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Related Concept Videos

Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

273
An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the...
273
Angle of Twist - Elastic Range01:13

Angle of Twist - Elastic Range

289
Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
289
Transformation of Plane Strain01:12

Transformation of Plane Strain

165
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...
165
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

216
Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
216
Unsymmetric Bending01:18

Unsymmetric Bending

331
Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from those in symmetrical bending, and are essential for designing structures to withstand different loading conditions. In unsymmetrical bending, the neutral axis—where stress is zero—does not necessarily align with the geometric axes of the cross-section. The...
331
Torsion of Noncircular Members01:16

Torsion of Noncircular Members

137
Circular shafts undergoing torsional stress maintain their cross-sectional integrity due to their axisymmetric nature. This symmetry ensures an even distribution of stress, allowing the shaft to withstand torsion without distorting. In contrast, square bars, lacking this axial symmetry, experience significant distortion across their cross-sections when subjected to torsion, with the exception of along their diagonals and at lines connecting midpoints. A detailed examination of a cubic element...
137

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Related Experiment Video

Updated: Jul 2, 2025

Fabricating van der Waals Heterostructures with Precise Rotational Alignment
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In-plane anisotropic two-dimensional materials for twistronics.

Hangyel Kim1, Changheon Kim1,2, Yeonwoong Jung3,4,5

  • 1Department of Material Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea.

Nanotechnology
|February 22, 2024
PubMed
Summary
This summary is machine-generated.

In-plane anisotropic 2D materials offer unique orientation-dependent properties and phenomena through stacking. Their twistronics show potential for advanced optoelectronic devices.

Keywords:
in-plane anisotropymoiré superlatticetwistronicstwo-dimensional materialsvan der Waals heterostructure

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • In-plane anisotropic 2D materials possess orientation-dependent properties due to their lower symmetry unit cells.
  • These materials exhibit more diverse physical properties compared to their isotropic counterparts.
  • Artificial stacking of these anisotropic materials can lead to emergent phenomena not observed in isotropic systems.

Discussion:

  • Overview of representative in-plane anisotropic 2D materials including black phosphorus, group IV monochalcogenides, and specific phases of group VI transition metal dichalcogenides (1T' and Td) and rhenium dichalcogenides.
  • Exploration of recent theoretical and experimental advancements in twistronics utilizing in-plane anisotropic 2D materials.
  • Analysis of how the unique properties of these materials can be harnessed for novel device applications.

Key Insights:

  • Anisotropy in 2D materials leads to unique electronic and optical characteristics.
  • Stacking engineering of anisotropic 2D materials opens pathways to novel quantum phenomena.
  • Twistronics with anisotropic 2D materials is a rapidly developing field with significant implications.

Outlook:

  • In-plane anisotropic 2D materials and their twistronics hold substantial promise for future technological advancements.
  • Potential for developing next-generation orientation-dependent optoelectronic devices.
  • Further research into material synthesis, property characterization, and device integration is crucial.