Measurement of the Modulus and Yield Strength of Soft Gels: Experiments and Numerical Simulation
作者:
Karen Goodrich,
Ann Yoshimura,
Robert K. Prud'homme,
期刊:
Journal of Rheology
(AIP Available online 1989)
卷期:
Volume 33,
issue 2
页码: 317-327
ISSN:0148-6055
年代: 1989
DOI:10.1122/1.550016
出版商: The Society of Rheology
数据来源: AIP
摘要:
An apparatus is described which permits the measurement of the modulus and yield strength of gels. The device consists of a cylindrical cell with internal fins to prevent slip of the gel at the cell walls. Pressure is applied to the cell and the volume of displaced gel is measured. A numerical finite‐element simulation of gel deformation yields a proportionality constant relating pressure and displaced volume. The simulation has been run for a wide range of geometries. Model polyacrylamide gels were made having moduli from 1,500 to 9,620 Pa as measured by a rheometer. The moduli values calculated from the test cell data using the finite‐element simulation were on average 6.1% lower than the values measured by the rheometer. The adaptation of the cell to measuring gel properties at elevated temperatures and pressures is discussed.
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