Material Commands

Like many finite element applications, all nonlinear elements have associated with them a material. It is the material in conjunction with the element geometry that provides the force-displacement response of the element. In OpenSees materials are divided into three general types:

1. uniaxial materials which define a uniaxial (1 dimensional) stress-strain relationship.

2. nDimensional materials which define multi-dimensional (plane stress, plane strain, or 3d) stress-strain relationships.

3. sections which define coupled moment-curvature and axial-deformation relationships for beam column elements.

OpenSees Materials

• 3.1.5. uniaxialMaterial Command
• 3.1.6. nDMaterial Command

For simple investigation of material/section behavior, try the built-in material testing commands.

• Material Testing Commands