Abstract
Among the different causes of pipe failures, fatigue cracking has to be considered in any design program. Since the integrity of nuclear reactor piping is of particular importance, an AEC pipe study program includes a task to assess quantitatively the crack propagation rate through pipes for cracks originating at surface flaws. This problem has been attacked theoretically by the use of fracture mechanics, and practically by striation measurements on fracture surfaces produced by full-scale bending fatigue tests. This paper deals with the practical aspect of applying electron microfractography to such fractures as a means to determine crack propagation rates in pipes of different dimensions and materials, and with different flaw locations.Six-inch diameter pipes with a wall thickness of 7.5, 10.8, or 18 mm were notched inside or outside and failed in reverse bending fatigue by growing a crack through the wall thickness. The crack front was marked at intervals by reducing the strain amplitude for a number of cycles.
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Schedule a callMore From: Proceedings, annual meeting, Electron Microscopy Society of America
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