Correlation of Complex Modulus Data by Direct Stiffness and Indirect Resonant Beam Techniques
Report Number: WL-TR-91-3078 Volume II, pages EBB-1 to EBB-16
Author(s): Jones, David I. G., Khouri, Mona, Lewis, Tom
Corporate Author(s): Flight Dynamics Laboratory, DCAN Toulon, Anatrol Corporation
Laboratory: Wright Laboratory
Date of Publication: 1991-08
Pages: 16
DoD Project: 2401
DoD Task: 240104
Identifier: This paper is part of a conference proceedings. See ADA241312
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.
Provenance: University of Colorado Colorado Springs, Kraemer Family Library
Author(s): Jones, David I. G., Khouri, Mona, Lewis, Tom
Corporate Author(s): Flight Dynamics Laboratory, DCAN Toulon, Anatrol Corporation
Laboratory: Wright Laboratory
Date of Publication: 1991-08
Pages: 16
DoD Project: 2401
DoD Task: 240104
Identifier: This paper is part of a conference proceedings. See ADA241312
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.
Provenance: University of Colorado Colorado Springs, Kraemer Family Library
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This report is part of the following conference:
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Proceedings of Damping '91: 13-15 February 1991 San Diego, California (EAA-1 through GBC-16)
WL-TR-91-3078 Volume II