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

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

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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Updated: Jun 11, 2026

Characterization of Full Set Material Constants and Their Temperature Dependence for Piezoelectric Materials Using Resonant Ultrasound Spectroscopy

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Published on: April 27, 2016

Multimaterial piezoelectric fibres.

S Egusa, Z Wang, N Chocat

Nature Materials

|July 13, 2010

Summary

This summary is machine-generated.

Researchers developed a novel piezoelectric fiber capable of dynamic property changes. This breakthrough enables new possibilities for active fiber-based devices operating across a wide frequency range.

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Last Updated: Jun 11, 2026

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Area of Science:

Materials Science
Nanotechnology
Optoelectronics

Background:

Traditional fibers are static, limiting dynamic applications.
Existing methods for fiber property modulation face material limitations.
A need exists for active fibers with tunable characteristics.

Discussion:

A composite fiber structure with a crystalline, non-centrosymmetric ferroelectric polymer phase was engineered.
The fiber integrates a thin ferroelectric layer with internal electrodes and polymer cladding.
This structure allows for the fabrication of meter-scale piezoelectric fibers via thermal drawing.

Key Insights:

The novel piezoelectric fibers exhibit acoustic transduction from kHz to MHz frequencies.
Demonstrated a single-fiber device integrating a Fabry-Perot optical resonator and piezoelectric transducer.
Achieved electrically driven, dynamic control over fiber properties.

Outlook:

Potential for advanced fiber-optic sensors and communication systems.
Opens avenues for tunable optical components and active metamaterials.
Enables development of novel microelectronic and photonic devices.