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Related Concept Videos

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

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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.
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Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

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As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
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Elastic Strain Energy for Normal Stresses01:22

Elastic Strain Energy for Normal Stresses

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Strain energy quantifies the energy stored within a material due to deformation under loading conditions, a fundamental concept in materials science and engineering. The strain energy can be modeled when a material is subjected to axial loading with uniformly distributed stress. In this scenario, the stress experienced by the material is the internal force divided by the cross-sectional area, and the strain induced is directly proportional to this stress through the modulus of elasticity.
If...
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Symmetric Member in Bending01:07

Symmetric Member in Bending

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In the study of the mechanics of materials, analyzing the behavior of prismatic members under opposing couples is crucial for understanding internal stress distributions, which are essential for structural design. When subjected to couples, a prismatic member experiences internal forces that maintain equilibrium. A couple, characterized by two equal and opposite forces, creates a moment but no resultant force. The internal forces at any section cut of the member must balance these external...
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Flexural Stress01:16

Flexural Stress

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When analyzing bending in symmetric members, it's crucial to understand how stresses distribute when subjected to bending moments. This stress distribution is effectively described by applying fundamental mechanics and material science principles, particularly Hooke's Law for elastic materials.
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Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

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Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
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Dominant In-Plane Symmetric Elastoresistance in CsFe_{2}As_{2}.

P Wiecki1, A-A Haghighirad1, F Weber1

  • 1Karlsruhe Institute of Technology, Institute for Quantum Materials and Technologies, 76021 Karlsruhe, Germany.

Physical Review Letters
|November 16, 2020
PubMed
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We investigated the elastoresistance of the correlated material CsFe2As2. Thermal expansion neutralization is crucial, revealing a large in-plane response and supporting a coherence-incoherence crossover model tuned by atomic distances.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Physics

Background:

  • Highly correlated materials like CsFe2As2 exhibit complex electronic behaviors.
  • Understanding elastoresistance is key to probing electronic states and phase transitions.
  • Nematicity in correlated systems remains an active area of research.

Purpose of the Study:

  • To comprehensively study the elastoresistance of CsFe2As2 across all symmetry channels.
  • To investigate the role of thermal expansion in elastoresistance measurements.
  • To determine the underlying mechanism driving the observed elastoresistance behavior.

Main Methods:

  • Utilizing a piezoelectric-based strain cell to precisely control and neutralize thermal expansion.
  • Performing elastoresistance measurements in various symmetry channels.
  • Analyzing the data within theoretical frameworks, including coherence-incoherence crossover models.

Main Results:

  • Neutralizing thermal expansion was found to be essential for accurate elastoresistance measurements.
  • A large elastoresistance response was observed in the in-plane symmetric channel.
  • Weaker responses in symmetry-breaking channels showed no evidence of divergent nematic susceptibility.

Conclusions:

  • The elastoresistance of CsFe2As2 is strongly influenced by in-plane atomic distances.
  • Results are consistent with a coherence-incoherence crossover model.
  • The study highlights the importance of precise strain control in correlated materials research.