1) Click on the Jobs tab and then click on New - Structural.
2) Then, enter Name: as nonlinear_job1 and then click on Properties.
3) Under Available, select my_nonlinear.
4) Then, click on Initial Loads.
5) Deselect the Initial Loads in Boundary Conditions and click OK.
6) Under Analysis Dimension, click on Plane Stress, make sure Linear Elastic Analysis is unchecked and then click on Analysis Options.
7) Select Large Strain and then click OK and OK.
1) Close the existing results.
2) Delete the existing mesh.
3) Create a new mesh that has the same number of elements lengthwise but has two elements over the height of the beam.
4) Run both linear and nonlinear jobs again.
5) Open the results file and make Results plots as before and compare the Y-displacements with the ones obtained with the coarser (8 x 1) mesh, and the theoretical values.
As shown in the results obtained, inclusion of large deformation effects are very important in realistically modeling the physical behavior of the cantilever model.
MARC Results at Various Mesh Densities:
Notice the amount of error as a result of using the Standard formulation Plane-Stress Element, without tuning on the Assumed Strain Parameter. This inaccuracy is due to the shear-locking of the element. The Assumed Strain and Reduced Integration options correct for this inaccuracy. By Default, the Assumed Strain Parameter is turned OFF. Turn this option on when using Standard Integration Plane Strain, Plane Stress, or Hex Elements. (Element Types 3, 7, and 11)