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113_2009_HW4

# 113_2009_HW4 - UNIVERSITY OF CALIFORNIA College of...

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UNIVERSITY OF CALIFORNIA College of Engineering Department of Materials Science and Engineering Assigned 10/15/09 Due 10/22/09 Fall 2009 MSE 113 Prof. Ritchie Mechanical Behavior of Materials PROBLEM SET 4 List the various metallurgical factors which can be utilized to induce high creep resistance. Contrast these factors with those that might be utilized for high strength at temperatures, T < 0.3 T m . Problem 1 A cylindrical shaft made of 304 stainless steel has been operating at 1300 °F for a sufficient time that second-stage creep strains are large compared to elastic and primary creep strains. If the shaft is 2 inches in diameter and 8 inches long, determine the steady state torque required to twist the shaft through a twist rate of φ = 6 °/hr. Problem 2 The constitutive law for 304 stainless steel at 1300 °F is given approximately by: 𝜀𝜀̇ 𝜃𝜃𝜃𝜃 𝜀𝜀 0 ̇ = �√ 3 𝜎𝜎 𝜃𝜃𝜃𝜃 𝜎𝜎 0 𝑚𝑚 ∙ 𝑒𝑒𝑒𝑒𝑒𝑒 �− � 𝐻𝐻 𝑘𝑘𝑘𝑘 ��

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113_2009_HW4 - UNIVERSITY OF CALIFORNIA College of...

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