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Related Concept Videos

Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

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In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as...
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Stress-Strain Diagram - Brittle Materials01:24

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Brittle materials, including glass, cast iron, and stone, exhibit unique characteristics. They fracture without considerable change in their elongation rate, indicating that their breaking and ultimate strength are equivalent. Such materials also show lower strain levels at the point of rupture. The failure in brittle materials predominantly results from normal stresses, as evidenced by the rupture created along a surface perpendicular to the applied load. These materials do not display...
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Hooke's Law01:26

Hooke's Law

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Hooke's law, a pivotal principle in material science, establishes that the strain a material undergoes is directly proportional to the applied stress, defined by a factor called the modulus of elasticity or Young's modulus.
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Generalized Hooke's Law

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The generalized Hooke's Law is a broadened version of Hooke's Law, which extends to all types of stress and in every direction. Consider an isotropic material shaped into a cube subjected to multiaxial loading. In this scenario, normal stresses are exerted along the three coordinate axes. As a result of these stresses, the cubic shape deforms into a rectangular parallelepiped. Despite this deformation, the new shape maintains equal sides, and there is a normal strain in the direction of the...
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Stress-Strain Diagram - Ductile Materials01:24

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The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
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Synthesis and Microdiffraction at Extreme Pressures and Temperatures
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2D Materials and Heterostructures at Extreme Pressure.

Linglong Zhang1,2, Yilin Tang2, Ahmed Raza Khan2

  • 1Institute of Microscale Optoelectronics College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen 518060 China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|December 21, 2020
PubMed
Summary

High pressure research on 2D materials and heterostructures reveals how pressure tunes electronic and structural properties. This enables engineering van der Waals interactions for novel applications in optoelectronics and photovoltaics.

Keywords:
2D materialsdiamond anvil cell (DAC)high pressuremetallizationoptoelectronicssuperconducting

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High Pressure Single Crystal Diffraction at PX^2
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High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions
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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) materials exhibit tunable properties (semiconducting, metallic, superconducting) crucial for optoelectronics and photovoltaics.
  • Van der Waals (vdW) interactions in 2D materials can be engineered using external stimuli like pressure.

Purpose of the Study:

  • To summarize recent advancements in high-pressure research on 2D materials and heterostructures.
  • To analyze pressure-induced changes in structure, electronic properties, and phonon dynamics.
  • To highlight pressure-optimized properties and future directions for vdW interaction engineering.

Main Methods:

  • Utilized diamond anvil cell (DAC) for high-pressure experiments.
  • Investigated a range of 2D materials including graphene, transition metal dichalcogenides, and MXenes.
  • Performed detailed analysis of structural, electronic, optical, and superconducting properties under pressure.

Main Results:

  • Pressure significantly modifies the electronic structure, crystal structure, and morphology of 2D materials.
  • Observed pressure-induced metallization, superconductivity, and altered phonon dynamics.
  • Demonstrated the potential for optimizing 2D material properties through pressure for advanced applications.

Conclusions:

  • High-pressure studies provide fundamental insights into structure-property relationships in 2D materials.
  • Pressure is a powerful tool for tuning and optimizing the performance of 2D materials and heterostructures.
  • Engineering vdW interactions under pressure offers a promising pathway for novel device functionalities.