Correlation of Complex Modulus Data by Direct Stiffness and Indirect Resonant Beam Techniques

Item

Title
Correlation of Complex Modulus Data by Direct Stiffness and Indirect Resonant Beam Techniques
Description
Complex modulus data as a function of frequency and temperature for a typical viscoelastic polymer (SNPE Nepurane) have been measured by a direct stiffness technique and by means of the ASTM standard resonant sandwich beam technique. Systematic differences between the two data sets are noted at high values of the damping material shear modulus, at low temperatures. These differences are accounted for through the finite stiffness of the measurement system. Estimates of this stiffness are obtained, which are of the same order of magnitude as those for commercial force gages, and a simple correction is evaluated. The implications from the point of view of obtaining valid data in the glassy region of a polymeric material are discussed.
Creator
Jones, David I. G.
Khouri, Mona
Lewis, Tom
Publisher
Wright-Patterson Air Force Base, OH : Wright Laboratory, Flight Dynamics Directorate, Air Force Systems Command
Date
1991
Format
1 online resource (16 pages) : ill.
Type
article
Abstract
Complex modulus data as a function of frequency and temperature for a typical viscoelastic polymer (SNPE Nepurane) have been measured by a direct stiffness technique and by means of the ASTM standard resonant sandwich beam technique. Systematic differences between the two data sets are noted at high values of the damping material shear modulus, at low temperatures. These differences are accounted for through the finite stiffness of the measurement system. Estimates of this stiffness are obtained, which are of the same order of magnitude as those for commercial force gages, and a simple correction is evaluated. The implications from the point of view of obtaining valid data in the glassy region of a polymeric material are discussed.
Date Issued
1991-08
Extent
16
Corporate Author
Flight Dynamics Laboratory
DCAN Toulon
Anatrol Corporation
Laboratory
Wright Laboratory
Report Number
WL-TR-91-3078 Volume II, pages EBB-1 to EBB-16
DoD Project
2401
DoD Task
240104
Distribution Conflict
No
Index Abstract
Contrails only
Photo Quality
Not Needed
Distribution Classification
1
Report Availability
Full text available
Provenance
University of Colorado Colorado Springs, Kraemer Family Library
Identifier
ADA241312
Is Part Of
Proceedings of Damping '91: 13-15 February 1991 San Diego, California (EAA-1 through GBC-16)
Media
WLTR91-3078volume02articleEBB.pdf

Linked resources

Items with "Has Part: Correlation of Complex Modulus Data by Direct Stiffness and Indirect Resonant Beam Techniques"
Title Class
Proceedings of Damping '91: 13-15 February 1991 San Diego, California (EAA-1 through GBC-16)