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Related Concept Videos

Stress-Strain Diagram01:10

Stress-Strain Diagram

A stress-strain diagram is a crucial tool that graphically displays a material's mechanical characteristics. This diagram is derived from a tensile test performed on a carefully prepared cylindrical specimen. The specimen has two gauge marks inscribed on its central part, and the distance between these marks is known as the gauge length. The cylindrical specimen is placed in a testing machine, which applies an increasing centric load. As this load grows, so does the gauge length. This change in...
Residual Stresses01:26

Residual Stresses

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...
Residual Stresses in Circular Shafts01:10

Residual Stresses in Circular Shafts

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 shaft's...
Residual Stresses in Bending01:18

Residual Stresses in Bending

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...
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
Measurements of Strain01:27

Measurements of Strain

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 gauge...

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Related Experiment Video

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Using Digital Image Correlation to Characterize Local Strains on Vascular Tissue Specimens
09:29

Using Digital Image Correlation to Characterize Local Strains on Vascular Tissue Specimens

Published on: January 24, 2016

Deformation-pattern-based digital image correlation method and its application to residual stress measurement.

Jianxin Gao1, Haixia Shang

  • 1TWI Ltd., Granta Park, Great Abington, Cambridge CB21 6AL, UK. jianxin.gao@twi.co.uk

Applied Optics
|March 3, 2009
PubMed
Summary

This study introduces a novel digital image correlation method for measuring residual stresses. The technique uses image transformation to directly calculate stresses, proving effective in validation tests.

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Area of Science:

  • Mechanical Engineering
  • Materials Science
  • Optical Measurement Techniques

Background:

  • Residual stresses significantly impact material performance and structural integrity.
  • Accurate measurement of residual stresses is crucial for quality control and failure analysis.
  • Existing methods for residual stress measurement can be complex and time-consuming.

Purpose of the Study:

  • To develop a direct and computationally efficient method for measuring residual stresses.
  • To utilize digital image correlation (DIC) in conjunction with the hole drilling method.
  • To transform the residual stress measurement problem into an image processing and numerical computation task.

Main Methods:

  • Employed digital image correlation (DIC) to capture deformation patterns.
  • Used the hole drilling method to induce controlled deformation.
  • Applied an affine transformation to the deformed image, guided by residual stress values.
  • Optimized trial residual stress components to maximize image similarity post-transformation.

Main Results:

  • Achieved direct measurement of residual stresses through image analysis.
  • Demonstrated the viability of the proposed approach through validation tests.
  • The method converts residual stress measurement into a purely numerical computational process.

Conclusions:

  • The developed DIC-based hole drilling method offers a direct and efficient way to measure residual stresses.
  • The technique's computational nature simplifies the measurement process.
  • The underlying principles can be adapted for other measurement tasks involving known deformation patterns.