Affiliation:
1. Defence Science and Technology Organisation
Abstract
LAU-7 missile launcher housings, which are fitted to most Royal Australian Air Force (RAAF) F/A-18A/B aircraft, can experience cracking in the guide rail. This paper covers the design, manufacture and validation of a life extension repair for cracked launcher housings. The repair development uses DSTO's rework shape optimisation technology and fatigue testing capabilities. The rework design reduces peak stresses by 33 %, resulting in significant fatigue life enhancements, as demonstrated by representative coupon testing. A special manufacturing jig has been designed and transitioned to the RAAF, which has used it to repair housings. These housings have performed well in flight tests, with no cracking detected.
Publisher
Trans Tech Publications, Ltd.
Reference5 articles.
1. Heller, M., Calero, J., Barter, S.A., Wescott, R.J. & Choi, J., Fatigue Life Extension Program for LAU-7 Missile Launcher Housings using Rework Shape Optimisation, DSTO-TR-2662, Department of Defence, DSTO, Air Vehicles Division. (2012).
2. M. Heller, M. Burchill, R. Wescott, W. Waldman, R. Kaye, R. Evans, M. McDonald, Airframe Life Extension by Optimised Shape Reworking – Overview of DSTO Developments, 25th ICAF Symposium, Rotterdam, 27–29 May (2009).
3. Wescott, R. & Heller, M., Transforming Stress Optimal Free Form Shapes for Improved Numerically Controlled Manufacture, DSTO-RR-0340, Department of Defence, DSTO, Air Vehicles Division, (2009).
4. Barter, S.A. & Wanhill, R. J. H., Marker Loads for Quantitative Fractography (QF) of Fatigue Cracking in Aerospace Alloys, 25th Symposium of the International Committee on Aeronautical Fatigue, Rotterdam, The Netherlands, 27-29 May (2009).
5. Heller, M., Calero, J., Barter, S., Wescott, R.J. & Choi, J., (in preparation), Application of Customised Cold Rolling to Optimised Rework Repair of LAU-7 Missile Launcher Housings, DSTO-TN-xxxx, Department of Defence, DSTO, Aerospace Division, (2013).
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1 articles.
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