EMA 405 Coordinate Systems. Introduction There are many coordinate systems in ANSYS Global and...
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Transcript of EMA 405 Coordinate Systems. Introduction There are many coordinate systems in ANSYS Global and...
EMA 405Coordinate Systems
IntroductionThere are many coordinate systems in ANSYSGlobal and Local: used to locate geometry
items (nodes, keypoints, etc.)Display: determines systems in which
geometry is displayedNodal: degree of freedom directions and nodal
resultsElement: material properties and element
resultsResults: transforms nodal or element results for
listing or display (general postprocessor)Working plane: used for drawing geometric
primitives
Results CoordinatesGeneral Postprocessor/Options
for OutputFor cylindrical, x-direction is r-
direction, y-direction is theta direction, z direction is axial direction
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
Why do we need these?
Orienting geometry elementsRectangles are always oriented
relative to working planeTo draw rectangle such as the one
below, rotate the working plane
Why do we need these?
Nodal coordinatesWhat if we have a set of forces oriented radiallyJust select nodes on perimeter, change nodal
coordinate system to cylindrical, and then set Fx
Exercise
p
Only radial displacement
s
Only radial displacement
s
Inner radius=5 cmOuter radius=10 cmAngular extent = 45 degreesE=200 GPa=0.3Pressure=1 MPa
Exercise
p=1 MPa E=200 GPa =0.3 Inner radius is fixed Inner radius = 5 cm Outer radius = 10 cm
radiusouterR
thicknesst
nodesof
ptRF
o
o
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