Transcription of Avoiding knife-edge countersinks in GLARE through …
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Avoiding knife-edge countersinks in GLARE through …
Page 1 of 21 Avoiding knife -edge countersinks in GLARE through dimpling Submitted to Fatigue and Fracture of Engineering Materials and Structures on March 4, 2004 C. Rans*, Straznicky Department of Mechanical and Aerospace Engineering Carleton University 1125 Colonel By Drive Ottawa, Ontario, Canada, K1S 5B6 ABSTRACT Traditional machine countersinking practices create a knife -edge condition in one or more of the outer aluminum layers in riveted GLARE joints. Press countersinking ( dimpling ) provides an alternative method of countersinking that prevents the formation of a knife -edge; however, its application and potential benefits to fatigue performance in GLARE are not known. This paper investigates the dimple forming process and its application to GLARE , and the resulting benefits in fatigue crack initiation life in unfilled rivet holes.
Page 6 of 21 3.1 Test Set-up Dimpling was performed on 6.0″x1.5″ GLARE 3-2/1 strip with 0.1285″ diameter (#30 drill) rivet hole centred on the strip.
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