Section Properties from a Shapley Polygon

[nira123]

Thank you for developing this module. I am quit new here please bare with me.

I am trying to get the section properties from a Shapley Polygon including the torsional constant.
I am getting the flowing error:
ValueError: Argument 'mesh_sizes' for a Geometry must be either a float, or a list of float with length of 1, not [0.0005, 0.001].

Can someone please help.
Code is given below:

from sectionproperties.pre.geometry import Geometry
from sectionproperties.analysis.section import Section
from sectionproperties.pre.pre import Material
from sectionproperties.analysis.section import Section
from shapely.geometry import Polygon, LineString, Point

precast = Material(
    name="65 MPa",
    elastic_modulus=37.4e3,
    poissons_ratio=0.2,
    yield_strength=65,
    density=2.4e-6,
    color="grey",
)

poly_2=[(-1000, 1150),
 (1000, 1150),
 (1000, 1300),
 (-1000, 1300)]


p2 = Polygon(poly_2)
geometry = Geometry(p2, material=precast)
geometry.create_mesh(mesh_sizes=[0.0005, 0.001])
section = Section(geometry)
section.plot_mesh()  # plot the generated mesh
section.calculate_geometric_properties()
section.calculate_warping_properties()
section.calculate_plastic_properties()
section.plot_centroids()

[nira123]

I think I found the error :
geometry.create_mesh(mesh_sizes=[500])
Thanks.
Is it possible to filter only J?

[nira123]

Got it :
section.get_j()
Awesome thanks.

[Czarified]

Nira,

Glad you worked it out! The mesh_sizes argument does accept a list, if you have multiple meshing regions defined. I believe we have an example of this in the docs.

the .get_j() is probably the easiest way to grab only the torsional constant.

[nira123]

Cheers Czarified.
Thanks a lot.

[robbievanleeuwen]

Hi @nira123, welcome to sectionproperties. Glad you sorted your issue out, let us know if you have any more questions!

[nira123]

Thanks a lot Robbie.
Excellent work!