Accession Number:

AD0752483

Title:

Determining the Dynamic Bulk Modulus and the Elastic-Loss Factor of Polymers from Acoustic Measurements

Descriptive Note:

Corporate Author:

DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD SHIP ACOUSTICS DEPT

Personal Author(s):

• Niemiec, Jan M.

Report Date:

1972-10-01

Pagination or Media Count:

22.0

Abstract:

A dynamic measurement technique is presented for determining the bulk modulus and the associated-loss factor of elastomeric and plastic materials. A resonant water column is used from which stiffness and damping are determined by the resonance frequency and the bandwidth of its resonance curve. A SAMPLE IS INSERTED INTO THE WATER COLUMN AT A PRESSURE MAXIMUM, AND THE RESONANCE FREQUENCY AND THE BANDWIDTH OF THE SYSTEM ARE MEASURED. The difference in the resonance frequency and the bandwidth of the water column without and with the sample present is then used to calculate the real component of the bulk modulus and the loss factor of the sample. Experimental results for various materials are presented which verify the theory.

Descriptors:

• *ELASTOMERS
• *PLASTICS
• MECHANICAL PROPERTIES
• POLYMERS
• FREQUENCY SHIFT
• RESONANT FREQUENCY
• TEST METHODS
• ELASTIC PROPERTIES

Subject Categories:

• Plastics
• Elastomers and Rubber

Distribution Statement:

APPROVED FOR PUBLIC RELEASE