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The embrittlement of production hardware due to the introduction of hydrogen into the hardware as a side effect of normal production processes, such as the plating of parts, has been a long-standing concern. Present nondestructive proof test methods cannot be used to individually qualify suspect parts since the excessive test loads may actually microscopically damage the hardware, rendering it unsafe for in-service applications. A proof test logic, applied to each piece of hardware, is offered based on fracture mechanics concepts to insure 100% reliability of the hardware for in-service applications. The proof test logic is proposed, and the efficacy of its implementation is examined by following the events of an actual case study.
proof test logic, hydrogen embrittlement, ASTM Standard F 519, Charpy impact energy, dynamic toughness, rising step load, subcritical crack growth, threshold stress intensity, critical crack size
Krams, William E.
Senior consultant, L. Raymond & Associates, Irvine, CA