# OOF: Finite Element Analysis of Microstructures

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#

The Drawers

When a Drawer is first opened, the **Mesh Drawer** will be
displayed. The Mesh Drawer displays the finite element mesh, with the
elements colored according to their gray value (see Chapter
4). Elements and nodes can be selected in the Mesh
Drawer.

The rest of the drawers color the elements according to the local stress and strain. See Section 5.2.3 to interpret and control the color scheme.

The Drawers **Stress XX**, **Stress YY**, **Stress ZZ**, **Stress XY**, **Stress XZ**, and **Stress YZ** display the Cartesian
components of the Stress (*i.e,* the stress in the screen
coordinate system.)

The Drawer **Stress invariant 1** displays the first invariant (the
trace) of the stress,
, which
is the pressure. The Drawer **Stress invariant 2** displays the
second invariant,

(5.1) |

The Drawer **Stress invariant 3** displays the third invariant, or
determinant, of the stress tensor.

The Drawers **Stress principal 1**, **Stress principal 2**, and
**Stress principal 3** display the largest (1), middle (2) and
smallest (3) eigenvalues of the stress.

The Drawer **Shear Stress** draws the invariant shear stress, which
is one half the difference between the maximum and minimum eigenvalues
of the stress.

Each of the above-mentioned **Stress** Drawers has a corresponding
**Strain** Drawer.

The Drawer **Energy Density** draws the elastic energy density.

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