Nastran Finite Element Analysis and Simulation Software
NEi Nastran Composites Analysis
Key Composite Analysis Features
Composite materials analysis imposes a number of requirements that are significantly different when compared to isotropic materials. FEA software used for composite analysis must be designed to handle the anisotropic nature of composites and the failure mechanisms associated with their properties like cracks, delaminations, and fiber failure. In addition, high quality FEA software should include features that make it easy to use while providing the engineer with the power to get practical and valuable results to real world problems.
NEi Nastran provides composite designers with a number of features in model creation, material definition, meshing, post processing, failure criteria, and data presentation.
1. User friendly definition of material properties
Clear, easy input of strength and stiffness terms with access to material libraries.
2. Definition of ply lay-up
Stacking sequences can be quickly and easily entered into a table, and symmetry can be used to reduce entries. Modification and changes are easily made and the chance of error is greatly reduced.
3. Easy orientation definition
Curved surfaces can complicate the orientation of fibers. NEi Nastran can project a cylindrical or spherical coordinate system onto a structure to get good representation of ply orientation. Advanced application can carry out draping analysis with Simulayt if this degree of fidelity is required.
4. Outer mold line representation
Ensures mesh congruence during modeling process.
5. Post processing visualizations that pinpoints problem areas
Enormous amounts of data can be involved in multi lay-up and multi ply structures. NEi Nastran provides a logical path from stress analysis of a structure to Failure Index results that can isolate problems and pinpoint them to definite regions on specific plies.
6. Failure Indices and Strength Ratio
NEi Nastran supports all the major composite failure analysis indices Tsai-Wu, Hill, Hoffman. Plus NEi Nastran includes the most modern forms of Puck and NASA Langley LARC02. In addition, the Strength Ratio is available for easy linear scaling and qualitative analysis.
NASA Langley has developed LARC02, a set of first-ply-failure criteria which have shown to be accurate and physically consistent. It is well suited for design purposes because it balances accuracy, material characterization requirements, computational effort, and ease of results interpretation.
Advanced Failure Criteria for Composites
Stability Index Output for Sandwich Structures
Theory based on Facesheet Wrinkling in Sandwich Structures, NASA-CR-1999-208994, 1999
Honeycomb Sandwich Material Properties
For more information see "Finite Element Implementation of Advanced Failure Criteria for Composites".
7. Import 3D CAD models
8. Sensitivity and configuration trade off studies
NEi Nastran Editor feature is perfect for composite analysis because it provides an easy inexpensive way to do sensitivity and configuration trade off studies.
Coming in NEi Nastran 10.1
MCT Ply Failure Analysis
NEi Nastran incorporates Firehole Composites’ multiscale approach developed specifically for achieving more accurate results with composite materials when comparing analysis data to actual test results.
Progressive Ply Failure Analysis (PPFA™)
PPFA allows engineers to examine structural behavior beyond first ply failure (FPF) and understand post FPF events of the composite material in the nonlinear field.
Composites Modeler for Femap
Composites Modeler for Femap by Simulayt provides state-of-the-art fiber simulation, ply modeling, and draping analysis, with property verification, results utilities and direct integration with the Layup Pipeline.
Composites Modeler for SolidWorks®
Composites Modeler for SolidWorks provides advanced ply-based model building, draping analysis, and proven fiber simulation capabilities — all seamlessly integrated within SolidWorks.
Phone (U.S.): (877) - Nastran
Phone (International): +1 (714) 899-1220