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Related Concept Videos

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Plasticity

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Plasticity is the property where an object loses its elasticity and undergoes irreversible deformation, even after the deformation forces are eliminated. If a material deforms irreversibly without increasing stress or load, then this is called ideal plasticity. For example, when a force is applied to an aluminum rod, it changes its shape, but it does not return to its original shape once the force is removed. Plastic deformation or ductility is thus a permanent deformation or change in the...
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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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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

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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 Behavior01:21

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A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
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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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Universal features of amorphous plasticity.

Zoe Budrikis1, David Fernandez Castellanos2, Stefan Sandfeld2,3

  • 1ISI Foundation, Via Chisola 5, 10126 Torino, Italy.

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Summary
This summary is machine-generated.

We developed a new model for amorphous plasticity, revealing universal behaviors in plastic deformation avalanches. This breakthrough offers insights into the critical phenomena governing material failure and yielding.

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Area of Science:

  • Materials Science
  • Statistical Physics
  • Solid Mechanics

Background:

  • Plastic yielding in amorphous solids is characterized by deformation avalanches, but their universality remains debated.
  • Existing models often rely on strong assumptions that contradict the statistical isotropy of amorphous materials.
  • Experimental and simulation methods face limitations in statistical sampling.

Purpose of the Study:

  • To introduce a novel, fully tensorial, stochastic mesoscale model for amorphous plasticity.
  • To bridge the gap between statistical physics of yielding and engineering mechanics.
  • To investigate the universality of deformation avalanches in amorphous solids.

Main Methods:

  • Development of a fully tensorial, stochastic mesoscale model.
  • Analysis of shear patterning and avalanche dynamics.
  • Comparison with existing mean-field depinning models.

Main Results:

  • The model captures complex shear patterns across various deformation modes and avalanche dynamics.
  • Plastic flow avalanches exhibit universal size exponents and scaling functions.
  • Avalanche characteristics are independent of dimensionality, boundary/loading conditions, and stress state.

Conclusions:

  • The developed model provides a robust framework for understanding amorphous plasticity.
  • Plastic yielding in amorphous solids represents a distinct type of critical phenomenon.
  • The findings challenge existing theories and offer new avenues for research in material science.