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Related Concept Videos

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...
168
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

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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...
217
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...
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Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

267
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
267
Generalized Hooke's Law01:22

Generalized Hooke's Law

935
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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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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Updated: Jul 5, 2025

Biophysical Assays to Probe the Mechanical Properties of the Interphase Cell Nucleus: Substrate Strain Application and Microneedle Manipulation
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Patternable Process-Induced Strain in 2D Monolayers and Heterobilayers.

Yue Zhang1, M Abir Hossain1,2, Kelly J Hwang1

  • 1Department of Mechanical Science and Engineering, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, United States.

ACS Nano
|January 24, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a CMOS-compatible method to precisely control strain in 2D materials like MoS2. This strain engineering enables tailored optical and electronic properties for advanced semiconductor applications.

Keywords:
2D materialsinterfacial mechanicsnanomechanicsoptical spectroscopystrain engineering

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Strain engineering is crucial for tuning properties of 2D materials but lacks precise control.
  • Existing methods are often not compatible with semiconductor manufacturing processes.

Purpose of the Study:

  • To develop a device-compatible technique for patterning complex strain profiles in 2D materials.
  • To investigate the application of process-induced strain engineering in monolayer MoS2 and 2D heterostructures.
  • To quantify the mechanical properties governing strain induction.

Main Methods:

  • Utilized process-induced strain engineering, a technique common in the semiconductor industry.
  • Developed and applied a traction-separation model to predict strain distributions.
  • Fabricated and characterized monolayer MoS2 and MoS2-WSe2 heterobilayers.

Main Results:

  • Successfully patterned complex strain profiles in monolayer MoS2 and 2D heterostructures.
  • Identified an interfacial traction coefficient of 1.3 ± 0.7 MPa/μm and a damage initiation threshold of 16 ± 5 nm.
  • Demonstrated spatial patterning of the optical band gap with a tuning rate of 91 ± 1 meV/% strain.
  • Induced interlayer heterostrain in MoS2-WSe2 heterobilayers.

Conclusions:

  • Process-induced strain engineering offers a CMOS-compatible route for precise strain control in 2D materials.
  • This approach enables tailored optical properties and interlayer strain engineering for advanced applications.
  • The findings support the integration of 2D materials into CMOS technologies, moiré engineering, and quantum systems.