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16 Features NEi Nastran Has That Other Nastran Versions Do Not |
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10 Reasons to Consider NEi Nastran over Other Nastran Versions
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Vibration Fatigue |
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- Fatigue life and fatigue damage due to random vibration calculated based on Steinberg’s three banded technique
- Allows for quick assessment and predictability of outcome of standard industry vibrational testing
- Greatly improves upon predicting structural failure due to vibration based on RMS (root mean square) outputs and response PSDs
- Fatigue capability typically found in costly specialized fatigue packages in core NEi Nastran
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Automated Surface Contact Generation (ASCG) |
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- Solver will search for element faces in contact and automatically setup the contact between discontinuous bodies
- Can be used for automatically welding parts together or automatically defining nonlinear surface contact in complex regions
- No geometry is required
- Legacy Nastran models supported- ability to upgrade from legacy GAPs to surface contact with a single Case Control Command
- Ability to weld parts together through a small gap automatically, which prevents manual definition of multiple master-slave regions with an offset
- Additional references: Surface Contact Webpage and Automated Surface Contact Generation (ASCG) usage in NEiNastran
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Linear Surface Contact |
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- True 3D surface contact with closing and opening of gaps in core Nastran linear statics (SOL 101)
- Iterative strategy saves hours of nonlinear run time
- Works with Automatic Surface Contact Generation (ASCG)
- Makes linear gap elements obsolete
- Ideal for large contact models that are initially in contact
- Fast trade studies for bearing assemblies analyzed in minutes
- Additional references: Surface Contact Webpage and Automated Surface Contact Generation (ASCG) usage in NEiNastran
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Linear and Nonlinear Surface Contact |
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- Free edges contacting surfaces now identified automatically
- Edge to face welding carried out automatically
- No element congruence required
- Offsets and gaps between edges and faces are permissible
- Rapid meshing of complex shell structures now possible
- Ideal for large thin shell fabrications such as ship, aircraft, and automotive structures
- Additional references: Surface Contact Webpage and Automated Surface Contact Generation (ASCG) usage in NEiNastran
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Automated Impact Analysis (AIA)
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- Arbitrary object and target shapes
- Automatic object repositioning
- Uses Automatic Surface Contact Generation (ASCG) to automatically define contact regions
- Automatic natural frequency calculations of object and target allows optimum calculations of time steps and impact duration
- Nonlinear Transient Analysis – all data calculations and data transfer carried out
- Automatic real-time output of X-Y data at impact points during analysis
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Solid Composites
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- CHEXA and CPENTA support layered material definitions using the PCOMP Bulk Data entry
- Overcomes the limitations of Classical Laminate Theory, which include the failure to take into account local design details such as jointed regions and T connections
- Transverse shear and the through thickness normal stresses are included as a direct result of the triaxial stress state in the fully 3D orthotropic material
- Mapping of 3D ply layup from existing 2D PCOMP data
- Conversion of MAT8 (2D orthotropic) to new MAT12 (3D orthotropic)
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NEi Nastran Editor
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- Fully integrated and customizable Nastran Editor controls program operation and provides results summary data through an easy to use GUI
- Full post processing and results query
- Tabbed windows to give immediate access to all input and output files
- Field markers make manual editing simple and increase productivity dramatically
- Complete online documentation and context sensitive help
- Permits batch queuing of jobs for sensitivity and configuration trade studies
- Special real time controls allow changing solution parameters while running
- Real time 2D x-y plotting and 3D deformed shape and contour plotting with optional MS Excel Comma Separated Variable (.CSV) file output
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Advanced Shell and Solid Element Formulations |
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- Higher order internal shape functions
- Proprietary technology of NEi Software
- 6 DOF/Node CQUADR/CTRIAR element support
- Does not require K6ROT or SNORM
- Supported in ALL solution modules including nonlinear
- Robust results with distorted elements
- Faster mesh convergence
- Extensive verification and comparison problem set that demonstrate superior accuracy
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3D Linear and Nonlinear Surface-to-Surface Contact and Linear and Nonlinear Weld and Bi-Directional Slide
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Surface Contact Element
- Allows translation and rotation at the same time
- Permits modeling of problems that are not possible with gap or slide line (3D sliding)
- Adaptive stiffness update
- Allows friction
- Fully automated setup using a single command or easy manual setup using a 3 step process, no need to align nodes or elements
- Weld and bi-directional slide element options
- Provided as part of the core product and not as a costly add-on
Weld and Bi-Directional Slide Element
- Uses surface contact element
- Default element property settings automatically provide adequate penalty stiffness at the weld interface
- Adaptive algorithm automatically adjusts penalty values based on surrounding stiffness
- Supported in all solutions
- Standard MSC CWELD (spot weld) element also available
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