circular hollow section, with outer diameter d (in mm), and thickness t (in mm).
The circular hollow section is made from aluminium which has a density of 2700
kg/m .
The outer surface of the CHS can withstand a maximum shear stress of 70 MPa.
The inner surface of the CHS can withstand a maximum shear stress of 60 MPa.
What is the maximum twisting moment (in kNm) the CHS can withstand without
exceeding the maximum inner and outer surface stresses?
Part D
dD = 180 mm
tD = 2 mm