FinalPracticeQuestions

FinalPracticeQuestions - PROBLEM 1 - Elasticity PROBLEM 2...

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PROBLEM 1 - Elasticity
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PROBLEM 2 Plasticity and Deformation
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PROBLEM 3 - Creep A chemical reaction chamber, similar to the one shown below, is made of type 304 stainless steel. The cover bolts of the chamber, which are made of the same steel, are pre-tensioned at room temperature to a stress of 10,000 psi. The service temperature of this chamber is 1100°F. How long can the chamber be used at this temperature before the stress in the bolts drops below 5,000 psi at the operating temperature? . It may be assumed that the deflection of the flanges during the tightening is negligible compared to the extension of the bolts. This implies that the total strain remains constant throughout the life of the chamber. . You may assume a constitutive law for creep for 304 stainless steel of the form: ° ° ? = ± ² ² ? ³ ´ µ¶? ± −· ¸¹ ³ where σ o = 62 psi, m = 8, H = 5.85 x 10 -18 in- lb, k = Boltzmann’s constant (6.79x10 -23 in-lb/°R, °R = °F + 460) Note: The elastic modulus of the steel varies with temperature.
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FinalPracticeQuestions - PROBLEM 1 - Elasticity PROBLEM 2...

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