Full scale analysis of FRP strengthened plates with irregular layouts

Feldfogel, Shai; Rabinovitch, Oded

doi:10.1016/j.ijmecsci.2016.04.012

Cited by 11 publications

(6 citation statements)

References 21 publications

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“…[33] are used. Their implementation in the context of a multilayered plate theory—which includes high-order displacement fields in the middle layer, generally orthotropic layers, and geometrical nonlinearity is detailed in Feldfogel and Rabinovitch [21,22].…”

Section: Formulationmentioning

confidence: 99%

“…Attempting to overcome the geometrical limitations of the rectangular elements, Feldfogel and Rabinovitch [21–25] developed a multilayered plate theory and a corresponding triangular finite element. The formulation in [21,22] assumed flexible elastic interfaces and it was used for the static analysis of FRP-strengthened plates. The flexible interfaces allow a natural starting point to modify the interface modeling from bonded interfaces to debonding cohesive interfaces, towards the study of interfacial debonding analysis of adhesively bonded layered plates.…”

Section: Introductionmentioning

confidence: 99%

“…Szekrenyes [27] showed that including transverse stretching also improves the assessment of the energy release rate, compared with the first-order model. While taking into account the intermediate soft layer’s deformability, including the transverse stretching, Feldfogel and Rabinovitch [21–25] are limited to the static regime. As such, they are not equipped to handle the dynamic behavior of soft-core sandwich plates in general, and particularly under blast loading.…”

Section: Introductionmentioning

confidence: 99%

“…Barut et al. [29] developed an RZT plate model based on a cubic through-the-thickness distribution of the in-plane displacements and a parabolic one for the transverse normal deflections, kinematic assumptions that were later made in Feldfogel and Rabinovitch [21–25]. A simply supported sandwich plate was solved using a trigonometric series expansion, and it showed good agreement with Pagano’s classical solution.…”

Section: Introductionmentioning

confidence: 99%

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Soft-core sandwich plate dynamics: Theory and blast analysis

Feldfogel

Rabinovitch

2019

Jnl of Sandwich Structures & Materials

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This work presents an analytical and computational platform that aims to face the modeling, analytical, and computational challenges associated with highly transient dynamics of soft-core sandwich plates and shed light on the dynamic behavior of this unique structural form. This platform comprises a dynamic tri-layered plate analytical model and a corresponding specially tailored triangular finite element formulation. The model is based on extended high-order kinematics for the soft core layer, and it accounts for geometrical nonlinearity, high-order inertia terms, material orthotropy in the three physical layers, the presence of interfaces linking those layers, the interfacial tractions that develop across them, and the bi-directional dynamic response of the plate structure. The governing equations of the finite element formulation are solved in the time domain using a nonlinear Newmark-type time-stepping algorithm. The methodology is validated with regard to free vibration analysis and forced motion analysis against experimental results, 2D-, and 3D-elasticity-based closed form solutions, and multilayered plate finite elements reported in the literature. Following the validation, a numerical example considers the transient response of a soft-core sandwich plate subjected to highly transient air blast loading and compares the response with experimental results taken from the literature. The study examines the ability of present formulations to capture the experimentally observed response and to shed light on some aspects of the response, including the inherently 2D nature of the response, the propagation of stress fronts through the structural medium, and the interfacial interactions.

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Section: Formulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Soft-core sandwich plate dynamics: Theory and blast analysis

Feldfogel

Rabinovitch

2019

Jnl of Sandwich Structures & Materials

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“…For all the models, Timoshenko's composite beam functions are adopted for describing the transversal and rotational behavior without occurring in shear-locking problems. A similar approach has been followed by Feldfogel and Rabinovitch, 36 where a new multilayered plate element based on the Constant Strain Triangle (CST) is presented. The advantage of this model with respect to rectangular-shaped elements is the possibility to deal with irregular layouts as often happens in retrofitting applications by means of FRP.…”

Section: Introductionmentioning

confidence: 99%

Enhanced finite element formulation incorporating stress jumps and interface behavior in structures with embedded linear inclusions

Riccardi

Giry

Gatuingt

2020

Numerical Meth Engineering

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When linear inclusions are embedded into a matrix, a perturbation is introduced in the boundary value problem written at the macroscale. Such inhomogeneity can provoke sharp gradients in the solution and a correct evaluation of the interface stress state reveals necessary when localized material degradations can lead to global failure mechanisms. In order to account for such refined description in large‐scale structural problems, a novel enhanced implicit finite element formulation is presented. The standard displacement approximation is improved by means of a kinematic enrichment aimed at reproducing the local interaction between the matrix and the inclusion. The microscale interface behavior can then be directly evaluated from the stress jump arising in the bulk. From a computational point of view, this translates in solving an additional local equilibrium equation. The static boundary conditions at the inclusion ends are thus exactly verified and a good precision is achieved with minimal meshing effort and code modifications. The proposed model is applied to elementary and structural examples involving singularities and it is compared to other modeling strategies with focus both on global and local quantities as well on the convergence properties and corresponding CPU times of the approximated solution.

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Crack induced interfacial debonding in damaged RC slabs strengthened with FRP

Feldfogel

Rabinovitch

2018

Int J Fract

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Full scale analysis of FRP strengthened plates with irregular layouts

Cited by 11 publications

References 21 publications

Soft-core sandwich plate dynamics: Theory and blast analysis

Soft-core sandwich plate dynamics: Theory and blast analysis

Enhanced finite element formulation incorporating stress jumps and interface behavior in structures with embedded linear inclusions

Crack induced interfacial debonding in damaged RC slabs strengthened with FRP

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