A spherical pressure vessel is fabricated from nylon 66 and will be used at 60C and...
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A spherical pressure vessel is fabricated from nylon 66 and will be used at 60°C and 50% relative humidity. The vessel dimensions are 50-mm outer radius and 5-mm wall thickness. (a) What internal pressure is required to produce a stress in the vessel wall of 6.9 MPa (1,000 psi)? (The stress in the vessel wall is σ pr 2t' where p is the internal pressure, r is the outer radius of the sphere, and t is the wall thickness.) (b) Calculate the circumference of the sphere after 10,000 h at this pressure. (Note Figure 6.38.) Strain (%) 5 4 3 1 13.8 MPa (2.000 psi) 6.9 MPa (1.000 psi) 0 0.001 0.01 0.1 1 10 Time (hours) 100 1,000 10,000 FIGURE 6.38 Creep data for a nylon 66 at 60°C and 50% relative humidity. (From Design Handbook for DuPont Engineering Plastics, used by permission.) A spherical pressure vessel is fabricated from nylon 66 and will be used at 60°C and 50% relative humidity. The vessel dimensions are 50-mm outer radius and 5-mm wall thickness. (a) What internal pressure is required to produce a stress in the vessel wall of 6.9 MPa (1,000 psi)? (The stress in the vessel wall is σ pr 2t' where p is the internal pressure, r is the outer radius of the sphere, and t is the wall thickness.) (b) Calculate the circumference of the sphere after 10,000 h at this pressure. (Note Figure 6.38.) Strain (%) 5 4 3 1 13.8 MPa (2.000 psi) 6.9 MPa (1.000 psi) 0 0.001 0.01 0.1 1 10 Time (hours) 100 1,000 10,000 FIGURE 6.38 Creep data for a nylon 66 at 60°C and 50% relative humidity. (From Design Handbook for DuPont Engineering Plastics, used by permission.)
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Answer Given Wall thickness 5mm 0005 m Outer radius T 50 mm 005... View the full answer
Related Book For
Principles of heat transfer
ISBN: 978-0495667704
7th Edition
Authors: Frank Kreith, Raj M. Manglik, Mark S. Bohn
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