Residual stress measurements in laser clad aircraft aluminium alloys
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Date
2015-07-19
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Publisher
ICMS Australasia
Abstract
Fatigue and corrosion damage of structural components threatens the safety and availability of civil and military aircrafts. There is no sign of relief from these threats as civil and military aircrafts worldwide are continuously being pushed further into and past their initial design fatigue lives in tight financial circumstances. Given fatigue and corrosion damage often initiates at the surface and sub-surface of the components, there has been extensive research and development worldwide focused on advanced aircraft repair technologies and surface enhancement methods. The Deep Surface Rolling (DSR) is one of advanced surface enhancement technologies that can introduce deep compressive residual stresses into the surface of aircraft metallic structure to extend its fatigue life. For the development of cost-effective aircraft structural repair technologies such as laser cladding, in this study, aluminium alloy 7075-T651 specimens with simulated corrosion damage were repaired using laser cladding technology. The surface of the laser cladding region was then processed by DSR. The experimental results from subsequent fatigue testing of laser cladded baseline, DSR and post-heat treated laser cladded specimens discovered that the DSR process can significantly increase fatigue life in comparison with the ascladded baseline. The three dimensional residual stresses were measured by neutron diffraction and the results confirmed the beneficial compressive residual stresses at the cladding surface can be achieved in depth more than 1.0 mm.
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Not available online.
Keywords
Aircraft, Aluminium alloys, Cladding, Corrosion fatigue, Neutron diffraction, Repair, Residual stresses
Citation
Zhuang, W., Liu, Q., Djugum, R., Sharp, P. K., & Paradowska, A. (2015). Residual stress measurements in laser clad aircraft aluminium alloys. Paper presented at the 2nd Asia Oceania Conference on Neutron Scattering: AOCNS 2015 : 19-23 July 2015, Novotel Manly Pacific, Sydney.