Method and apparatus for measuring the loss modulus of materials

Details Method and apparatus for measuring the loss modulus of materials Method and apparatus for measuring the loss modulus of materials

1978-02-24

1979-10-09

Myracle, Jerry W.

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

73812, G01N 338

Patent

active

041701410

ABSTRACT:
The loss modulus of a material is ascertained by subjecting a sample of the material to a mechanical vibration at the resonant frequency of the material. The dynamic driving force required to maintain the material in mechanical vibration at its resonant frequency is measured. Next, the static driving force required to displace the same material the same distance as when vibrating is measured. The quotient of the dynamic force divided by the static force is proportional to the tangent of the angle between elastic modulus and loss modulus of the material, or tan .delta.. Since the frequency of the material, when in vibration, is related to the elastic modulus of material, the loss modulus may be readily computed by multiplying the elastic modulus by tan .delta..
An apparatus capable of performing this method includes a driving system that vibrates the sample material at its resonant frequency using a sinusoidal driving force which is 90.degree. out of phase with the material displacement and hence in phase with the sample's loss function.

REFERENCES:
patent: 3501952 (1970-03-01), Gergen et al.
patent: 3508437 (1970-04-01), Van Beek
patent: 3751977 (1973-08-01), Schilling, Jr.
patent: 4034602 (1977-07-01), Woo et al.
patent: 4049997 (1977-09-01), McGhee

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