김경종
62 lines
3.1 KiB
Markdown
62 lines
3.1 KiB
Markdown
---
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type: concept
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title: "Midas NFX Element Library"
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created: 2026-06-02
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updated: 2026-06-02
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address: c-000175
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aliases:
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- NFX element library
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tags:
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- concept
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- finite-element-method
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- midas-nfx
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- elements
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status: current
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related:
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- "[[Midas-NFX-Analysis-Manual|Midas NFX Analysis Manual]]"
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- "[[midas NFX]]"
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- "[[Isoparametric Finite Elements]]"
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- "[[Abaqus Element Library]]"
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- "[[Midas FEA Element Library]]"
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- "[[Midas Civil Element Library and Section Stiffness]]"
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sources:
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- "[[Midas-NFX-Analysis-Manual|Midas NFX Analysis Manual]]"
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source_refs:
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- source: "[[Midas-NFX-Analysis-Manual|Midas NFX Analysis Manual]]"
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raw_path: ".raw/MidasNFXAnalysisManual/"
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raw_files:
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- "MidasNFXAnalysisManual_001.md"
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md_indices:
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- 1
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match: "heuristic-heading-keyword"
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confidence: low
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---
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# Midas NFX Element Library
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## Definition
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The NFX element library is the collection of structural, field, rigid, interpolation, and joint element formulations documented in the [[Midas-NFX-Analysis-Manual|Midas NFX Analysis Manual]].
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## Structural Coverage
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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.
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## Formulation Details
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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.
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## Field Elements
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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.
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## Solver Development Use
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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.
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## Connections
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- [[Isoparametric Finite Elements]] gives the shared interpolation framework.
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- [[Abaqus Element Library]] provides a broad commercial element-family comparison.
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- [[Midas FEA Element Library]] and [[Midas Civil Element Library and Section Stiffness]] are sibling MIDAS element references.
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