TECHNOLOGY Procedure improves line pipe Charpy test interpretation

Michael J. Rosenfeld Kiefner & Associates Inc. Worthington, Ohio The Charpy V-notch (CVN) impact test is a method of characterizing a line-pipe material's notch toughness and resistance to fracture growth. Although CVN testing of line pipe material is routine, test results are sometimes misinterpreted because of specimen size and load rate on actual toughness transition behavior. These effects are readily accounted for by a simple mathematical procedure, offered here, which enables extrapolation of the full-scale transition curve from as little as a single subsize specimen test. This procedure is useful when the toughness transition curve is incomplete or nonexi...

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