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Related Concept Videos

Plastic Deformations01:19

Plastic Deformations

333
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...
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Plastic Deformations01:14

Plastic Deformations

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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...
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Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

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When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
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Temperature Dependent Deformation01:12

Temperature Dependent Deformation

298
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...
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Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

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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.
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Plastic Deformations of Members with a Single Plane of Symmetry01:21

Plastic Deformations of Members with a Single Plane of Symmetry

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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...
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Programming Impulsive Deformation with Mechanical Metamaterials.

Xudong Liang1, Alfred J Crosby1

  • 1Polymer Science and Engineering Department, University of Massachusetts Amherst, Amherst, Massachusetts 01003, USA.

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Summary
This summary is machine-generated.

Biological systems use impulsive deformation for rapid movement. Specific internal structures in metamaterials optimize energy conversion, overcoming efficiency limits in homogeneous materials.

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Area of Science:

  • Materials Science
  • Biomechanics
  • Mechanical Engineering

Background:

  • Impulsive deformation in biology enables high-acceleration movements by storing and rapidly releasing elastic energy.
  • This process, known as power amplification, circumvents the force-velocity trade-off but often suffers from low energy conversion efficiency in homogeneous materials due to asymmetric strain rates.

Purpose of the Study:

  • To investigate how internal structural designs in metamaterials can independently tune energy storage and release dynamics.
  • To optimize the conversion of elastic energy into kinetic energy, overcoming the limitations of homogeneous materials.

Main Methods:

  • Development and experimental testing of mechanical metamaterials with specific internal structural designs.
  • Quantitative modeling of energy storage and elastic recoil processes.
  • Comparison of energy conversion efficiency between structured metamaterials and unstructured materials.

Main Results:

  • Specific internal structures allow independent tuning of quasistatic loading and high-speed recoil.
  • Metamaterials with optimized internal structures demonstrated significantly enhanced energy conversion efficiency compared to unstructured materials.
  • A quantitative model for tuning energy conversion via internal structures was developed and experimentally validated.

Conclusions:

  • Internal structural design is a key factor in controlling energy storage and conversion efficiency in metamaterials.
  • This approach offers a pathway to design materials that mimic and surpass biological mechanisms for power-amplified motion.
  • The findings provide a foundational understanding for developing advanced materials for applications requiring rapid, high-energy release.