In my previous article, I had discussed about the AEM program for linear 2D materials that I had written in Python. Although, poisson's ratio was not considered in that program, I found that when elements are compressed (or stretched) diagonally, an intrinsic poisson effect is induced. However, such poisson effect is non existent when elements are compressed (or stretched) orthogonally. This is mainly because when the elements are compressed diagonally, the diagonal displacement induces extra force on the two lateral elements as shown in figure 1.

Note: Element properties used in all of the simulations presented here are:

Young's Modulus (E) = 207 GPa

Shear Modulus (G) = 79.1 GPa

Element Dimension (a by b) = 0.1 m by 0.1 m

Element Thickness (T) = 0.15 m

Load (L) = 1000 kN [each red arrows]

Also in all of the figures presented here, green squares represent undeformed elements and blue squares represent deformed elements. Displacements are magnified 500 times.