Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Specified electrical sensor or system
Patent
1993-08-26
1995-06-13
Williams, Hezron E.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Specified electrical sensor or system
73818, 324209, G01N 308
Patent
active
054232228
ABSTRACT:
A nondestructive method for determining the amount of deformation induced in a material by a compressive force is provided that includes the steps of uniformly dispersing a quantity of a particulate tagging substance in the material whose presence and distribution is detectable by a form of radiant energy, applying a compressive to the material, and then determining the extent to which the material is compressively deformed by transmitting the appropriate radiant energy through the material to determine changes in the density and distribution of the particulate tagging substance. The method may advantageously be applied to determine the extent to which a granular material such as asphalt concrete has been compacted over a roadbed, as well as to determine strain and wear patterns in gaskets formed from elastic materials.
REFERENCES:
patent: 3861206 (1975-01-01), Kawafune et al.
patent: 4322983 (1982-04-01), Sado
patent: 4944185 (1990-07-01), Clark, Jr. et al.
Clark, Jr. et al., "Tagged Adhesives for Improved Electromagnetic Inspection", Apr. 1989.
Clark, Jr. William G.
Rudd George E.
Sadhir Rajender K.
Shannon Robert E.
Ashraf Nashmiya
Westinghouse Electric Corporation
Williams Hezron E.
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