Strain analysis methodologies - Rf/f method

  • For each deformed object, define the approximate ellipse by:

1. measuring the long axis length;

2. measuring the (orthogonal) short axis length;

3. calculate the axial ratio (Rf = long/short);

4. measure the orientation f of the long axis relative to a fixed reference direction.

Orientations

  • Plot the pairs of values of Rf and f on a graph.
  • Standard graphs are available which are contoured for values of initially ellipticity of the ellipses (Ri).
  • Compare the data with the standards using the 50% split line to help: the orientation of the long axis of the ellipse is obtained by referring the maximum value of f to your reference direction.
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    Introduction Day 1 Day 2
    Day 3 Day 4 Day 5

    Last update: 29th January 2002
    Copyright © Dr G. Lloyd, School of Earth Sciences, Leeds University, 2002