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666_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

666_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

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660 CHAPTER 8 Applications of Plane Stress Problem 8.3-8 Solve the preceding problem if d 90 mm, F 42 kN, and t allow 40 MPa. Solution 8.3-8 Cylinder with internal pressure d 90 mm r 45 mm F 42.0 kN t allow 40 MPa Find minimum thickness t min . Pressure in cylinder: p F A F p r 2 Maximum shear stress (Eq. 8-10): Minimum thickness: Substitute numerical values: t min 42.0 kN 2 p (45 mm)(40 MPa) 3.71 mm ; t min F 2 p r t allow t max pr 2 t F 2 p rt Problem 8.3-9 A standpipe in a water-supply system (see figure) is 12 ft in diameter and 6 inches thick. Two horizontal pipes carry water out of the standpipe; each is 2 ft in diameter and 1 inch thick. When the system is shut down and water fills the pipes but is not moving, the hoop stress at the bottom of the standpipe is 130 psi.

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666_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

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