Title

The Evaluation Of Young's Complex Modulus Of Viscoelastic Materials

Report Number

WL-TR-91-3048 Volume I, p. CBB-1 thru CBB-17

Creator

Ostiguy, G.

Tardif, M.

Corporate Author

Ecole Polytechnique~ Montreal Quebec Canada

Laboratory

Wright Laboratory

Date

1991

Date Issued

1991-08

Extent

17

Contract

Laboratory Research - No Contract

DoD Project

2401

DoD Task

240104

Identifier

ADA241311

Format

1 online resource

Abstract

The motion of a root-excited cantilever beam coated on both sides with a vibration-damping viscoelastic material ls investigated. Measurements of relative amplitudes and phase lag between the free arid driven ends of the beam were used to characterize the variation of the viscoelastic material's complex Young's modulus with frequency. Effects of other parameters such as temperature or humidity on the complex modulus can be evaluated provided that tests are done in an environmental chamber. The method is readily applicable to beams with coatings of viscoelastic material of equal thickness on both sides and also to any beam manufactured out of a single, self-supporting material. It is efficient, fast and accurate. It is a valuable alternative to the ASTM E756-83 "Standard Method for Measuring Vibration – Damping Properties of Materials.”

Description

The motion of a root-excited cantilever beam coated on both sides with a vibration-damping viscoelastic material ls investigated. Measurements of relative amplitudes and phase lag between the free arid driven ends of the beam were used to characterize the variation of the viscoelastic material's complex Young's modulus with frequency. Effects of other parameters such as temperature or humidity on the complex modulus can be evaluated provided that tests are done in an environmental chamber. The method is readily applicable to beams with coatings of viscoelastic material of equal thickness on both sides and also to any beam manufactured out of a single, self-supporting material. It is efficient, fast and accurate. It is a valuable alternative to the ASTM E756-83 "Standard Method for Measuring Vibration – Damping Properties of Materials.”

Distribution Classification

1

Distribution Conflict

No

DTIC Record Exists

No

Illinois Tech Related

No

Photo Quality

Not Needed

Report Availability

Full text available

Type

article

Is Part Of

Proceedings of Damping '91: 13-15 February 1991 San Diego, California (Pages AAC-1 through DCC-19)