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Related Concept Videos

Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

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One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Plastic Deformation in Circular Shafts01:20

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When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
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Residual Stresses in Circular Shafts01:10

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In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the...
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Circular Shaft - Stresses in Linear Range01:13

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Consider a scenario where a circular shaft is subject to torque that remains within the boundaries of Hooke's Law, avoiding any permanent deformation. So, the formula for shearing strain is revisited. This formula is multiplied by the modulus of rigidity, and then Hooke's Law for the shearing stress and strain is applied. As a result, the equation for shearing stress in a shaft can be derived.
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Lumber Defects01:23

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Lumber defects, which can affect both the appearance and structural integrity of wood, include a variety of growth and manufacturing flaws. Growth defects such as knots and knotholes occur where branches were once attached to the tree trunk, with knotholes forming when these knots fall out. Other natural defects include decay and insect damage, which compromise the wood's strength and durability.
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Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography
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Surface circular-arc defects interacted by laser-generated Rayleigh wave.

Zheng Zhang1, Jinfeng Zhao1, Yongdong Pan1

  • 1School of Aerospace Engineering and Applied Mechanics, Tongji University, 100 Zhangwu Road, 200092 Shanghai, People's Republic of China.

Ultrasonics
|February 17, 2020
PubMed
Summary
This summary is machine-generated.

This study uses the finite element method (FEM) to analyze laser-generated Rayleigh waves interacting with quarter-arc surfaces. The research demonstrates improved depth gauging accuracy for circular-arc defects using laser ultrasonics.

Keywords:
Circular-arcDefectLaser ultrasonic techniqueRayleigh wave

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Area of Science:

  • * Physics and Materials Science
  • * Non-Destructive Testing (NDT) and Evaluation

Background:

  • * Understanding Rayleigh wave propagation is crucial for surface defect detection.
  • * Laser ultrasonics offers a non-contact method for material analysis.
  • * Thermoelastic interactions influence wave behavior at material transitions.

Purpose of the Study:

  • * To investigate Rayleigh wave propagation at quarter-arc transition surfaces.
  • * To establish the relationship between circular-arc radius and wave characteristics.
  • * To assess the feasibility of depth gauging for circular-arc defects using laser ultrasonics.

Main Methods:

  • * Finite Element Method (FEM) simulations were employed.
  • * Analysis of laser-generated Rayleigh waves under thermoelastic conditions.
  • * Comparison of wave behavior at quarter-arc versus perpendicular transition surfaces.

Main Results:

  • * Rayleigh wave amplitude changes with increasing arc radius, differing from perpendicular surfaces.
  • * Transmitted Rayleigh wave arrival times enable more accurate depth gauging of circular-arc defects compared to rectangular ones.
  • * Simulation findings were validated by experimental results.

Conclusions:

  • * The study provides insights into Rayleigh wave interaction with curved surfaces.
  • * Laser ultrasonics can quantitatively detect the depth of surface circular-arc defects.
  • * Findings have practical implications for engineering component inspection.