MatrixRankWarning for angle section with thickness equal to toe radius

[Ernst79]

• sectionproperties version: 3.2.1
• Python version: 3.11
• OS version and name: Windows

• [x] I am on the latest stable sectionproperties version, installed using a recommended method.
• [x] I have searched the issues of this repo and believe that this is not a duplicate.
• [x] I have consulted the documentation for any relevant information.

Issue

First of all, thanks for this wonderful piece of work.

I have a small issue, when creating and analyzing an angle section.

from sectionproperties.pre.library import angle_section
from sectionproperties.analysis import Section

geom = angle_section(d=20, b=20, t=3, r_r=3.5, r_t=3, n_r=16)
geom.create_mesh(mesh_sizes=[20 / 20])

# create mesh
sec = Section(geometry=geom)

# analyse mesh
sec.calculate_geometric_properties()
sec.calculate_warping_properties()
sec.calculate_plastic_properties()

ixx_c, iyy_c, ixy_c = sec.get_ic()
zxx_plus, zxx_minus, zyy_plus, zyy_minus = sec.get_z()

print("area:", int(sec.get_area()))
print("Ixx:", int(ixx_c))
print("Iyy:", int(iyy_c))
print("Ixy:", int(ixy_c))

The above code return the following warning

The problem only occurs if the toe radius is the same as the thickness of the angle, probably due to the vertical part of the bottom flange is getting a length of t - r_t = 0.00000.

[github-actions[bot]]

Thanks for opening your first issue in sectionproperties :raised_hands: Pull requests are always welcome :wink:

[robbievanleeuwen]

Hi @Ernst79, thanks for submitting the issue. This has been fixed with #429. There will be a new release shortly that incorporates this fix!

[Ernst79]

Thanks!