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EMA 405 Coordinate Systems

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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

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

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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) x y

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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

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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

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

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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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