XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX''"> Building a Finite Element Model for Analysis
Patran provides numerous ways to create a finite element model. Before proceeding, it is important to determine the analysis requirements of the model. These requirements determine how to build the model in Patran. Consider the following:
Table 1‑1 Considerations in Preparing for Finite Element Analysis Desired Response Parameters | Displacements, Stresses, Buckling, Combinations, Dynamic, Temperature, Magnetic Flux, Acoustical, Time Dependent, etc. |
Scope of Model | Component or system (Engine mount vs. Whole Aircraft). |
Accuracy | First “rough” pass or within a certain percent. |
Simplifying Assumptions | Beam, shell, symmetry, linear, constant, etc. |
Available Data | Geometry, Loads, Material model, Constraints, Physical Properties, etc. |
Available Computational Resources | CPU performance, available memory, available disk space, etc. |
Desired Analysis Type | Linear static, nonlinear, transient deformations, etc. |
Schedule | How much time do you have to complete the analysis? |
Expertise | Have you performed this type of analysis before? |
Integration | CAD geometry, coupled analysis, test data, etc. |
Table 1‑1 lists a portion of what a Finite Element Analyst must consider before building a model.The listed items above will affect how the FEM model will be created. The following two references will provide additional information on designing a finite element model.
• NAFEMS. A Finite Element Primer. Dept. of Trade and Industry, National Engineering Laboratory, Glasgow,UK,1986.
• Schaeffer, Harry G, MSC⁄NASTRAN Primer. Schaeffer Analysis Inc., 1979.
In addition, courses are offered at MSC.Software Corporation’s MSC Institute, and at most major universities which explore the fundamentals of the Finite Element Method.