publications

References 5 publications

Mechanical behavior of a sandwich with corrugated GRP core: numerical modeling and experimental validation

Mechanical behavior of a sandwich with corrugated GRP core: numerical modeling and experimental validation

Soft-core Sandwich Panels with Embedded Rigid Inclusions

Buckling-driven debonding in stiff block: compliant joint structural assemblies patched with composite materials

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