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Related Concept Videos

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

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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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Quantum Numbers

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Plastic Deformation in a Quantum Solid: Dislocation Avalanches and Creep in Helium.

Zhi Gang Cheng1,2, John Beamish2

  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.

Physical Review Letters
|August 18, 2018
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Summary
This summary is machine-generated.

Researchers observed dislocation avalanches and continuous creep in solid helium-4 (hcp 4He) below 0.4 K. These quantum solid phenomena mimic metallurgical plasticity, revealing novel defect behavior in quantum solids.

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Area of Science:

  • Solid-state physics
  • Quantum materials science
  • Low-temperature physics

Background:

  • Conventional solids exhibit elastic and plastic deformation governed by dislocation motion.
  • Understanding plasticity in quantum solids is crucial for exploring unique defect behaviors.
  • Helium-4 (He) offers a unique system dominated by quantum effects at low temperatures.

Purpose of the Study:

  • To investigate plastic deformation and dislocation dynamics in hexagonal close-packed (hcp) solid He.
  • To identify and characterize "metallurgical" phenomena, such as dislocation avalanches, in a quantum solid.
  • To explore the transition from avalanche behavior to continuous creep in hcp He.

Main Methods:

  • Experiments conducted on hcp He below 0.4 K.
  • Measurement of stress-strain relationships and acoustic emissions.
  • Observation of slip event dimensions and creep behavior at various temperatures.

Main Results:

  • A strain threshold for elastic deformation was identified, leading to sudden stress drops and acoustic emissions.
  • Dislocation avalanches with dimensions ranging from millimeters to microns were observed.
  • At higher temperatures, avalanches transitioned to continuous creep, with steady flow observed at stresses as low as 400 Pa.

Conclusions:

  • Quantum effects significantly influence defect behavior in hcp He, leading to plasticity analogous to conventional metals.
  • Dislocation avalanches represent a key mechanism of plastic deformation in this quantum solid.
  • The observed transition to continuous creep highlights the temperature-dependent nature of dislocation dynamics in quantum solids.