Report of Findings: Engineering Practices Study on Failure Analysis of NSN 5340-00-136-9872 Grooved Coupling Clamp

摘要

Failure analysis of an aircraft exhaust pipe clamp indicated that the clamp material was significantly and seriously outside the specification requirements and that the clamp failed in stress corrosion mode. Non-compliance with the material requirements was the most important factor in the formation and subsequent propagation of stress corrosion cracks. Improved inspection requirements and consideration of a material with greater resistance to stress corrosion cracking are recommended. Keywords: Clamp, Failure analysis, Stainless steel, Stress corrosion, Fastenings. (jes)