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Related Concept Videos

Strain and Elastic Modulus01:15

Strain and Elastic Modulus

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The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...
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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.
Hooke's Law states that within the material's elastic limits, stress is directly proportional to strain. In a member experiencing a bending moment, the strain at any point is relative to its distance...
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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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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

812
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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Bending of Members Made of Several Materials01:11

Bending of Members Made of Several Materials

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In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...
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Related Experiment Video

Updated: Apr 24, 2026

Strain Sensing Based on Multiscale Composite Materials Reinforced with Graphene Nanoplatelets
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Enhanced strain gradient in structural wood for high flexoelectricity.

Ying Gao1,2,3, Chen Cao1, Qi Xu1

  • 1School of Materials and Energy, Lanzhou University, Lanzhou, China.

Nature Communications
|April 22, 2026
PubMed
Summary

Researchers discovered high flexoelectricity in modified wood, a widespread electromechanical property. This breakthrough enables flexible wood applications in sensors and energy harvesting.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Biomaterials Engineering

Background:

  • Flexoelectricity, unlike piezoelectricity, is a widespread electromechanical property in solids, applicable to flexoelectronics, sensing, actuation, and energy harvesting.
  • While investigated in synthetic materials, flexoelectricity remains unexplored in natural biomaterials like wood.

Purpose of the Study:

  • To investigate and report high flexoelectricity in natural wood.
  • To explore structural modification methods for enhancing wood's flexoelectric properties.
  • To demonstrate practical applications of flexoelectric wood.

Main Methods:

  • Structural modification of wood via delignification and compression.
  • Measurement of flexoelectric coefficient in modified wood.
  • Development of a flexible wood-based sensor.

Main Results:

  • Observation of high flexoelectricity in structurally modified wood.
  • Achieved flexoelectric coefficient (36.72 nC·m⁻¹) comparable to dielectric ceramics.
  • Demonstrated a functional flexible wood-based sensor for detecting human motion.

Conclusions:

  • Wood exhibits significant flexoelectric properties after structural modification.
  • The observed flexoelectricity originates from cellulose's molecular structure and wood's architecture.
  • This research opens avenues for utilizing flexible wood in electromechanical devices.