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Algor, the commercial FEM package, an introduction

Algor, the commercial FEM package, an introduction. Group: 3 Ian Fulton Timothy Chin James Bernstein Hussain Khersoh. 3 Basic Stages to Algor. Preprocessing Processing Post Processing. Procedure. Preprocessing Stage. Create Model Nodal point locations Element selection

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Algor, the commercial FEM package, an introduction

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  1. Algor, the commercial FEM package, an introduction Group: 3 Ian Fulton Timothy Chin James Bernstein Hussain Khersoh

  2. 3 Basic Stages to Algor • Preprocessing • Processing • Post Processing

  3. Procedure

  4. 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

  5. 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

  6. 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)

  7. Post Processing cont.. • Look at deformed displacements and check for consistency with expected results • Look at stresses and compare to approximate solution

  8. Creating A Model • Setting up unit system after model is drawn

  9. Creating A Model • Assign groups

  10. Creating A Model • Apply boundary conditions

  11. Creating A Model • Define each element type

  12. Creating A Model • Assign cross sectional area

  13. Creating A Model • Define material type (characteristics)

  14. Creating A Model • Set stress analysis conditions

  15. Creating A Model • Analyze

  16. Creating A Model • View results (Displaced model shown)

  17. Creating A Model • Results (P/A model shown)

  18. 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

  19. Refined Model

  20. Conclusion • 3 stages of Algor • Pre-Processing • Processing • Post Processing • Design • Analysis & Re-design • Time Saver

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