Standard DIC analysis produces displacement and strain data in Cartesian (x, y, z) coordinates. This works well for many applications, but certain geometries and loading conditions are better understood in alternative coordinate systems. For turbine blades, flywheels, brake rotors, and other rotating machinery, understanding radial versus tangential behavior is critical. A displacement that appears as a complex combination of X and Y components in Cartesian coordinates becomes a clear radial expansion or tangential shift in polar coordinates.
To demonstrate the use of the Polar Coordinate extension in VIC-3D 11.2, we devised a simple test using a speckled ring printed on a piece of paper variously crinkled over 5 images.
Ian Adkins
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