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Related Concept Videos

Plastic Deformations01:19

Plastic Deformations

281
Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
281
Plastic Deformations01:14

Plastic Deformations

266
It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
266
Castigliano's Theorem01:18

Castigliano's Theorem

733
Castigliano's theorem analyzes displacements and rotations in elastic structures. It relates the derivative of elastic strain energy to the applied forces or moments, allowing for the calculation of deformations. The theorem states that the partial derivative of the total strain energy of a system with respect to a specific load results in the displacement at the point where the load is applied. This principle applies to both forces and moments.
733
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

365
As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
365
Residual Stresses01:26

Residual Stresses

406
Residual stresses reside in a structure even after removing the original stress inducer. This phenomenon often arises from varied plastic deformations across different parts of a structure. Consider a rod stretched beyond its yield point. It will not regain its original length due to permanent deformation. Even after load removal, the rod does not entirely lose stress because of uneven plastic deformations, resulting in residual stresses. The computation of these stresses in structures is...
406
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

275
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
275

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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
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Tensegrity Metamaterials: Toward Failure-Resistant Engineering Systems through Delocalized Deformation.

Jens Bauer1, Julie A Kraus2, Cameron Crook3

  • 1Mechanical and Aerospace Engineering Department, University of California, Irvine, Irvine, CA, 92697, USA.

Advanced Materials (Deerfield Beach, Fla.)
|February 5, 2021
PubMed
Summary

Researchers introduce delocalized deformation using tensegrity metamaterials to create failure-resistant structures. This approach enhances deformability by 25-fold and energy absorption, advancing lightweight material design.

Keywords:
delocalized deformationenergy absorptionfailure resistancemetamaterialtensegrity

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Area of Science:

  • Materials Science
  • Structural Engineering
  • Metamaterials

Background:

  • Material failure often stems from localized deformation mechanisms like shear banding and crack propagation.
  • Lightweight structures face catastrophic failure in localized deformation, restricting their use to small strain ranges.
  • Current robust designs rely on overengineered linear-elastic constructions for nonlinear loading.

Purpose of the Study:

  • Introduce the concept of delocalized deformation as a strategy for failure-resistant materials and structures.
  • Present space-tileable tensegrity metamaterials designed for delocalized deformation.
  • Demonstrate enhanced failure resistance and energy absorption capabilities.

Main Methods:

  • Design and fabrication of space-tileable tensegrity metamaterials.
  • Utilizing discontinuity in compression members to achieve delocalized deformation.
  • Comparative analysis of failure resistance and energy absorption against state-of-the-art lattice architectures.

Main Results:

  • Tensegrity metamaterials exhibit delocalized deformation through discontinuous compression members.
  • Achieved up to a 25-fold enhancement in deformability.
  • Demonstrated orders of magnitude increase in energy absorption capability without failure compared to lattice structures.

Conclusions:

  • Delocalized deformation via tensegrity metamaterials offers unprecedented failure resistance.
  • This approach significantly improves deformability and energy absorption.
  • Provides a foundation for designing advanced engineering systems like impact protection and adaptive structures.