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Mechanics of Thin-Walled Structures and Other Lightweight Constructions

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Construction and Building Materials".

Deadline for manuscript submissions: 20 February 2025 | Viewed by 1306

Special Issue Editor


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Guest Editor
Department of Aerospace Engineering, Technion, Israel Institute of Technology, Haifa 32000, Israel
Interests: stability of thin-walled structures; static and dynamic behavior of thin-walled structures; smart structures; piezoelectric materials; shape memory materials
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Special Issue Information

Dear Colleagues,

The topic for this Special Issue is “Mechanics of Thin-Walled Structures and Other Lightweight Constructions.” Thin-walled and lightweight structures must provide operational demands and safety within a minimal weight. Typical structures would be made of thin load skins’ frames, stiffeners, and spars, all made of high strength and stiffness materials to comply with the desired minimal weight criteria. Although the topic was extensively presented in the literature, new and innovative studies on non-linear behavior as compared to their linear behavior started to be more and more present.

The present Special Issue aims to provide a new platform for recent studies on the structural behavior of thin-walled and lightweight structures in their linear and non-linear regimes.

These studies can present those structures' static and dynamic behavior, highlighting new numerical methods, finite element solutions, and experimental results.

Prof. Dr. Haim Abramovich
Guest Editor

Manuscript Submission Information

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Keywords

  • thin-wall structures
  • lightweight construction
  • sandwich panels
  • fiber-reinforced polymer composite
  • beams
  • plates
  • panels
  • numerical analysis
  • experiments
  • displacements
  • stresses
  • boundary conditions
  • linear behavior
  • non-linear behavior

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Published Papers (2 papers)

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Research

26 pages, 5898 KiB  
Article
Evaluation of the Influence of Bolt Fastener Spacing on the Elastic Critical Load from the Lateral-Torsional Buckling Condition of Built-Up Bending Members
by Rafał Piotrowski and Andrzej Szychowski
Materials 2024, 17(14), 3392; https://doi.org/10.3390/ma17143392 - 9 Jul 2024
Viewed by 439
Abstract
In an experimental study of two-branched beams bent transversely about the major stiffness axis, the elastic critical load from the lateral-torsional buckling condition was determined. The tests were conducted on simply supported two-branch beam models with a built-up section consisting of two cold-formed [...] Read more.
In an experimental study of two-branched beams bent transversely about the major stiffness axis, the elastic critical load from the lateral-torsional buckling condition was determined. The tests were conducted on simply supported two-branch beam models with a built-up section consisting of two cold-formed channel members (2C) bolted back-to-back. The bolts were located at the mid-height of the built-up cross-section. Five groups of members differing in longitudinal bolt spacing were examined. The models were gravitationally loaded (using ballast) at the centre of the beam span. This approach eliminated the undesirable effect of the lateral support of the beam, e.g., by the actuator head. The critical load, measured by the concentrated transverse force (Pz,cr), was determined using the modified Southwell method. It has been experimentally shown that, in built-up beams, there is an influence of bolt spacing on the elastic critical load from the lateral-torsional buckling condition. The lowest critical load capacity and the most non-linear behaviour of the built-up member were observed in beams bolted with only three bolts (at the supports and in the middle of the span). However, the experimental results obtained in this study show that increasing the number of bolts above a certain level (in the case of the tested models, it was seven bolts) does not result in a further increase in the critical load, which is a surprising result. The obtained values were 15 to 23% lower than the critical load determined numerically by the finite element method (LTBeamN) for an analogous element with a uniform I-section. Full article
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15 pages, 7496 KiB  
Article
The Behavior of Long Thin Rectangular Plates under Normal Pressure—A Thorough Investigation
by Gilad Hakim and Haim Abramovich
Materials 2024, 17(12), 2902; https://doi.org/10.3390/ma17122902 - 13 Jun 2024
Viewed by 502
Abstract
Thin rectangular plates are considered basic structures in various sectors like aerospace, civil, and mechanical engineering. Moreover, isotropic and laminated composite plates subjected to transverse normal loading and undergoing small and large deflections have been extensively studied and published in the literature. Yet, [...] Read more.
Thin rectangular plates are considered basic structures in various sectors like aerospace, civil, and mechanical engineering. Moreover, isotropic and laminated composite plates subjected to transverse normal loading and undergoing small and large deflections have been extensively studied and published in the literature. Yet, it seems that the particular case of long thin plates having a high aspect ratio appears to be almost ignored by various scholars despite its engineering importance. The present study tries to fill this gap, yielding novel findings regarding the structural behavior of long thin plates in the small- and large-deflection regimes. In contrast to what is normally assumed in the literature, namely that a long plate with a high aspect ratio can be considered an infinitely long plate, the present results clearly show that the structural effects of the ends continue to exist near the remote ends of the long plate. An innovative finding is that long plates would (only on movable boundary conditions for the large-deflection regime) exhibit a larger mid-width displacement in comparison with deflections of infinitely long plates. This innovative higher deflection appears for both small and large-deflection regimes for both all-around simply supported and all-around clamped boundary conditions. This new finding was shown to be valid for both isotropic and orthotropic materials and presents a novel engineering approach for the old assumption well quoted in the literature that a relatively long plate on any boundary condition can be considered an infinite plate. Based on the present research, it is recommended that this assumption should be used carefully as the largest plate mid-deflection might occur at finite aspect ratios. Full article
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: ENRICHED DEFORMATION MODELS IN-PLANE AND OUT-OF-PLANE OF THE GEOMETRICALLY NONLINEAR SOLID-LIKE THIN-WALLED BEAMS
Authors: Kzam* , A. K. L.; Coda, H. B
Affiliation: Universidade Federal da Integração Latino-Americana
Abstract: The paper presents an original geometrically nonlinear formulation considering the improvements of cross-section buckling deformation to tridimensional model of thin-walled bars. The finite element kinematic is based on full Lagrangian descriptions undergoing large displacements and rotations. Both in-plane and out-of-plane cross-section deformation are included. Unconstrained vector, positions and cross-section buckling deformation are used as nodal parameters for a solid-like finite element. These parameters are called GDOF’s (Generalized Degrees of Freedom) and represent the intensity of energetic-conjugated forces derived from stationary energy principle. GDOF’s are an alternative to the linear buckling modes. Applying GDOF formulation is possible to consider a nonlinear cross-section buckling deformation and post-buckling analysis. General illustrative numerical examples are solved to demonstrate the accuracy of the proposed formulation.

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