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
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| Title | Class |
|---|---|
| Proceedings of Damping '91: 13-15 February 1991 San Diego, California (EAA-1 through GBC-16) |