NDLI: Comparison of bulk modulus determined by transient bulk creep experiment and direct optical measurement of poisson’s ratio

Content Provider	IEEE Xplore Digital Library
Author	Low, R. Wilde, J.
Copyright Year	2008
Description	Author affiliation: Corp. Sector Res. & Adv. Eng., Robert Bosch GmbH, Waiblingen (Low, R.)
Abstract	This work presents a method to determine the bulk modulus and Poisson's ratio of an epoxy. Since either Poisson's ratio or bulk modulus is needed for a full description of the materials constitutive behaviour, both methods were compared to identify the more appropriate one. Poisson's ratio was obtained using an optical imaging system. The experimental setup consists of multiple cameras that measure the elongation and the lateral strain of a sample at tension load for different temperatures, ranging from -40degC up to 150degC. Bulk modulus was measured using transient bulk creep experiments. These were carried out using a pVT dilatometer. A pressure jump was applied to a constant level and pressure remained steady up to four days. Therefore, relaxation in the volume did occur. The pressure jump experiments were performed at different temperatures. The final pressure was 200 MPa and temperature ranges from 30degC to 150degC. The results indicate clearly, that there is a time and temperature dependency of the bulk modulus for the adhesive used. Poisson's ratio was computed and compared to the one from the direct optical measurement. Moreover, a time- temperature shift was done and data were fitted to Prony series. Viscoelastic data was implemented in a commercial finite element (FE) program.
Starting Page	1
Ending Page	6
File Size	1485949
Page Count	6
File Format	PDF
ISBN	9781424421275
DOI	10.1109/ESIME.2008.4525035
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-04-20
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Creep Strain measurement Temperature distribution Optical materials Optical imaging Cameras Volume relaxation Temperature dependence Optical computing Viscosity
Content Type	Text
Resource Type	Article

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