Combined Loading Theory

1. Draw a FBD of the post cut at the gage location.  Therefore,

   

   where

   

   and

   

   
   
2. Now we can plot experimental and theoretical lines on the same graph:

   

3. The location of the experimental N.A. is determined from

   

   so that

   

   Likewise, the location of the theoretical N.A. is given by

   

4. We can also compare

   

   and