QuestionQuestion

Schedule 40 pipe is made of mild steel, which is ductile (well into its “upper shelf”) at ordinary temperatures (around 300 K).
KIc of mild steel is about 140 Mpa√m.
Based on the calculation of stress intensity in a cracked 6 inch schedule 40 pipe filled with 1000 psig water (about 6 Mpa√m), and without knowing anything further about the pipe’s environment, what failure modes are possible?
a. brittle fracture
b. ductile fracture
c. high cycle fatigue
d. low cycle fatigue
e. radiation embrittlement
f. thermal creep

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The circumferential stress in the pipe from the 1000 psi internal pressure is calculated as: Pr/t. The value of t for 6" schedule 40 pipe is 0.28", therefore the circumferential stress is 10,714 psi....

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