Method and sensors for predetermining dynamic moduli in situ of

Details Method and sensors for predetermining dynamic moduli in situ of Method and sensors for predetermining dynamic moduli in situ of

1974-04-29

1976-02-10

Myracle, Jerry W.

Measuring and testing

Ductility or brittleness

310 83, G01L 116

Patent

active

039370704

ABSTRACT:
The method and sensors are capable of measuring dynamic moduli of nongaseous fluid and semi-fluid materials. When cast in a castable-type material, such as solid rocket propellant, changes due to chemical aging of the propellant or other substances being tested may be detected. The sensors include a spacer separating a pair of piezoelectric crystals with substantially no air gaps between the crystals. One of the crystals is driven while the other is connected to a recording device. The measured response of the sensor in-situ or immersed in a work sample is compared with the response in air. The elastic modulus and loss tangent of the tested material may be computed based upon the amplitude and phase of the sensor's response.

REFERENCES:
patent: 3205464 (1965-09-01), Schwartz
patent: 3395564 (1968-08-01), Rastrelli et al.

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