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Temperature Dependent Deformation01:12

Temperature Dependent Deformation

179
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
179
Measurements of Strain01:27

Measurements of Strain

1.8K
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...
1.8K

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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
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Measurement of temperature dependent shear modulus using frequency dependent SAWs ToF delay in laser-induced

Xiang-En Liu1, Alexey M Lomonosov2, Zhong-Hua Shen1

  • 1School of Science, Nanjing University of Science and Technology, Nanjing, Jiangsu, China; MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing, Nanjing University of Science and Technology, Nanjing, 210094, Jiangsu, China.

Ultrasonics
|February 6, 2023
PubMed
Summary
This summary is machine-generated.

This study measures the temperature-dependent shear modulus of materials using laser-induced surface acoustic waves (SAWs). The method analyzes frequency-dependent time-of-flight variations to accurately determine material properties under dynamic heating.

Keywords:
Dynamic laser heatingFrequency dependent ToFSurface wave dispersionTemperature dependence elasticityTime–frequency analysis

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Area of Science:

  • Materials Science
  • Acoustics
  • Thermodynamics

Background:

  • Surface acoustic waves (SAWs) exhibit frequency-dependent phase velocity in inhomogeneous media.
  • Local and dynamic heating creates temperature gradients affecting material elastic properties.

Purpose of the Study:

  • To develop a method for measuring temperature-dependent shear modulus using SAW time-of-flight.
  • To investigate the dispersion of SAWs in materials with spatially varying temperature fields.

Main Methods:

  • Generation of broad-band SAWs using pulsed laser heating.
  • Time-frequency analysis and differential techniques to measure frequency-dependent time-of-flight variations.
  • Solving an inverse problem using differential evolution to extract material properties.

Main Results:

  • Successfully measured frequency-dependent time-of-flight variations of SAWs.
  • Evaluated temperature-dependent shear modulus and surface temperature distribution.
  • Obtained shear modulus for Ti-6Al-4V alloy consistent with literature values.

Conclusions:

  • The proposed method accurately determines temperature-dependent shear modulus.
  • SAW dispersion analysis is effective for characterizing materials under dynamic thermal loads.
  • This technique offers a non-contact method for evaluating thermomechanical properties.