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Related Concept Videos

Unsymmetric Bending01:18

Unsymmetric Bending

419
Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from those in symmetrical bending, and are essential for designing structures to withstand different loading conditions. In unsymmetrical bending, the neutral axis—where stress is zero—does not necessarily align with the geometric axes of the cross-section. The...
419
General Case of Eccentric Axial Loading01:12

General Case of Eccentric Axial Loading

245
Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from symmetrical bending, which are essential for designing structures to withstand different loading conditions.
Consider a member subjected to equal and opposite forces that are applied along a line that does not coincide with the member's neutral axis. In unsymmetrical...
245
Bending of Members Made of Several Materials01:08

Bending of Members Made of Several Materials

253
In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each...
253
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

322
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
322
Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

275
Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
275
Plastic Deformations of Members with a Single Plane of Symmetry01:21

Plastic Deformations of Members with a Single Plane of Symmetry

121
When a structural member undergoes plastic deformation due to bending, it is crucial to understand the position of the neutral axis and the stress distribution. This member, characterized by a single plane of symmetry, exhibits a uniform stress distribution, with negative stress above the neutral axis and positive stress below. Notably, the neutral axis does not align with the centroid of the cross-section. This misalignment is typical in cases where the cross-section is not rectangular or...
121

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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
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Buckling versus unilateral constraint for a multistable metamaterial element.

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  • 1DICAM, University of Trento, via Mesiano 77, Trento 38123, Italy.

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Summary

Researchers designed a novel structural element for elastic multistable metamaterials. This element exhibits buckling at zero load, enabling unique dynamic behaviors and multistable characteristics like bistability or tetrastability.

Keywords:
bucklingmetamaterialsnonlinear motionunilateral constraintvibration control

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Physics

Background:

  • Metamaterials offer unique mechanical properties through engineered structures.
  • Multistability in materials allows for multiple stable states, useful in tunable devices.
  • Understanding structural buckling is key to designing advanced materials.

Purpose of the Study:

  • To design and investigate a structural element for elastic multistable metamaterials.
  • To explore the implications of buckling at null load on material dynamics.
  • To characterize the nonlinear quasi-static response and multistable nature of the designed structure.

Main Methods:

  • Design of a strut with bifurcation at vanishing tensile or compressive load.
  • Analysis of buckling at null load to establish mechanical equivalence with unilateral constraints.
  • Investigation of nonlinear quasi-static response to determine multistability.

Main Results:

  • The designed structural element enables the development of elastic multistable metamaterials.
  • Buckling at null load introduces dynamics akin to unilateral constraints, with potential for shocks.
  • The structure exhibits multistable behavior, specifically bistable or tetrastable configurations.

Conclusions:

  • The novel structural element is a foundational component for creating advanced elastic multistable metamaterials.
  • The unique buckling behavior at null load opens avenues for studying shock dynamics in engineered materials.
  • The demonstrated bistable and tetrastable characteristics highlight the potential for tunable mechanical responses.