7-62. Determine the shear-stress variation over the cross section of the thin-walled tube as a function of elevation y and show that tmax = 2V/A , where A = 2prt. Hint: Choose a differential area element dA = Rt du . Using dQ = y dA, formulate Q for a circular section from u to (p - O) and show that Q = 2R2t cos O, where cos O =sqrt (2R2 - y2) / R. | |
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