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Full-field strain mapping by optical correlation of micrographs acquired during deformation
J Quinta D A Fonseca1, P M Mummery, P J Withers
1Manchester Materials Science Centre, Grosvenor Street, Manchester M1 7HS, U.K. joao.fonseca@manchester.ac.uk
Journal of Microscopy
|April 9, 2005
Summary
Optical correlation provides full-field surface strain mapping by comparing images before, during, and after deformation. This technique analyzes micrographs from in situ deformation studies without surface preparation, revealing strain heterogeneity linked to microstructure.
Area of Science:
- Materials Science
- Optical Metrology
- Mechanical Engineering
Background:
- Optical correlation is an emerging technique for full-field surface strain mapping.
- It analyzes images of a region before, during, and after deformation.
- Applicable to micrographs from in situ deformation studies.
Purpose of the Study:
- Present fundamental aspects of optical correlation.
- Emphasize its applicability to in situ deformation studies.
- Discuss practical issues affecting accuracy and spatial resolution.
Main Methods:
- Comparing images of the same region before, during, and after deformation.
- Analyzing image sequences from in situ deformation tensile tests.
- Applied to antler bone and ferritic steel.
Main Results:
- Strain maps obtained without requiring surface patterns or coatings.
- Demonstrated applicability to diverse materials like bone and steel.
- Strain heterogeneity can be related to underlying microstructure.
Conclusions:
- Optical correlation is a versatile strain-mapping technique.
- Practical considerations like image quality influence results.
- Enables microstructure-based analysis of material deformation.