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type, title, created, updated, address, aliases, tags, status, related, sources
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| concept | Midas NFX Element Library | 2026-06-02 | 2026-06-02 | c-000175 |
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Midas NFX Element Library
Definition
The NFX element library is the collection of structural, field, rigid, interpolation, and joint element formulations documented in the Midas-NFX-Analysis-Manual.
Structural Coverage
The library includes scalar spring/mass/damper elements; one-dimensional rod, embedded rod, bar, embedded bar, pipe, cable, bush, and gap elements; two-dimensional membrane, shell, surface, plane strain, and axisymmetric solid elements; and three-dimensional solid, layered shell, and layered solid elements. The manual also covers geometric stiffness for rods, bars, pipes, membranes, shells, axisymmetric solids, solids, springs, bushes, rigid elements, and contact conditions.
Formulation Details
The manual starts from variational finite element formulations and shape functions, then describes element-local coordinates, material/result coordinate systems, DOFs, stress/strain/result locations, integration choices, stabilization, reduced integration, assumed natural strain behavior, hybrid variants, drilling DOFs, offsets, and through-thickness integration. Shell elements are especially explicit: membrane forces, bending moments, transverse shear forces, top/bottom/center result locations, director vectors, and optional 5-DOF or 6-DOF behavior are treated as separate implementation choices.
Field Elements
NFX thermal elements reuse the structural mesh topology but switch nodal DOFs to temperature and produce heat flux and thermal-gradient output. Joule heating adds electric potential as a coupled field, current-density results, electric potential gradients, and nonsymmetric coupled matrices.
Solver Development Use
For a custom solver, this page separates element taxonomy from element implementation. Each element family should specify interpolation, DOF set, local coordinate system, integration rule, stiffness/mass/capacitance contributions, geometric stiffness availability, load conversion, result recovery, and nonlinear-state support.
Connections
- Isoparametric Finite Elements gives the shared interpolation framework.
- Abaqus Element Library provides a broad commercial element-family comparison.
- Midas FEA Element Library and Midas Civil Element Library and Section Stiffness are sibling MIDAS element references.