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Related Concept Videos

Residual Stresses in Circular Shafts01:10

Residual Stresses in Circular Shafts

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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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Residual Stresses01:26

Residual Stresses

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Residual stresses reside in a structure even after removing the original stress inducer. This phenomenon often arises from varied plastic deformations across different parts of a structure. Consider a rod stretched beyond its yield point. It will not regain its original length due to permanent deformation. Even after load removal, the rod does not entirely lose stress because of uneven plastic deformations, resulting in residual stresses. The computation of these stresses in structures is...
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Residual Stresses in Bending01:18

Residual Stresses in Bending

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In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
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Stress: General Loading Conditions01:15

Stress: General Loading Conditions

630
To grasp the intricacy of real-world conditions where multiple loads are applied simultaneously to a structure, one might visualize a section passing through a specific point within a body, aligned parallel to the xy plane. This section is subjected to various forces, including original loads, normal forces, and shearing forces.
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes....
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Applications of Stress01:04

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Consider a structure made of a boom and a rod designed to support a load. These two components are connected by a pin and stabilized by brackets and pins. The boom and the rod are detached from their supports to assess the different stresses imposed on this structure, and a free-body diagram is drawn. Then, all the forces applied, including the load acting on the structure, are identified. The reaction forces exerted on both the boom and the rod are computed using the equilibrium equations.
The...
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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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Residual Stress Analysis Based on Acoustic and Optical Methods.

Sanichiro Yoshida1, Tomohiro Sasaki2, Masaru Usui3

  • 1Department of Chemistry and Physics, Southeastern Louisiana University, Hammond, LA 70402, USA. syoshida@selu.edu.

Materials (Basel, Switzerland)
|August 10, 2017
PubMed
Summary

This study combines acoustoelasticity and optical interferometry for advanced residual stress analysis. The novel approach enables quantitative, full-field, and non-destructive measurement of residual stresses.

Keywords:
acoustoelasticityelectronic speckle-pattern interferometryresidual stress analysisscanning acoustic microscopy

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Non-destructive Testing

Background:

  • Residual stresses significantly impact material performance and structural integrity.
  • Traditional methods for residual stress analysis have limitations in terms of measurement scope and absolute accuracy.
  • Acoustoelasticity offers absolute stress measurement but is point-based, while optical interferometry provides full-field deformation data but lacks absolute stress evaluation.

Purpose of the Study:

  • To develop a hybrid method combining acoustoelasticity and optical interferometry for quantitative, two-dimensional residual stress analysis.
  • To leverage the strengths of both techniques for comprehensive and non-destructive evaluation.
  • To validate the proposed method on a dissimilar material joint specimen.

Main Methods:

  • Acoustoelasticity was used to determine the elastic modulus at reference points via acoustic velocity measurements.
  • Optical interferometry measured the acceleration field under applied tensile load.
  • The acceleration field was correlated to residual stresses using harmonic oscillation theory and calibrated with acoustoelasticity data.

Main Results:

  • The combined method successfully provided quantitative, two-dimensional residual stress mapping.
  • Acoustic and optical measurements showed reasonable agreement in identifying both compressive and tensile residual stresses.
  • The study demonstrated the feasibility of non-destructively measuring residual stresses in dissimilar material joints.

Conclusions:

  • The co-application of acoustoelasticity and optical interferometry is a feasible and effective approach for advanced residual stress analysis.
  • This hybrid technique overcomes the limitations of individual methods, enabling precise, full-field, and non-destructive stress evaluation.
  • The findings have significant implications for quality control and structural health monitoring in various engineering applications.