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Unformatted text preview: Review 2 Fall 08 1. A pressurized steel tank is constructed with a helical weld that makes an angle = 60 o with the longitudinal axis (see figure). The tank has radius r and wall thickness t and is subjected to an internal pressure p . An electrical resistance strain gage placed along the weld measure the extensional strain in the weld direction . The Youngs modulus and Poissons ratio for the tank material (steel) are given as E and , respectively. (a) Find expressions for longitudinal (axial) strain a , circumferential (hoop) strain h and shear strain ah in terms of E , , p , r and t . (b) Using the strain transformation (formula or Mohrs circle), find an expression for the strain along weld direction, in terms of E , , p , r and t . (c) Equating the expression obtained in part (b) to the measured strain , find internal pressure p in terms E , , r , t and . (d) If a h 5 = , find Poissons ratio ( use expressions obtained in part a ) ....
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- Spring '11