A new FE model based on higher order zigzag theory for the analysis of laminated sandwich beam with soft core

Chakrabarti, Anupam; Chalak, H. D.; Iqbal, M.A.; Sheikh, Abdul Hamid

doi:10.1016/j.compstruct.2010.08.031

Cited by 66 publications

(56 citation statements)

References 35 publications

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“…Frostig [15], Plagianakos and Saravanos [16], Zhen and Wanji [17], Elmalich and Rabinovitch [18] and Giunta et al [19]). An extensive discussion of the techniques used by these models to account for the layerwise effects, extensive assessments of their structural performances and of related finite element models are given among many others in the recent papers by Matsunaga [20] and Chakrabarti et al [21]. The crucial point is whether HLW models have a number of unknowns that depends or not on the number of physical or computational layers, as this determines accuracy and computational costs.…”

Section: Introductionmentioning

confidence: 99%

Indentation of Sandwiches Using a Refined Zig-Zag Model and a Mesoscale Damage Model

Icardi¹,

Sola²

2014

ujme

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An accurate and cost effective zig-zag plate model with variable kinematics and fixed degrees of freedom recently developed by the authors, which a priori fulfills the stress and displacement continuity requirements, is applied to study indentation of sandwiches with honeycomb/foam core. The variable elastic properties of the core during crushing are evaluated apart and once at a time through a 3D finite element analysis. Shell elements with elastic-plastic isotropic properties are adopted to discretize honeycomb cores and faces, instead solid elements with nonlinear material behavior are used for foam cores. To keep low the computational burden, the structural response is computed in closed form by the zig-zag model using these elastic properties. The damage analysis is carried out through a mesoscale model that determines the degraded properties of failed regions in a physically consistent way. A good agreement with experiments taken from the literature being shown, the present simulation procedure with a low computational effort is proven to be an efficient alternative to the ones currently employed.

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Section: Introductionmentioning

confidence: 99%

Indentation of Sandwiches Using a Refined Zig-Zag Model and a Mesoscale Damage Model

Icardi¹,

Sola²

2014

ujme

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“…In this paper an attempt is made to do the stability analysis of laminated sandwich beam having soft compressible core based on higher order zigzag theory by using a C 0 beam finite element model recently developed by the authors [1]. The model satisfies the transverse shear stress continuity conditions at the layer interfaces and the conditions of zero transverse shear stress at the top and bottom of the beam.…”

Section: Introductionmentioning

confidence: 99%

Buckling analysis of laminated sandwich beam with soft core

Chakrabarti

Chalak

Iqbal

et al. 2012

Lat. Am. j. solids struct.

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Stability analysis of laminated soft core sandwich beam has been studied by a C0 FE model developed by the authors based on higher order zigzag theory (HOZT). The in-plane displacement variation is considered to be cubic for the face sheets and the core, while transverse displacement is quadratic within the core and constant in the faces beyond the core. The proposed model satisfies the condition of stress continuity at the layer interfaces and the zero stress condition at the top and bottom of the beam for transverse shear. Numerical examples are presented to illustrate the accuracy of the present model.

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“…An extensive discussion of structural models used in the simulations and extensive assessments of their performances are given by Chakrabarti et al (2011), Chen and Wu (2008), Kreja (2001), Zhang and Yang (2009), Tahani (2007) and Matsunaga (2004).…”

Section: Introductionmentioning

confidence: 99%

Impact Damage Analysis with Stress Continuity Constraints Fulfilment at Damaged-Undamaged Regions and at Layer Interfaces

Icardi

Urraci

2017

Lat. Am. j. solids struct.

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Low-velocity impacts have a relevant importance for safety of laminated and sandwich composite structures, because they are highly susceptible to damage. In this paper, a 3D cost effective zig-zag model is developed in order to efficiently simulate such impacts. It a priori fulfills the continuity of out-of-plane stresses at layer interfaces, the continuity of stresses under in-plane variation of properties across undamaged and damaged regions and it is suitable for general boundary conditions. Its main advantage is its capability to accurately predict stresses from constitutive equations at a low cost, along with being refined across the thickness keeping fixed the number of unknowns. A modified Hertzian contact law that forces the target to conform to the shape of the impactor and the Newmark's implicit time integration scheme are used for computing the contact force time history. The progressive damage analysis is carried out using stress-based criteria. Non-classical feature, a continuum damage mesomechanic model is employed that accounts for the effects of local failures in homogenized form by modifying the strain energy expression. Fiber, matrix and delamination failures are predicted using stress-based criteria, and then the modified strain energy expression is employed for computing stresses. Such modeling options enable to account for the residual properties as they are in the reality, as shown by the comparison with the damage experimentally detected. As shown by the comparison with experiments, a closed-form solution by the Galerkin's method, obtained as a series expansion of trial displacement functions, accurately simulates the contact force and the damage progressively accumulated. The results show the importance of in-plane stress continuity for obtaining accurate predictions.Keywords Impact-induced damage; 3D variable-kinematics zig-zag model; undamaged/damaged stress continuity; interlayer stress continuity; fixed d.o.f; mesomechanic damage model.

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A new FE model based on higher order zigzag theory for the analysis of laminated sandwich beam with soft core

Cited by 66 publications

References 35 publications

Indentation of Sandwiches Using a Refined Zig-Zag Model and a Mesoscale Damage Model

Indentation of Sandwiches Using a Refined Zig-Zag Model and a Mesoscale Damage Model

Buckling analysis of laminated sandwich beam with soft core

Impact Damage Analysis with Stress Continuity Constraints Fulfilment at Damaged-Undamaged Regions and at Layer Interfaces

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