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113_2009_HW7 - UNIVERSITY OF CALIFORNIA College of...

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UNIVERSITY OF CALIFORNIA College of Engineering Department of Materials Science and Engineering Assigned 11/19/09 Due 12/03/09 Fall 2009 MSE 113 Mechanical Behavior of Materials Prof. Ritchie PROBLEM SET 7 Problem 1 a) List four mechanisms for environmentally assisted cracking and describe each briefly. A steel ship (AISI 4340: σ ys = 215 ksi, K IC = 100 ksi in) which sails between Nova Scotia and New York. During a pre voyage inspection, dock workers notice that some paint has been chipped off the hull by a foreign object during the previous voyage and there is now a small notch and a patch of rust in the bare spot. b) Find the critical crack length assuming that the fracture toughness of the local material is 10 ksi in as a result of being exposed to the environment. c) The crack is on the hull roughly level with the water, so it gets a mix of seawater and air. Illustrate the crack environment in this corrosive environment to describe how the crack might grow. To idealize, assume it is a surface crack of length 2a and depth a into the hull. d) To slow the growth of the crack, the dock workers need to do something. They have a choice of attaching a material to the hull which will preferentially corrode, painting over the spot, or applying a voltage. Pick one solution and discuss the specifics of your choice.
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