Algor, the commercial FEM package, an introduction

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Algor, the commercial FEM package, an
introduction

• Group 3
• Ian Fulton
• Timothy Chin
• James Bernstein
• Hussain Khersoh

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3 Basic Stages to Algor

• Preprocessing
• Processing
• Post Processing

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Procedure
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Preprocessing Stage

• Create Model
• Nodal point locations
• Element selection
• Nodal connectivities
• Material properties
• Displacement boundary conditions
• Loads and load cases
• Preprocessor assembles data into a format for
  execution

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Processor Stage

• Code that solves the system equations
• Generates element stiffness matrices
• Stores data in files
• Assembles the structure stiffness matrix
• Must provide enough displacement boundary
  conditions to prevent body motion
• Solution gives nodal displacements
• With element information , get strain and stress

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Post Processing Stage

• Numeric output data difficult to use
• Reduces data to graphic displays (contour plots,
  graphs)
• Magnifies nodal displacements
• Nodal displacements are single valued
• Stress at a node can be multi-valued if multiple
  elements are attached to the node
• (stress is found from within each element)

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Post Processing cont..

• Look at deformed displacements and check for
  consistency with expected results
• Look at stresses and compare to approximate
  solution

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Creating A Model

• Setting up unit system after model is drawn

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Creating A Model

• Assign groups

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Creating A Model

• Apply boundary conditions

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Creating A Model

• Define each element type

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Creating A Model

• Assign cross sectional area

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Creating A Model

• Define material type (characteristics)

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Creating A Model

• Set stress analysis conditions

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Creating A Model

• Analyze

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Creating A Model

• View results (Displaced model shown)

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Creating A Model

• Results (P/A model shown)

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Re-design/analysis

• Refine model by considering the results of the
  first analysis
• High stress and rapid variations (reduce element
  size)
• Low stress (increase element size)
• Redo analysis and check if results are converging

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Refined Model
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Conclusion

• 3 stages of Algor
• Pre-Processing
• Processing
• Post Processing
• Design
• Analysis Re-design
• Time Saver