Question 1, check the stress and strain in the post-processor after analyzing the results. It belongs to output, view and question. I don't quite understand what you said about the specified stress-strain relationship. For example:

etable，mforx，smisc， 1！ Establish the results table of axial force of bar element (note, the same below)

etable，saxl，ls， 1！ The axial stress result table of bar element is established.

etable，epelaxl，lepel， 1！ The axial strain result table of rod element is established.

Question 2: Different units can give different Young's modulus and Poisson's ratio.

For example, (by way of example only)

et， 1，beam 188！ Define the first type of unit.

et，2，plane42！ Define the second type of unit.

mp，ex， 1，2e 1 1！ Definition of Young's Modulus of the First Kind

mp，ex，2，2.5e 1 1！ Define the second Young's modulus

mp，prxy， 1，0.3！ Define Poisson's ratio of the first kind.

mp，prxy，2，0.28！ Define Poisson's ratio of the second kind

Type, 1

mat， 1

Then model, add constraints, add forces, and divide the grid.

! Under the first kind of element and material characteristics, modeling, constraint, stress and mesh division are carried out.

Type, 2

Cushion, 2

Then model, add constraints, add forces, and divide the grid.

! Under the second kind of element and material characteristics, modeling, constraint, stress and mesh division are carried out.

Finally, solve and check the results.

Is to specify material properties before meshing.