Calculate massproperties self created hollow section

[gert.valk]

How to calculate massproperties of self created 2D hollow sections in autocad 2020?

[hak_vz · Accepted solution]

1) create region from outer circle

2) create region from inner circle

3) Use command subtract and subtract inner region from outer region

4) use command massprop

For case in you sample drawing you result is

Command: MASSPROP
Select objects: 1 found
Select objects:
 ----------------   REGIONS   ----------------
Area:                    14042.9192
Perimeter:               2808.5838
Bounding box:         X: -228.5000  --  228.5000
                      Y: -228.5000  --  228.5000
Centroid:             X: 0.0000
                      Y: 0.0000
Moments of inertia:   X: 350913240.8332
                      Y: 350913240.8332
Product of inertia:  XY: 0.0000
Radii of gyration:    X: 158.0779
                      Y: 158.0779
Principal moments and X-Y directions about centroid:
                      I: 350913240.8332 along [1.0000 0.0000]
                      J: 350913240.8332 along [0.0000 1.0000]

[gert.valk · Accepted solution]

Hip Hip Hooray, I just found out how it works, many thanks everyone.

[leeminardi]

1. Read the responses you get and follow the suggestions offered.   From you posts  it doesn't appear you always do this. If you do not understand a response provide as much detailed information as you can as to what you are doing and the result you get,
2. If you cannot select the inner region because the outer region gets selected instead try using the cycle select feature if selecting the region at its edge doesn't work for you.

Don't give up! Good luck.