This source is the analysis manual for midas NFX, a general-purpose finite element analysis product from MIDAS Information Technology. The raw manual covers the analysis model, node degrees of freedom, coordinate systems, finite rotations, structural element formulations, material models, equation solvers, eigen extraction, dynamic response, nonlinear algorithms, contact, fatigue, optimization, forming-limit checks, and thermal/electrical field analysis.
The manual is useful in this vault because it bridges the two existing MIDAS references. Midas-FEA-Analysis-Manual emphasizes civil nonlinear detail analysis, while Midas-Civil-Analysis-Reference emphasizes bridge and civil workflows. The NFX manual is broader and more solver-kernel oriented: it names the structural analysis cases, describes file contracts, gives element and material coverage, and exposes algorithm choices such as sparse direct solution, AMG iteration, Lanczos extraction, HHT integration, explicit central difference, penalty contact, fatigue damage, and topology optimization.
Extracted Threads
Midas NFX Analysis Workflow - model definition, analysis case selection, solve, and postprocessing file/result contract.
Midas NFX Element Library - scalar, rod, bar, pipe, cable, membrane, shell, surface, plane strain, axisymmetric, solid, layered, thermal, electrical, rigid, interpolation, and joint elements.
Midas NFX Material and Composite Models - elastic, nonlinear elastic, plastic, hyperelastic, thermal, viscoelastic, laminated composite, and composite failure models.
Midas NFX Nonlinear Static and Dynamic Algorithms - Newton iteration, line search, large-strain stress recovery, explicit/implicit transient integration, critical time step, damping, and mass scaling.
Midas NFX Contact Analysis - general, rough, welded, sliding, mortar, single-surface, node-to-surface, surface-to-surface, penalty, friction, and breaking-weld contact.
Midas NFX Fatigue Analysis - stress-life, strain-life, rainflow counting, Miner damage, mean-stress correction, and random vibration fatigue.
For custom solver development, this source is a production requirements checklist for a general-purpose FE kernel. It highlights contracts that must be nailed down before implementation: nodal DOF sets, local/global/material/result coordinate systems, element formulation coordinate systems, file formats, element result locations, solver selection logic, mode normalization, time-integration controls, contact enforcement, fatigue postprocessing, and optimization response definitions.
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