Multiple Faces
If you identify multiple faces, Creo Elements/Direct Drafting uses the density values to calculate the Common Center of Mass. The density must be specified before a face is identified, otherwise the default value (1) or the previous density value is used.
Creo Elements/Direct Drafting calculates and displays the following total values for multiple faces:
• Total Area.
• Center of Area (common).
• Center of Mass (common).
• Principal Axes through the (common) Center of Area.
• Second Moments of Area about (common) Principal Axes.
• Second Moments of Area about Coordinate System Axes.
• Product of Second Moment of Area about Coordinate System Axes.
• Moments of Inertia about (common) Principal Axes.
• Moments of Inertia about Coordinate System Axes.
• Product of Moment of Inertia about Coordinate System Axes.
• Radii of Gyration with respect to the (common) Center of Area.
• Angle between Coordinate System and (common) Principal Axes.
To display face area properties:
1. Click Tools and Area Properties. Creo Elements/Direct Drafting prompts you to enter a density (default 1) or to select a face.
2. Enter the density value if known, otherwise select the face(s).
3. Click Confirm. The area properties are listed in a text box.
4. Optionally, you can save the list of area properties in a file.
5. Close the text box to return to Creo Elements/Direct Drafting.
Example
I-Section Face
Following figure is a resultant diagram for the I-section face.
Resultant Diagram for I-Section Face
A listing of the Creo Elements/Direct Drafting output for this single face is given below:
ALL VALUES REFER TO THE FOLLOWING UNITS :
LENGTH = 1 MM
ANGLE = 1 DEG
FACE 1:
NUMBER OF HOLES
noh = 0
DENSITY
rho = 1
PERIMETER LENGTH
P = 334
AREA
A = 1470
CENTER OF AREA = CENTER OF MASS
(Cx,Cy) = (289.2011071614633,344.1233317074434)
PRINCIPAL AXES OF INERTIA THROUGH THE CENTER OF AREA (DIRECTIONS)
u = (0.8191520442890209,0.5735764363510046)
v = (-0.5735764363510046,0.8191520442890209)
SECOND MOMENTS OF AREA (ABOUT PRINCIPAL AXES)
Icu = 761433.6734694783
Icv = 334727.5
SECOND MOMENTS OF AREA (ABOUT COORDINATE SYSTEM AXES)
Ix = 174699726.7554225
Iy = 123421911.6970526
PRODUCT OF SECOND MOMENT OF AREA (ABOUT COORDINATE SYSTEM AXES)
Ixy = 146095161.0177031
MOMENTS OF INERTIA (ABOUT PRINCIPAL AXES)
Jcu = 761433.673469478
Jcv = 334727.5
MOMENTS OF INERTIA (ABOUT COORDINATE SYSTEM AXES)
Jx = 174699726.755422
Jy = 123421911.697053
PRODUCT OF MOMENT OF INERTIA (ABOUT COORDINATE SYSTEM AXES)
Jxy = 146095161.017703
SECTION MODULI ABOUT PRINCIPAL AXES
Zcu = 23392.00626959447
Zcv = 10299.30769231674
DISTANCE FROM NEUTRAL AXIS u TO EXTREME FIBER
Du = 32.55102040816436
DISTANCE FROM NEUTRAL AXIS v TO EXTREME FIBER
Dv = 32.5
RADII OF GYRATION WITH RESPECT TO THE CENTER OF AREA
Rcu = 22.7592199074477
Rcv = 15.08992320434836
ANGLE BETWEEN COORDINATE SYSTEM AND PRINCIPLE AXES
phi = 35