고체역학 (Beer) — Transformations of Stress and Strain: Problem 7.113

7.113 For the compressed-air tank of Prob. 7.112, determine the gage pressure that will cause a shearing stress parallel to the weld of 30 MPa. [Reference from Prob. 7.112: The cylindrical portion of the compressed-air tank shown is fabricated of 8-mm-thick plate welded along a helix forming an angle \(\beta = 30^\circ\) with the horizontal. From Fig. P7.112, the outer diameter is 600 mm.]