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EMA 405

EMA 405. Coordinate Systems. Introduction. There are many coordinate systems in ANSYS Global and Local: used to locate geometry items (nodes, keypoints , etc.) Display: determines systems in which geometry is displayed Nodal: degree of freedom directions and nodal results

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EMA 405

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  1. EMA 405 Coordinate Systems

  2. Introduction • There are many coordinate systems in ANSYS • Global and Local: used to locate geometry items (nodes, keypoints, etc.) • Display: determines systems in which geometry is displayed • Nodal: degree of freedom directions and nodal results • Element: material properties and element results • Results: transforms nodal or element results for listing or display (general postprocessor) • Working plane: used for drawing geometric primitives

  3. Results Coordinates • General Postprocessor/Options for Output • For cylindrical, x-direction is r-direction, y-direction is theta direction, z direction is axial direction

  4. Why do we need these • Element system: consider wood elements with grain at 45 degrees • Easiest to define E separately in grain direction and perpendicular direction (rotate element system 45 degrees) y x

  5. Why do we need these? • Orienting geometry elements • Rectangles are always oriented relative to working plane • To draw rectangle such as the one below, rotate the working plane

  6. Why do we need these? • Nodal coordinates • What if we have a set of forces oriented radially • Just select nodes on perimeter, change nodal coordinate system to cylindrical, and then set Fx

  7. Exercise Only radial displacements p Inner radius=5 cm Outer radius=10 cm Angular extent = 45 degrees E=200 GPa =0.3 Pressure=1 MPa Only radial displacements

  8. Exercise • p=1 MPa • E=200 GPa • =0.3 • Inner radius is fixed • Inner radius = 5 cm • Outer radius = 10 cm

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