MSE_2610_HW_9 - MSE 2610 Introduction to the Mechanical...

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MSE 2610 Introduction to the Mechanical Properties of Materials Fall 2008 Homework Assignment #9 1.) Cracks were observed in 25% of the steel Liberty ships during World War II. Some even fractured in half on cold nights while docked in calm waters. These failures were due to a ductile to brittle transition that occurs with decreasing temperature in steels. a. Use a sketch of a Davidenkov diagram to explain why the Liberty ships failed in brittle fracture. b. Should the Navy have raised or lowered the nil ductility temperature (NDT) of the steel to obtain greatest toughness during low temperature service? Why? c. Give one example of what could be done to improve the low temperature fracture resistance and explain how this would work using the Davidenkov diagram. 2.) You are designing a thin-walled cylindrical tank of radius r and thickness t that will be used as a pressure vessel. . Pressure vessels are usually designed to prevent catastrophic failure. The pressure vessel material should have a critical crack length greater than the thickness of
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MSE_2610_HW_9 - MSE 2610 Introduction to the Mechanical...

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