## FEEA SDK™ Features

### Available analysis procedures

With Anaxsoft FEEA SDK™ you can perform the following analysis procedures:

- Static
- Transient implicit (Newmark, Wilson-θ Method)
- Transient explicit (Central Difference Method)
- Mode-Frequency (eigenvalue extraction)
- Time history by mode superposition
- Harmonic vibration
- Response spectrum
- Cross-section properties calculation (torsional/warping constants, etc)

### Degrees of Freedom – Coordinate Systems

It handles in a very efficient manner the degrees of freedom assigned at nodes, and the skew coordinate systems assigned at the degrees of freedom. Uses up to six degrees of freedom per node: three translational and three rotational degrees of freedom. Each node's degrees of freedom may be assigned to skew coordinate systems. Specifically, with our engine you can:

- Use master boundary condition codes (master degrees of freedom)
- Have variable (1 to 6) degrees of freedom per node
- Support unlimited number of coordinate systems
- Define nodes in coordinate systems other than the global Cartesian
- Assign skew coordinate system to nodes

### Material models

The following material models are supported:

- Elastic-isotropic
- Elastic-orthotropic

### Element library – Element formulations

It offers a rich set of elements/element formulations. The following element formulations are available:

- 2-node truss element
- 2-node prismatic beam element (includes shearing deformation effects – Timoshenko beam)
- Variable 3- to 6-node 2-D solid isoparametric triangular element
- Variable 4- to 9-node 2-D solid isoparametric quadrilateral element
- Variable 4- to 10-node 3-D solid isoparametric tetrahedral element
- Variable 8- to 20-node or 21- or 27-node 3-D solid isoparametric hexahedral element
- Single degree of freedom spring element
- Single degree of freedom mass element
- Single degree of freedom damper element
- Rigid link element (between two nodes)
- Rigid body (variable node element)

### Two-dimensional elements kinematic assumptions

The following kinematic assumptions, when dealing with two-dimensional problems, are handled:

- Plane stress
- Plane strain
- Axisymmetric

### Boundary conditions

The following boundary conditions are available:

- Fixity boundary conditions
- Prescribed displacements at specified degrees of freedom
- Single-point constraint equations
- Multi-point constraint equations
- Initial conditions (displacements/velocities/accelerations)

### Applied Loading

The following loads are available:

- Force and moment load applied at node
- Pressure load applied at 2-D solid element edges
- Pressure load applied at 3-D solid element surfaces
- Pressure load applied at plate/shell element surfaces
- Mass-proportional load to model gravity loading or ground acceleration
- Concentrated force/moment applied at truss/beam element
- Distributed load (applied at truss/beam element)
- Trapezoidal load applied partially at beam element
- Fixed-end forces to simulate arbitrary load applied at beam element
- Prescribed temperature load

### Mass Formulation

It supports the following mass-matrix formulations:

- Lumped
- Consistent

### Damping

The following damping options are available:

- Modal damping
- Reyleigh damping

### Additional Capabilities

Anaxsoft FEEA SDK has unique capabillities. Specifically, for linear analysis, it allows:

- Multiple analysis procedures in a single computer run
- Results to be obtained for selected nodes/elements

For example, in a single run, you can perform any number of linear static or dynamic analyses.

### No restrictions

Anaxsoft FEEA SDK does not impose any restrictions, other than those imposed by computer's physical memory. It has been successfully tested with models having 100K-200K degrees of freedom. You can have unlimited entities, like:

- Nodes, elements, element groups, etc.
- Loading cases/loading case combinations (linear static analysis)
- Time functions
- Time history loading cases (each associated with a time function)
- Response spectra