2013

Regions
The following table shows the mass properties that are displayed for all regions.
Mass properties for all regions
DescriptionMass property
The surface area of solids or the enclosed area of regions.Area
The total length of the inside and outside loops of a region. The peri-
meter of a solid is not calculated.
Perimeter
The two coordinates that define the bounding box. For regions that
are coplanar with the XY plane of the current user coordinate system,
Bounding box
the bounding box is defined by the diagonally opposite corners of a
rectangle that encloses the region. For regions that are not coplanar
with the XY plane of the current UCS, the bounding box is defined
by the diagonally opposite corners of a 3D box that encloses the re-
gion.
A 2D or 3D coordinate that is the center of area for regions. For regions
that are coplanar with the XY plane of the current UCS, this coordinate
Centroid
is a 2D point. For regions that are not coplanar with the XY plane of
the current UCS, this coordinate is a 3D point.
If the regions are coplanar with the XY plane of the current UCS, the additional
properties shown in the following table are displayed.
Additional mass properties for coplanar regions
DescriptionMass property
A value used when computing the distributed loads, such as fluid
pressure on a plate, or when calculating the forces inside a bending
Moments of iner-
tia
or twisting beam. The formula for determining area moments of inertia
is
area_moments_of_inertia = area_of_interest * radius
2
The area moments of inertia has units of distance to the fourth power.
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