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Study on deformation evolution law of coal under asymmetric loading by digital image correlation
Applied Optics
|December 28, 2020
Summary
Digital image correlation reveals distinct failure modes in raw coal and briquette under stress. Briquette coal exhibits tensile failure, while raw coal shows shear failure, with both experiencing shear failure under asymmetric loading.
Area of Science:
- Geotechnical Engineering
- Materials Science
- Solid Mechanics
Background:
- Understanding coal failure mechanisms is crucial for mining safety and resource extraction.
- Complex stress environments significantly influence the deformation and damage behavior of coal materials.
- Digital Image Correlation (DIC) offers a non-contact method to analyze strain and deformation fields.
Purpose of the Study:
- To investigate the deformation and damage processes of raw coal and briquette under complex stress conditions.
- To compare the failure mechanisms and strain field evolution between raw coal and briquette.
- To analyze the influence of symmetrical and asymmetrical loading on coal material behavior.
Main Methods:
- Innovative application of Digital Image Correlation (DIC) to monitor coal deformation.
- Experimental testing of raw coal and briquette under controlled symmetrical and asymmetrical stress loading.
- Analysis of strain field evolution and crack propagation using DIC data.
Main Results:
- Under symmetrical loading, briquette coal showed tensile failure, while raw coal exhibited shear failure.
- Under asymmetrical loading, both raw coal and briquette displayed three characteristic strain field evolution stages.
- Briquette coal was more prone to strain localization, with shear failure dominating in both materials.
Conclusions:
- The study elucidates the differential failure modes of raw coal and briquette under varying stress states.
- Strain localization is a key phenomenon, particularly in briquette under asymmetric loading.
- A quadratic relationship exists between localized starting stress and the asymmetric coefficient for both coal types.
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