Comparison and experimental verification of simplified one-dimensional linear elastic models of multilayer sandwich beams

Szeptyński, Paweł

doi:10.1016/j.compstruct.2020.112088

Cited by 12 publications

(11 citation statements)

References 20 publications

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“…This approach provides options of a wide variety of mechanical characteristics without making a substantial control effort from the viewpoint of the embodied intelligence. [57] Further investigations in modeling [58] and experimental characterization will be useful since the anisotropic structures made of different materials may include complicated interactions between the internal components. For example, the double-layered face sheet structure can be examined for the interactions between the stacked face sheets and the core.…”

Section: Discussionmentioning

confidence: 99%

Selectively Stiffening Garments Enabled by Cellular Composites

Kwon

Choi

Park

et al. 2022

Adv Materials Technologies

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Recent efforts on wearable robots have focused on augmenting the motor performance and/or protecting the wearer's body with lightweight structures. However, providing human‐scale force and structural stiffness usually conflicts with the wearability. Inspired by sandwich‐structured composites with high structural strengths, widely employed in both nature and man‐made structures, a mechanism of selectively stiffening garments (SSGs) utilizing anisotropic cellular cores and rubber‐laminated face sheets is proposed. While the proposed mechanism shows a high compliance allowing for conformity to the wearer's body when unjammed, it provides a significantly high force density when jammed, compared to conventional jamming methods, allowing for the ability to adjust mechanical properties based on the designs and materials. In this paper, various designs of the sandwich jamming structures for the SSGs with analytical characterizations and experimental validations are introduced. Potential applications for force and motion assistance are also demonstrated and impacted mitigation.

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Section: Discussionmentioning

confidence: 99%

Selectively Stiffening Garments Enabled by Cellular Composites

Kwon

Choi

Park

et al. 2022

Adv Materials Technologies

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“…Meanwhile, the damping values are required for the dynamic numerical analysis of repaired/strengthened structures, where appropriate damping properties of component materials are sought. Moreover, elastomeric materials usually show nonlinear behaviour, described by hyper elastic theory [ 25 , 26 ], which does not include damping, thus this parameter must be determined experimentally.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, boundary conditions applied to the elastomeric layer, as well as the thickness of the layer, are of great importance. Moreover, to make analysis as simple as possible, polymeric adhesive layers can be combined in testing with materials of well-known and stable parameters, like aluminium [ 26 , 38 ] or glass [ 39 , 40 ]. Such composite structures can be easily tested, and parameters of elastomeric layers can be determined indirectly [ 41 ].…”

Section: Introductionmentioning

confidence: 99%

“…In the first stage, two aluminium cantilever beams (without and with polymer layer in the form of a tape) have been analysed. The second stage of the study focuses on five cantilever composite beams consisting of two aluminium flat bars bonded with polymer adhesive of different thickness (see also [ 26 , 38 ]). The specimens were forced to induce large deflections of the beams and thus large strain deformations of the polymer layers.…”

Section: Introductionmentioning

confidence: 99%

“…Dynamic parameters, such as modes of free vibrations, corresponding values of natural frequencies and damping ratios, were determined. Next, a detailed analysis, focused on the interpretation of the results, was carried out using the approaches described in [ 18 , 26 , 37 ]. Moreover, a new approach, separating the influence of equivalent stiffness and additional mass on damping of a polymeric layer, is also proposed.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Study on the Effectiveness of Polyurethane Flexible Adhesive in Reduction of Structural Vibrations

2020

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The aim of the present study is to consider the idea of using polyurethane flexible adhesive in to reduce the vibrations in structures exposed to dynamic loads and evaluate their damping properties in relation to large deformations. Firstly, two aluminium cantilever beams, simulating structural elements (without and with polyurethane layer in the form of tape), were analysed, in order to check the damping of the unconstrained polymer layer. In the second stage of the study, a composite beam consisting of two aluminium flat beams bonded with polymer adhesive was considered, so as to check the damping of the constrained polymer layer. Dynamic parameters, such as modes of free vibrations, corresponding natural frequencies and damping ratios, were determined and compared. The third stage of the investigation was aimed at solving the problem of the additional mass of the applied polymer layer, which influences the frequencies and damping of the tested structure. A special separating procedure is proposed that makes it possible to calculate the corrected real values of the polymer layer’s damping. The results of the study clearly show that the response of the composite aluminium beam with and without polymer adhesive layer is mainly influenced by the layers’ thickness and the large strain deformation, in terms of its damping characteristics. The use of polymer adhesive layers in constrained and unconstrained conditions leads to a significant reduction in the vibrations of tested beams, while preserving their stiffness at nearly the same level. The applied analysis procedure made it possible for us to separate the damping properties of the analysed polymer layers and evaluate them independently with respect to the influence of integrated structural elements on damping.

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Closed-form analytical solution to the problem of bending of a multilayer composite beam – Derivation and verification

Szeptyński

2022

Composite Structures

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Comparison and experimental verification of simplified one-dimensional linear elastic models of multilayer sandwich beams

Cited by 12 publications

References 20 publications

Selectively Stiffening Garments Enabled by Cellular Composites

Selectively Stiffening Garments Enabled by Cellular Composites

Experimental Study on the Effectiveness of Polyurethane Flexible Adhesive in Reduction of Structural Vibrations

Closed-form analytical solution to the problem of bending of a multilayer composite beam – Derivation and verification

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