A cylindrical surface of radius radius 4 and axis on the xz-plane and at a distance of 1.5 units from the xy-plane. The thickness of the cylinder is 4 units and the curvilinear length is half the circle.
I use the following code to animate the curved beam in the derivation of bending stress. If you are interested about flexural stress, you can watch the whole video here: https://www.youtube.com/watch?v=5LXEHkeL8Ck&t=86s. You can jump to 3:30 if you are only interested to how this was implemented to the video.
from manimlib.imports import * class PartialCylinder(ThreeDScene): def construct(self): # Call the xyz-axes xyz = ThreeDAxes() # Define surface attributes. Note: TAU = 2*PI CylSurf = ParametricSurface( self.CylindricalSurface, u_min=PI, u_max=TAU, v_min=-2, v_max=2, resolution=(15,7) ).set_fill(opacity=0.8) # Initialize camera to show the xz-plane self.set_camera_orientation(phi=90*DEGREES, theta=-90*DEGREES) # Create the surface together with the xyz-axes self.play(ShowCreation(CylSurf), ShowCreation(xyz), run_time=2) self.wait(1) # Rotate Camera self.move_camera(phi=60*DEGREES,theta=-60*DEGREES,run_time=3) self.begin_ambient_camera_rotation(rate=0.2) self.wait(8) # Parametric Equation of Cylindrical surface with axis parallel to # and 1.5 units above the xy-plane def CylindricalSurface(self, u, v): return [ 4*np.cos(u), v, 4*np.sin(u) + 1.5 ]