1122Learning from the Past

Our prediction of the future performance of materials under specific operating conditions is often based upon previous past experience. However, what is often not appreciated is that a specified material can exhibit an entirely different performance as a result of its' manufacturing history and the nature of the design

(see Section 11.9). Examples of galvanic (or bimetallic) corrosion are littered throughout the marine industry, ranging from loss of hull sheeting on frigates, steel bolt failures on copper end plates, to magnesium alloy wheel failures on jump jet harriers [4]. Such failures were predictable, and the risk of these failures could have been minimized by the application of existing knowledge. Similar examples can be found in the automotive, power, construction, and chemical industries [5-7].

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