Effect of residual stress on the nanoindentation response of aerospace aluminium alloys |
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| Authors: | MK Khan ME Fitzpatrick SV Hainsworth L Edwards |
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| Affiliation: | 1. Materials Engineering, The Open University, Milton Keynes MK7 6AA, UK;2. Department of Engineering, University of Leicester, Leicester LE1 7RH, UK;1. Institute of Process Equipment and Control Engineering, College of Mechanical Engineering Zhejiang University of Technology, Hangzhou 310014, China;2. Institution of Micro/Nano-Mechanical Testing Technology & Application, College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, China;3. Engineering Research Center of Process Equipment and Re-manufacturing, Ministry of Education, Hangzhou, China;1. Institute of Applied Physics and Material Engineering, University of Macau, Macau, China;2. Department of Engineering and System Science, National Tsing Hua University, Hsinchu, Taiwan;1. Laboratory of Nanostructures and Nanomaterials, Institute of Physics, Czech Academy of Sciences, Na Slovance 1999/2, CZ-12821 Praha 8, Czech Republic;2. Division of Materials Science, Faculty of Advanced Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan |
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| Abstract: | Experimental measurements and finite element simulations have been used to study the effect of residual stresses on the nanoindentation response of an aerospace-grade aluminium alloy. Tensile and compressive residual stresses lead to changes in the nanoindentation load–displacement curves. Loading and unloading curves were studied to observe the effect of residual stresses. The maximum load of indentation, curvature of the loading curve, elastically recovered depth, work of indentation, pile-up and contact area were measured and found to have a linear relationship with residual stress. To calculate residual stress from the load–displacement curve, it was concluded that pile-up should be measured carefully. The paper presents a methodology of calculation of area of contact based on the work of indentation which can be extracted from the nanoindentation load–displacement data. This allows extraction of the residual stresses from experimental nanoindentation data for aerospace aluminium alloys which generate pile-up and for which the true calculation of contact area without imaging is very difficult. Methods previously published in the literature have been assessed against the current approach. |
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