Indentation of sandwiches using a plate model with variable kinematics and fixed degrees of freedom

Icardi, Ugo; Sola, Federico

doi:10.1016/j.tws.2014.10.002

Cited by 8 publications

(7 citation statements)

References 40 publications

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“…Instead the in-plane continuity of σzz and of its gradient should not be enforced when in-plane discontinuity occurs. A former application of the idea discussed in this section was presented in Icardi and Sola (2015) for studying bonded joints (suddenly changing lay-up). In that case, the material variation was allowed only in one direction.…”

Section: Variable Piecewise In-plane Representationmentioning

confidence: 99%

“…In that case, the material variation was allowed only in one direction. Therefore (28) constitute a generalization of Icardi and Sola (2015).…”

Section: Variable Piecewise In-plane Representationmentioning

confidence: 99%

“…In order to account for the core crushing mechanism, the technique developed by Icardi and Sola (2015) that accounts for the buckling of cell wall of honeycomb core is adopted.…”

Section: Core Crushing Simulationmentioning

confidence: 99%

“…In Icardi and Sola (2015), this technique was shown to provide accurate predictions for a variety of sample cases dealing with sandwich indentation whose experimental results are published in the literature.…”

Section: Core Crushing Simulationmentioning

confidence: 99%

“…Therefore, the variable, apparent elastic moduli of the core while it collapses/buckles under transverse compressive loading are computed apart once for all through a detailed three-dimensional finite element analysis and provided to the VK-ZZ as variable properties at each load level, like in Icardi and Sola (2015).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Variable Piecewise In-plane Representationmentioning

confidence: 99%

“…In that case, the material variation was allowed only in one direction. Therefore (28) constitute a generalization of Icardi and Sola (2015).…”

Section: Variable Piecewise In-plane Representationmentioning

confidence: 99%

“…In order to account for the core crushing mechanism, the technique developed by Icardi and Sola (2015) that accounts for the buckling of cell wall of honeycomb core is adopted.…”

Section: Core Crushing Simulationmentioning

confidence: 99%

Section: Core Crushing Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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