**process extensometer

Description

This post computes a virtual extensometer between two points, i.e.:

\[strain = \frac{L-L_0}{L_0}\]

Syntax

**process extensometer \(~\,\) *p0 vector \(~\,\) *p1 vector [ *tolerance value ] [ *locator_type locator ]

*p0, *p1

are the two ends of the extensometer.

*tolerance

is passed to the element locator, to allow slightly out-of-elements point localization. Default is \(10^{-12}\) (the value of tiny displacement, see ***dimension ).

*locator_type

is the localization method. It defaults to bb_tree (currently the optimal method available in Z-set).

Example

The following example is taken from Post_test/INP/extensometer.inp

****post_processing
 ***global_post_processing
  **file node
  **process extensometer
   *p0 (0. 0. 0.)
   *p1 (1. 0. 0.)
  **process extensometer
   *p0 (0. 0. 0.)
   *p1 (1. 1. 0.)
****return