Southwest Research Institute

Alexander Beltran Bernardo

Gary Lane Burkhardt

Arthur Edwin Nicholls

Walter Mac Gray

A method and system for measuring radial strain on powder or other granular material while the powder is subject to compressive axial and radial loading. The powder is contained within a pliable sleeve. As pressure is applied to the powder, the sleeve changes diameter. An optical emitter emits a beam of light, which is intersected by the entire diameter of the sleeve. An optical sensor receives the intersected beam, and generates a response signal that indicates the diameter of the sleeve. This change in diameter can be related to a constitutive property such as strain.

Measurement of constitutive properties of a powder subject to compressive axial and radial loading, using optical sensing

A method and system for measuring constitutive properties, such as radial strain, on a specimen of power or other granular material while the specimen is subject to compressive axial and radial loading. The specimen fills a pliable sleeve that has a conductive band around its circumference. An eddy current coil is placed around the sleeve, and used to provide a response signal that indicates the diameter of the sleeve, which in turn indicates radial strain.

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San Antonio, TX, United States of America

Alexander Beltran Bernardo