Consider the structure shown. All wall thicknesses are equal to tw and all strin
ID: 1852304 • Letter: C
Question
Consider the structure shown. All wall thicknesses are equal to tw and all stringer areas are equal to As. You are to assume that there are rigid bulkheads at x = 0 (the fixed end) and x = 120" that can resist pressure but do not affect the torsional rigidity. The internal pressure, p, is 10 psi. The force, F, is 1500 lbs. It may be replaced by an equivalent system that acts through the beam's centroid and which consists of a force, F, of 1500 lbs and a torque, T, of 30,000 in-lbs. Find the skin stresses due to: the pressure only. To do this, you will first need to derive the appropriate equations in a similar manner as that done in class for an internally pressurized stiffened cylinder. torsion only. Here, you may ignore the contribution of the stringers to the torsional rigidity, J. bending only. Give only the result at x = 0 (the fixed end) and express your result in terms of y and/or z. Find the location and magnitude of the maximum effective stress (also called the Von- Mises stress) in the structure. Determine the angle of twist (in degrees) at the free end if the shear modulus, G, equals 4 times 106 psi.Explanation / Answer
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