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Related Concept Videos

Thermal Strain01:19

Thermal Strain

2.8K
Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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Shearing Strain01:20

Shearing Strain

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The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
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Measurements of Strain01:27

Measurements of Strain

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Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
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Strain Energy01:13

Strain Energy

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Strain energy is a fundamental concept in the field of materials science and structural engineering, describing the energy absorbed by a material or structure when it is deformed under load.
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Stress-Strain Diagram01:10

Stress-Strain Diagram

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A stress-strain diagram is a crucial tool that graphically displays a material's mechanical characteristics. This diagram is derived from a tensile test performed on a carefully prepared cylindrical specimen. The specimen has two gauge marks inscribed on its central part, and the distance between these marks is known as the gauge length. The cylindrical specimen is placed in a testing machine, which applies an increasing centric load. As this load grows, so does the gauge length. This...
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Transformation of Plane Strain01:12

Transformation of Plane Strain

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When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...
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Related Experiment Video

Updated: Jan 22, 2026

Writing Bragg Gratings in Multicore Fibers
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Bragg Coherent Modulation Imaging of Highly Strained Nanocrystals.

Jiangtao Zhao1, Ewen Bellec2, Marie-Ingrid Richard2

  • 1ESRF, The European Synchrotron, 71 Avenue des Martyrs, 38000 Grenoble, France.

Physical Review Letters
|January 20, 2026
PubMed
Summary
This summary is machine-generated.

Bragg coherent diffraction imaging now works for nanocrystals with high strain variations. Bragg coherent modulation imaging resolves these challenges, enabling precise 3D lattice strain measurements.

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Area of Science:

  • Materials Science
  • Crystallography
  • Diffraction Imaging

Background:

  • Bragg coherent diffraction imaging (BCDI) is limited by strain inhomogeneities in nanocrystals.
  • This limitation restricts BCDI applications in various scientific fields.

Purpose of the Study:

  • To overcome the limitations of BCDI for nanocrystals with large strain variations.
  • To introduce and demonstrate Bragg coherent modulation imaging (BCMI).

Main Methods:

  • Incorporated wavefront modulation into the diffracted beam.
  • Applied BCMI to nanocrystals with significant strain inhomogeneities.

Main Results:

  • Achieved unambiguous structure recovery in highly strained nanocrystals.
  • Demonstrated the experimental realization of BCMI.

Conclusions:

  • BCMI offers a robust solution for analyzing nanocrystals with large strain variations.
  • This method enhances the capability for precise 3D lattice strain measurements in nanocrystals.