Abstract
An experimental apparatus is described for use in determination of the strain recovery in compacts. The basic principle of the apparatus is the production of Fraunhofer diffraction fringes by two orthogonal slits formed between fixed edges and the edges of the compact, which permit small changes (∼ 5×10−5 m) in compact dimensions to be continuously monitored. One of the important advantages of the method is that it prodives a non-contact measurement and thus avoids damage to the compact surface which can arise through the use of micrometers, callipers or mechanical transducers. The whole apparatus, excluding the light source, may be fitted into an environmentally controlled cabinet, thus permitting temperature, humidity, etc. to be varied. Results are presented for the use of the apparatus in studying the strain recovery of methyl cellulose compacts.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
M. E. Aulton, D. N. Travers and P. J. P. White, J. Pharm. Pharmac. 25 Suppl. (1973) 79P.
D. N. Travers, P. J. P. White and C. J. Lewis, ibid 24 Suppl. (1971) 57P.
R. M. Goldhoff, “Advances in Creep Design”, 1st Edn. (Applied Science Publishers, London, 1971) p. 103.
A. V. Tobolsky, J. Polymer Sci. C 9 (1965) 157.
M. Baba and N. Nagafuji, Ann. Rep. Shionogi Res. Lab. 15 (1965) 147.
F. G. Smith and J. H. Thompson, “Optics” (Wiley, London, 1973).
J. Topping, “Errors of Observation and their Treatment” (Chapman and Hall, London, 1955).
P. York and E. D. Baily, to be published.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Baily, E.D., York, P. An apparatus for the study of strain recovery in compacts. J Mater Sci 11, 1470–1474 (1976). https://doi.org/10.1007/BF00540880
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00540880