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Related Concept Videos

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Plastic Deformations

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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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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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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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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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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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Determining the Mechanical Strength of Ultra-Fine-Grained Metals
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Plastic deformation in nanodiamonds.

Jiaqi Zhang1,2, Chunmeng Liu1, Xing Li1

  • 1Henan Key Laboratory of Diamond Materials and Devices, Key Laboratory of Materials Physics, Ministry of Education, and School of Physics, Zhengzhou University, Zhengzhou, China.

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|March 5, 2026
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Summary
This summary is machine-generated.

Nanodiamonds exhibit ultralarge plasticity through amorphization, enabling over 90% strain without fracture. This nanoscale phenomenon is size-dependent, occurring only in diamonds smaller than 13 nm.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Mechanical Engineering

Background:

  • Diamond's sp³ covalent bonds provide exceptional hardness and thermal conductivity.
  • Intrinsic brittleness of diamond limits its deformation and processing capabilities.

Purpose of the Study:

  • To investigate ultralarge plasticity in nanodiamonds.
  • To understand the deformation mechanisms governing nanodiamond behavior under stress.

Main Methods:

  • Utilized a custom-designed in-situ transmission electron microscopy (TEM) mechanical holder.
  • Applied mechanical stress to nanodiamond samples within the TEM.

Main Results:

  • Observed amorphization-mediated ultralarge plasticity in nanodiamonds, accommodating over 90% compressive strain.
  • Deformation mechanism involves formation of an amorphous carbon network, facilitating grain rotation and sliding.
  • Identified a size-dependent transition: ultralarge plasticity observed below ~13 nm, while larger diamonds deform brittlely.

Conclusions:

  • Amorphization is a key mechanism for achieving extreme plasticity in nanodiamonds.
  • Size-dependent behavior is critical for understanding nanodiamond mechanical properties.
  • Findings open opportunities for nanodiamond-based manufacturing, strain engineering, and advanced device applications.