Failure Analysis and Design of Cu-Be Alloy Clips

F Schmidt
2009 Microscopy and Microanalysis  
An investigation of clip failures attributed mainly to premature corrosion fatigue, has been made on Cu -1.92% Be alloy (CDA-172) case clips. The failures were determined to be caused by three factors: (a) excessive localized tensile stresses in the fork area between spring tines, Figure A; (b) microstructure and over-aging of the associated heat treatment, RHC 38-42, Figures D, E, and F for various aging conditions; and (c) crack initiation locations (side and fork regions), Figure B , and
more » ... Figure B , and fractography, Figure C . Improvement of each of these three factors eliminated the very short service life. Design modifications were made that resulted in a significant cost reduction, and illustrates the value added of a complete design review in addition to simply conducting a root cause failure analysis.
doi:10.1017/s1431927609094847 fatcat:3yho7h37abbzpkqig3vn3tamym