NEi Software Nastran Finite Element Analysis

Nastran Finite Element Analysis and Simulation Software

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Analysis with NEi Fusion

NEi Fusion's capabilities can bring engineering insight to your design process and help you spot problem areas, optimize performance, and virtually test before building expensive prototypes and fixtures. In short, you can save time and money while building more innovative, higher quality products.

Linear Statics

Linear statics is one of the most common types of analyses needed by design engineers. You apply loads and constraints to your parametric part and the NEi Nastran solver provides results which can be displayed in a wide variety of formats showing stress, strain, and deformation.

Linear Steady State Heat Transfer

Using the principles of conduction and convection heat transfer, engineers can examine designs for equilibrium temperature distribution.

Normal Modes

Determines the undamped natural mode shapes and frequencies of structures allowing designers to explore and resolve problems with noise and vibration.


Allows designers to examine structures for sudden failure modes caused by compressive forces.


Allows the user to induce an initial stress state on structures such as rotor blades or taut strings.

Assembly Modeling with Contact

NEi Fusion allows designers to go beyond analyzing individual parts. Assemblies with different kinds of contact can be modeled including sliding, friction, and welded, allowing simulations to attain real world fidelity. This sophisticated nonlinear modeling capability is typically an expensive add-on to most solvers, but with NEi Fusion, it comes standard.


In addition to a library of materials, NEi Fusion contains a suite of tools designed to bring engineering insight to the analysis of composites and laminated products. These tools help make the process straightforward and less time consuming.

  • Clear, easy input of strength and stiffness terms with access to material libraries
  • Ply lay-up definition, in which stacking sequences can be easily entered and modified, and symmetry can be used to reduce entries
  • Easy orientation definition created by projecting a cylindrical or spherical coordinate system onto a structure to improve ply orientation
  • Laminate property support for both 2D shell elements and 3D layered solid elements
  • Post-processing visualizations that pinpoint problems at the ply level and logical paths from stress analysis of a structure to failure index results
  • Support for advanced failure criteria including the most modern forms of Puck and NASA Langley LaRC02, as well as strength ratios for easy linear scaling and qualitative analysis
  • Simple Material Property and Layup Editors that allow easy composite ply definition while providing advanced features for material property entry

Nonlinear Static and Nonlinear Transient Response

Allows material nonlinearity (material stress-strain data), contact (opening and closing of gaps and sliding), and large displacement and rotation (large deflection) effects to be captured in analysis models. Additionally, transient and inertia effects can be included.

Transient Response

Used to determine the response of a structure through a period of time under the influence of constant or time-dependent loads. Dynamic situations such as impulse loading can be modeled.

Frequency Response

Determines the structural harmonic response based upon frequency-dependent loads or enforced motions such as displacements, velocities, or accelerations.

Nonlinear Steady State Heat Transfer

Finds the steady-state solution to heat transfer models involving radiation, temperature dependent material properties, or other thermal boundary conditions such as convection or heat generation.

Nonlinear Transient Heat Transfer

Nonlinear thermal boundary conditions can vary through time. Thermal pulsations in exhaust systems and power fluctuations upon microchips can be modeled.

Automated Impact Analysis (AIA™)

Ideal for performing projectile impacts and virtual drop tests, AIA provides an excellent introduction to the power that automated tools can bring to demanding simulation problems. AIA takes a very complex, time-consuming simulation task and simplifies and automates it. AIA requires a minimum of input data for the analysis — projectile velocity and acceleration. AIA determines the time steps, duration, and complex contact interaction between projectile and target. AIA can provide a thorough and physically realistic simulation of impact because of this comprehensive treatment of the phenomenon. This is much more useful and meaningful from an engineering standpoint than a simplistic imposition of force at a point found in other impact or drop tests providing insight into dynamic, implicit, nonlinear behavior or real world impact problems.



  • Full single-window integration between solid modeling and analysis
  • Full support of Windows® functions such as drag-and-drop, point-and-click, and cut-and-paste
  • Dynamic viewing (zoom, pan, rotate, sectioning) by mouse or advanced 3D pointing devices
  • Toolbars for fast access to main functionality
  • Flexible model coloring and transparency control (parts, assemblies, single or groups of faces, etc.)
  • Direct use of CAD geometry for analysis
  • Direct application of analysis input data to CAD geometry
  • 3D visualization of analysis results on original CAD geometry
  • FeatureManager™ for geometry, analysis and result visualization data
  • Customizable analysis tree
  • Dynamic editing of all geometric and analysis features
  • Powerful configuration management for easy “what if ”design variations (geometrical and physical)
  • Comprehensive support for bi-directional CAD data exchange with most major CAD packages
  • Comprehensive, context-sensitive HTML-based help system and tutorials
  • OpenGL graphics taking advantage of the latest Computer Graphics chips

Getriebemotor displacement

checkCAD Interoperability

  • Native file translators to and from nearly all mechanical CAD products on the market today: SolidWorks®, Pro/ENGINEER®, IPT (Autodesk Inventor®), Mechanical Desktop®, Unigraphics®, PAR (Solid Edge®), CADKEY®, IGES, STEP, Parasolid®, SAT (ACIS®), VDA-FS, VRML, STL, DWG, DXF™, TIFF, JPG, Viewpoint, RealityWave, HSF (Hoops)
  • Support of seamless integrated third-party bi-directional file translators, e.g. for CATIA®, Pro/ENGINEER®, etc.
  • Supported standards: ANSI, DIN, ISO,GOSJIS, GB and BSI

checkPart Modeling

  • Feature based, fully associative, parameterized solid modeling
  • FeatureManager™ dynamic design tree (e.g. re-order, drag & drop, etc.)
  • In-place editing
  • Integrated sketching (dynamic referencing)
  • Extrudes, revolves, feature patterns, holes, etc.
  • Advanced 3D operations, e.g. lofting, sweeping, complex blending, filleting, etc.
  • Advanced shelling, midsurfaces
  • Multi-body support
  • Advanced surface modeling: lofts and sweeps with guide curves, fill-in holes, drag-handles for tangency control, etc.
  • Trimming, extending, filleting, and knitting surfaces
  • Translating, rotating, copying, and mirroring surfaces
  • Support for creating 3D models from existing 2D data, e.g. 2D-to-3D extrusion, etc.
  • Multiple design variations with Configuration Management, DesignTables

checkAssembly Modeling

  • Fully associative: referencing of other parts and maintaining relationships when creating new parts
  • Complete range of mating conditions, snap-to-fit SmartMates™
  • Locating conflicting mate relationships with Mate Diagnostics
  • Dynamic assembly visualization
  • Real-time previewing of components, parts
  • Multiple sub-assembly support
  • Design-in-the-context of an assembly (references to other geometry, associative relationships, direct/indirect constraints)
  • Easy designing and changing of parts and subassemblies from within an assembly
  • Mirrored components to create new parts and assemblies based on existing designs
  • Multiple assembly design variations with Configuration Management for easy “what if” design scenarios


  • Global and local controls for part geometry with default sizing
  • Mesh control on arbitrary user defined regions
  • Sketch line or curve meshing
  • Combined shell and beam/bar meshing
  • Free surface meshing: quads or triangles
  • Continuous shell (quad or tri) meshing
  • Auto mesh, loads and constraints update with geometry changes
  • Mesher status window and progress bar
  • Display/hide shell element normals
  • Reverse normals for shell elements
  • Mesh validation checks: Distortion, Jacobian, Skew
  • Display/hide beam element orientation and direction
  • Display/hide beam element and shell element cross-section
  • 1D element cross-section property definition
  • Combined shell (2D) and beam (1D) meshing

checkAssembly Connectors

  • True surface contact
  • Automatic contact
  • Thermal contact resistance

checkLoads and Boundary Conditions

  • Uniform pressure and force on faces, edges and vertices
  • Directional pressure and force
  • Acceleration loads (gravity)
  • Enforced motions: acceleration, velocity, displacement (rotational/translational)
  • Temperature, default temperature and heat flux
  • Symmetric, antisymmetric, axisymmetric boundary conditions
  • Fixed constraints on faces, edges and vertices
  • Directional and prescribed constraints
  • Thermal constraints
  • Thermal body loads
  • Initial temperature conditions
  • Custom colors and sizes for loads and constraints
  • Loads defined using edges
  • Convection
  • Conduction
  • Radiation
  • Heat generation
  • Rotational velocity/acceleration
  • From output (thermal)
  • Load variation using arbitrary 3D scale factors

checkElement Library

  • 1D line (CBEAM, CBAR, CPIPE)
  • 2D linear shell (CQUAD4 and CTRIA3)
  • 2D parabolic shell (CQUAD8 and CTRIA6)
  • 3D linear and parabolic tetrahedron (CTETRA)
  • Composites with plates and shells
  • Surface to surface contact with manual or automatic recognition of surfaces
  • Concentrated mass
  • Connectors
    • Spring (CBUSH)
    • Rigid elements
    • Rod (CROD)
    • Nonlinear cable


  • Isotropic
  • Anisotropic (2D & 3D)
  • Orthotropic (2D & 3D)
  • Nonlinear materials
    • Nonlinear elastic
    • Elasto-plastic
    • Plastic
  • Hardening
    • Isotropic
    • Kinematic
    • Combined
  • Yield
    • Von Mises
    • Tresca
    • Mohr-Coulomb
    • Drucker-Prager
  • Custom stress-strain curve
  • Hyperelastic
    • Neo-Hookean
    • Mooney-Rivelin
    • Ogden
    • Yeoh
    • Generalized polynomial
  • Temperature dependent property support

checkMaterial Orientation

  • Vector projection
  • Curve tangent
  • Rotated curve tangent
  • Translated curve tangent
  • Surface U and V directions


  • 1D beam (PBEAM/PBEAML) and bar (PBAR/PBARL)
  • 2D plate (PSHELL) and composite (PCOMP)
  • 3D solid (PSOLID)
  • Contact (BSCONP)

checkSurface Contact

  • Automatic surface contact generation
  • General, welded, slide, rough, offset weld and RBE3 element contact types
  • Static friction

checkAnalysis Types

  • Linear statics
  • Normal modes
  • Linear buckling
  • Nonlinear statics
  • Thermal stress
  • Prestress static
  • Composite
  • Contact analysis in assemblies
  • Linear steady state heat transfer
  • Optimization
  • Modal transient response
  • Direct transient response
  • Direct frequency response
  • Modal frequency response
  • Nonlinear steady state heat transfer
  • Nonlinear transient heat transfer
  • Nonlinear transient response

checkComposite Analysis

  • Various failure theories supported:
    • Hill
    • Hoffman
    • Tsai-Wu
    • Max. stress
    • Max. strain
    • NASA LaRC02

checkOptimization Analysis

  • Design objectives to minimize, maximize or reach target values
  • Parametrically update geometry dimensions
  • Optimize weight, stress, material properties, temperature, eigenvalue, plate and laminate properties thickness

checkDrop Testing Analysis

  • Automatic impact wizard
  • Acceleration and contact direction input
  • Time stepping automatically calculated based on natural frequency

checkCoordinate Systems

  • Cartesian, cylindrical and spherical coordinate systems
  • Referencing global assembly, part or custom coordinate systems
  • Display toggles


  • Stress, deformation plots
  • Principal and directional stress plot
  • Strain plot
  • Resonant frequencies, mode shape plots
  • Temperature, heat flux plots
  • Iso-surfaces
  • Results across composite laminates
  • Partial results generation for modal and transient analysis types
  • Export Nastran input deck to other FEA systems
  • Customizable material library
  • Output within NEi Fusion Modeler view with sensitive Help and analysis control, such as pausing and solution termination
  • Import results using Femap Binary Neutral file format (FNO)
  • Single and multi-set animations
  • Max/min labels
  • Results processed on selected parts of assemblies
  • Dynamic result data display during nonlinear analysis
  • Loads and constraints shown on deformed plots
  • XY plot capability
  • Section cut capability

checkReport Generation

  • HTML formatted reports for linear static analysis
  • Customizable report format
  • Step by step wizard for report generation process
  • Includes standard model data


  • Part and Assembly geometry is fully compatible with SolidWorks’ Parts and Assemblies
  • Nastran input file can be sent to any Nastran FE Solver including NEi Nastran, NX Nastran, or MSC.Nastran
  • Binary results file in OP2 format usable by all Nastran solvers and wide variety of post-processors

checkUser Interface

  • Menu support for all features
  • Toolbar shortcuts
  • Modern tree view layout
  • Query display of real time information on nodes and elements
  • Highlight specific nodes and elements on the model
  • Total number of nodes/elements displayed in assembly tree
  • Section view for parts and assemblies
  • Dynamic update of loads, constraints, and rigid bodies

checkInternational Languages

  • GUI: English, Japanese, Italian, French
  • Technical documentation: English

checkSystem Requirements

  • Intel Pentium® 4 or AMD based PC as a minimum, Intel Core™ i7, Xeon, AMD Opteron recommended
  • 1 GB RAM minimum, more recommended
  • 4 GB free hard disk space for installation, more required for simulation models
  • Microsoft Windows XP® Professional with SP2 or greater, Vista Ultimate, Business and Enterprise editions, Windows 7 Professional, Ultimate and Enterprise,  32-bit and 64-bit

NEi Fusion Compatibility Matrix

NEi Fusion 2.1
NEi Fusion 2.0
NEi Fusion 1.4
SolidWorks Support1
SolidWorks 2010
SolidWorks 2009
SolidWorks 2008  
Operating System Support2
Windows 73 (64 bit)
Windows 73 (32 bit)
Vista4 (64 bit)5
Vista4 (32 bit)
XP Professional (64 bit)
XP Professional (32 bit)

1 SolidWorks version indicates what version of SolidWorks files can be opened.
2 Windows 2000 Professional, 2003 Server, and 2008 Server are no longer supported.
3 Professional, Ultimate, and Enterprise editions only.
4 Ultimate, Business and Enterprise editions only (SP0 or higher).
5 Windows Vista 64-bit is supported for SolidWorks 2008 SP3.1 or higher. The Education Edition, Student Edition, and Student Design Kit are supported after the 2008-2009 academic school year.

Product Brochures

PDFNEi Fusion 2.1 Brochure
PDFNEi Fusion 2.1 New Features

Product Flyer

PDFNEi Fusion 2.1 Software Bundle

Additional Information

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