Look through the input file and try to identify places where units might be relevant.

There are four lines in the input file:

  1. Two lines for the physical mesh dimension (xmax and ymax)

  2. One lines for the Young's modulus

  3. One line for the time step dt

Note that the Poisson's ratio is unitless.

So what are the chosen units here? It is up to the author of the input file to decide that, as long as the units of the supplied parameters are consistent.

Let's start with the Young's modulus and say its units are Pa. Pascal is an SI derived unit for pressure and is equivalent to . From that the consistent time and length units follow immediately. The mesh dimensions 1 x 2 must have the unit meters, the time must be specified in seconds.

commentnote

MOOSE provides a system to convert quantities between units right in the input file. A list of supported units can be found here. Try using youngs_modulus = ${units 145037.74 lbs/in^2 -> Pa} in the input file, for an explicit conversion from pounds per square inch to Pascal.