Abstract
The Giesekus design of Taylor's four-roll mill has been restored and is here used in novel flow visualizations of both pulsating and monotonously increasing strains. The particle movement paths and progressive deformation patterns visualized in these physical experiments are in agreement with those previously calculated analytically and constructed graphically. The progressive deformation of passive material markers is guided by flowlines. Circular flowlines accommodate rigid-body rotations without deformation. Elliptical flowlines result in pulsating strains. The maximum strain occurs when material particles, which were initially at the short axis of the elliptical flowlines, reach the long axis of the flow patterns. Monotonically increasing strains occur when flowlines are hyperbolic. The insight thus gained is extrapolated to suggest practical methods and assumptions that allow the reconstruction of particle movement paths from deformation features commonly observed in rocks.
| Original language | English |
|---|---|
| Pages (from-to) | 77-92 |
| Number of pages | 16 |
| Journal | Journal of Structural Geology |
| Volume | 20 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 1998 |
Bibliographical note
Funding Information:Acknowledgements~This work was supported by research grant ES/ TRANS/154 of King Fahd University of Petroleum and Minerals. Professor Hans Giesekus provided generous help, hospitality and scientific encouragements at the University of Dortmund, January 1990. Refurbishment of the Giesekus design of the Taylor mill was accomplished at the Hans Ramberg Tectonic Laboratory, University of Uppsala, in 1991. Flow visualizations were photographed in 1992. Slides of the flow were presented at the Penrose conference on strain, Halifax, Nova Scotia, September 1993.T echnical support was provided by Bertel GiBs and Einar Meland, and funded by grants from the Swedish Natural Science Research Council (NFR).
ASJC Scopus subject areas
- Geology