A cylindrical tank is assembled by welding steel sections in a heli-cal pattern with angle ? 5 50°. Tank diameter is 1.6 m, thickness is 20 mm, and internal pressure is 2.75 MPa. Modulus E 5 210 GPa and Poisson’s ratio ? 5 0.28. The longitudinal strain in the the wall of the tank is approximately:
(A) 1.2 3 1024
(B) 2.4 3 1024
(C) 3.1 3 1024
(D) 4.3 3 1024
(A) 1.2 3 1024
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