# Stress Analysis Module

Deformation of stator in fundamental oscillating mode

The Stress solver can solve for static stresses in 2 or 3 dimensions. Results include deformations, strains and stresses.

In 3 dimensions it can also be used to calculate the natural modes of the structure ie. the eigenvalues and eigenvectors.

3d Stress analysis can analyse isotropic and anisotropic (orthotropic) and fully anisotropic materials. It uses the following material properties:
• Young’s modulus
• Poisson’s ratio
• Shear modulus
• Elasticity matrix (fully anisotropic materials)
• Thermal expansion coefficients (Static Stress only)
• General expansion integrals (Static Stress only)
• Density (Static Stress only)
The material properties can be specified as numeric values or as expressions. For example, the thermal expansion coefficients could be functions of temperature or position.

Synchronous Reluctance Machine deformation under load

In the 3d Static Stress solver, external forces and constraints can be applied globally or as boundary conditions on the surfaces of the model. The available forces are:
• pressure, a force normal to the surface, and
• traction, a force in any direction.
The available constraints are:
• fixed:
– fixed in all 3 directions;
– fixed in tangential directions;
– fixed in the direction normal to the surface;
• defined normal displacement;
• defined displacement in all 3 directions;
• thermal expansion, with values of reference and operating temperatures, which can be imported from thermal analysis, and
• general expansion, which can be used to model magnetostriction, electrostriction and piezo effects, with the expansion integrals expressed as functions of magnetic or electric field vectors imported from electromagnetic analysis.