Quick Start

Overview

• Features
  • Overview
  • BDF Reader/Writer
  • OP4 Reader/Writer
  • OP2 Reader / OP2 Writer / F06 Writer
    • OP2 Results
    • Main OP2 Results
    • OP2.Results()
    • Matrices with explicit methods
  • F06 Plotter
  • GUI
    • Nastran Specific Features
      • Nastran Geometry Results
      • Nastran OP2 Results
    • Converters / Additional GUI Options

BDF

• BDF Overview
  • Introduction
  • Example 1: Read/Write
  • Example 2: Printing Nodes
    • Method 1 - using objects
    • Method 2 - using built-in methods
  • Example 3: Printing Elements/Properties
    • Method 1 - using objects
    • Method 2 - using built-in method
    • Method 3 - using built-in methods
  • Example 4: Get Element ID & Type
    • Method 1 - using objects
  • Example 5: Get Elements by Node ID
  • Example 6: Get Elements by Property ID
  • Example 7: Get Elements by Material ID
• BDF Introduction
  • Let’s load the iSat model into the pyNastranGUI
  • Loading a BDF
    • The class-based method
    • The function-based method
  • Interrogating the BDF object
  • Cross-referencing
    • Without Cross-Referencing (xref=False)
    • Cross-Referenced (xref=True)
      • Let’s show off the GRID card
  • Calculating the mass of the structure
    • Examples of xref on elements
  • Write the modified deck
  • pyNastranGUI
• We can also script the GUI!
• test_bdf demo

OP2

• OP2 Overview
  • Introduction
  • Example 1: Read Write
  • Example 2: Displacement (static)
  • Example 3: Eigenvector (transient)
  • Example 4: Solid Stress (static)
  • Example 4: Solid Stress (static)
  • Example 5: Isotropic Plate Stress (static)
  • Example 6: Composite Plate Stress (static)
• OP2 Introduction
  • Why use the OP2? Why not use the F06/PCH file?
  • Validating an OP2
  • Import the packages
    • Sets default precision of real numbers for pandas output
  • OP2 Introspection
    • If that’s too long…
  • Accessing the Eigenvectors object
    • Numpy-based Approach
    • Pandas-based Approach
  • Accessing the plate stress/strain
    • Similar to the BDF, we can use object_attributes/methods
    • Number of Nodes on a CQUAD4
      • What sets this?
      • How do we know if we’re bilinear?
      • What locations are chosen?
      • What sets this?
      • How do we know if we’re using fiber_distance?
  • Accessing results
    • Let’s print out the actual mass properties from the OP2 and get the same result as the F06
      • We can also write the full F06
  • It’s not like Nastran is perfect either.
    • Limitations
    • Weight Statement
• OP2: Numpy Demo #1 (Displacement, Solid Stress)
  • Import the packages
  • Load the model
  • Find the min/max Displacement magnitude
  • Find the max centroidal stress on the CTETRA elements
  • The 0 location is the centroid
    • Finding the VM stress associated with a single node ID
    • Finding the centroidal VM stress for a set of elements
    • Finding the centroidal VM stress for a set of elements when you have multiple element types
  • We have a problem where our element_id (1000000) is out of range
  • Other Elements that are Similar
• OP2: Numpy Demo #2 (Composite Plate Stress)
  • Load the model
    • Accessing the Composite Stress
      • Composite Stress/Strain data is tricky to access as there is not a good way to index the data
  • More realistic pivot table
    • Grid Point Forces - Interface Loads
• test_op2
  • Example
  • Calling Signature
• Pandas
  • Pandas Introduction
  • Another Pandas Intro
  • Static & Transient DataFrames in PyNastran
  • Transient DataFrames in PyNastran
  • Manipulating the Pandas DataFrame
• Transient DataFrames in PyNastran
  • We’ll use standard pyNastran methods to load a model. We’ll set build_dataframe=True to make pandas objects
• Manipulating the Pandas DataFrame
  • This example will use pandas unstack
• Static & Transient DataFrames in PyNastran
  • Solid Bending
  • Single Subcase Buckling Example
    • Let’s look at an odd case:
  • Moving onto the data frames
  • Static Table
  • Transient Table

OP4

• OP4 Demo
  • Import pyNastran
  • Print the docstring
    • So as you can see, Nastran has many matrix formats.
    • There are more ways to read an OP4

GUI

• Graphical User Interface (GUI)
  • Versioning Note
    • Overview
    • Introduction
  • Advantages of pyNastranGUI
  • Advantages of Patran/FEMAP
    • Purpose of additional formats
    • Features
  • Major Features
  • Minor Features
    • Nastran Specific Features
    • BDF Requirements
    • Additional Formats
• Results
  • Derivation Method
  • Nodal Combine
    • Solid Stress / Strain
  • Nodal Combine
    • Composite Plate Stress / Strain
    • Shear-Moment-Torque Plot
• Custom Results
• Edit Geometry Properties Menu
• Modify Legend Menu
• Animation Menu
• Preferences Menu
• Picking Results
• Center of Rotation
• Model Clipping
• Modify Groups
• Camera Views
• Scripting
  • Option #1
  • Option #2

Other

• Calling pyNastran from Matlab
  • Note about Speed
  • Working around Matlab’s oddities
  • Example 1 - BDF
  • Example 2 - OP2
• MSC/NX Nastran Differences