10 Things NEiNastran Has That Other Nastrans Do Not
 

NEiNastran Editor

•

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

Advanced Shell and Solid Element Formulations

•

Higher order internal shape functions

•

Proprietary technology of Noran Engineering, Inc.

•

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

3D Linear and Nonlinear Surface-to-Surface Contact and Linear and Nonlinear Weld and Bi-Directional Slide 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

Quick and simple to setup, 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

Data Interpolation Feature

•

2D or 3D interpolation of input, temperature, displacements, forces, moments, and pressure

•

Allows load transfer across different models / disciplines:

•

Accurate and user-controllable 2D / 3D polynomial interpolation through least-squares approach

Modal Database Management, and Modal Filtering

Modal Base filtering option based on modal effective mass

Modal Data save and re-use option

Very big savings in CPU time possible with all Modal based response method avoiding re-calculation of modal data

Simple interface: best usability

Advanced Failure Criteria for Composites

•

LaRC02 Set of Criteria

• Developed by NASA

• First-ply-failure

• Physically based

• Hashin, Puck approach

• No additional material properties required compared to Tsai-Wu

• Failure mode taken into account

• Extensive validation (WWFE)

 ; 

Stability Index Output for Sandwich Structures

•

Theory based on Facesheet Wrinkling in Sandwich Structures, NASA-CR-1999-208994, 1999

Nonlinear Tension-Only Cable Elements

• Allows initial slack or preload

• Ultimate tensile stress can be specified above which the cable fails

• Supports temperature dependent material properties

• Supported in all solutions

Nonlinear Tension-Only Shell Element

• Tension only membrane reverts to a shear panel in compression

• Designed for analyzing semi-monocoque aircraft structures

• Controllable compression stiffness scale factor

• Currently used by Cessna Aircraft for production design work

Modal Assurance Criteria (MAC)

•

Correlation carried out by NEiNastran in a normal modes analysis

•

No 3rd party software required

•

External or test data can be in CSV, DMIG or MDB format

•

Non-MDB (Modal Database) data will be automatically converted to MDB for re-use

•

Automatic mapping of test to model grid positions

•

Interpolation of test eigenvalue shape to model

•

MAC and ORTHO-MODE correlation supported

•

Text output in the Model Results Output File

•

Graphical support is included in the NEiNastran Editor

•

Future developments include FRF correlation

Results Sorting

•

Automatic and user definable measure sorting for handling multiple load case results

•

Powerful grid and element set generator for generating sets that can be used to control output, define measure coordinate systems, generate grid point temperatures, and define measure sort commands