Title: COMPACTION CURVES REVISITED

Abstract:
Compaction curves have long been used as a simple tool for characterizing compaction. However, their utility and significance has recently been called Into doubt. In probing Compaction using In-situ X-ray computed tomograpy we chow to compare single-sided compaction behavior to the internal density changes. In many' cases, density ,gradient formation was very localized suggesting a lass generalized compaction than that implicit to the classical model. A 2D distinct-element approach was then used to similate the densification behavior of Gene. spry-dried powders during compaction. Both the 'density and the compaction Curves produced by this simulation follow the same trend as the experimental data at specific levels of humidity. These combined results suggest that Stage I compaction is cause by rearrangement of the top layer of agglomerates, Stage II by the grows of high density zones into the remaining bulk, and Stage III by the elastic response of these existing gradients once the opposing surface has been encountered.
(Ref. SXVIII-035-97)

Source: NDE of Ceramics '97 May 4-7, Symposium on Nondestructive Evaluation of Ceramics at the American Ceramic Society 99th Annual Meeting, Cincinnati, Ohio.
Buying the Symposium Proceedings from the American Ceramic Society.