Compression stress relaxation apparatus for the long-time monitoring of the incremental modulus

Horst, Roland H., Stephens, Thomas S., Coons, James E. and Winter, H. Henning (2003) Compression stress relaxation apparatus for the long-time monitoring of the incremental modulus. Review of Scientific Instruments, 74 11: 4737-4744. doi:10.1063/1.1611617

Author Horst, Roland H.
Stephens, Thomas S.
Coons, James E.
Winter, H. Henning
Title Compression stress relaxation apparatus for the long-time monitoring of the incremental modulus
Journal name Review of Scientific Instruments   Check publisher's open access policy
ISSN 0034-6748
Publication date 2003
Sub-type Article (original research)
DOI 10.1063/1.1611617
Volume 74
Issue 11
Start page 4737
End page 4744
Total pages 8
Place of publication New York, USA
Publisher American Institute of Physics
Language eng
Subject 0304 Medicinal and Biomolecular Chemistry
0915 Interdisciplinary Engineering
0299 Other Physical Sciences
Abstract A compression apparatus for aging experiments on soft rubbers and foams is presented. The sample is compressed between two parallel surfaces and held there for long-time relaxation studies. The specific purpose of the test is twofold: possible exposure of the sample to aggressive environment under compression during aging and measurement of sample modulus without unloading, i.e., while leaving the sample under constant compression at all times. To determine the restoring force in the compressed sample, the compression strain is modulated with an incremental strain while measuring the force response. The total force gives the compression modulus, and the slope of the force-strain curve allows the determination of the incremental modulus. Stress relaxation data for silicon foam, Dow Corning S-5370 RTV, with 68% void fraction are shown. The modulus of the compressed sample decays over long experimental times of several days. The decay can be described by two relaxation modes, a short mode at 1500 s and a long mode at about 105 s. The incremental modulus changes sharply in the first 1000 s (first mode) and then levels off. The apparatus consists of two self-contained components, the removable sample holder (compression jig) and the stationary test station, which performs the modulation of the strain and all measurements (restoring force and incremental modulus). This allows separation of functions. The apparatus design specifically focused on the control of the incremental strain modulation. © 2003 American Institute of Physics.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown
Additional Notes Article number: 4737

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Chemical Engineering Publications
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Citation counts: TR Web of Science Citation Count  Cited 6 times in Thomson Reuters Web of Science Article | Citations
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Created: Mon, 24 Apr 2006, 22:38:14 EST