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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
A cylindrical tube in a chemical plant is subjected to an excess internal pressure of 6 MN m-2 , which leads to a circumferential stress in the tube wall. The tube wall is required to withstand this stress at a temperature of 510C for 9 years. A designer has specified tubes of 40 mm bore and 2 mm wall thickness made from a stainless alloy of iron with 15% by weight of chromium. The manufacturer’s specification for this alloy gives the following information.
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Over the present ranges of stress and temperature the alloy can be considered to creep according to the equation
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where A and Q are constants, R is the universal gas constant, and T is the absolute temperature. Given that failure is imminent at a creep strain of 0.01 for the present alloy, comment on the safety of the design.
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