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Advances in Aircraft and Spacecraft Science Volume 3, Number 1, January 2016 , pages 061-75 DOI: https://doi.org/10.12989/aas.2016.3.1.061 |
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Deformation behaviour of steel/SRPP fibre metal laminate characterised by evolution of surface strains |
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J. Nam, Wesley Cantwell, Raj Das, Adrian Lowe and Shankar Kalyanasundaram
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| Abstract | ||
| Climate changes brought on by human interventions have proved to be more devastating than predicted during the recent decades. Recognition of seriousness of the situation has led regulatory organisations to impose strict targets on allowable carbon dioxide emissions from automotive vehicles. As a possible solution, it has been proposed that Fibre Metal Laminate (FML) system is used to reduce the weight of future vehicles. To facilitate this investigation, FML based on steel and self-reinforced polypropylene was stamp formed into dome shapes under different blank holder forces (BHFs) at room temperature and its forming behaviour analysed. An open-die configuration was used in a hydraulic press so that a 3D photogrammetric measurement system (ARAMIS) could capture real-time surface strains. This paper presents findings on strain evolutions at different points along and at 45o to fibre directions of circular FML blank, through various stages of forming. It was found initiation and rate of deformation varied with distance from the pole, that the mode of deformations range from biaxial stretching at the pole to drawing towards flange region, at decreasing magnitudes away from the pole in general. More uniform strain distribution was observed for the FML compared to that of plain steel and the most significant effects of BHF were its influence on forming depth and level of strain reached before failure. | ||
| Key Words | ||
| fibre metal laminate, real-time strain measurement system, self-reinforced polypropylene, stamp forming | ||
| Address | ||
| J. Nam: Research School of Engineering, Australian National University, 31 North Road, Canberra, ACT 2601, Australia Wesley Cantwell: College of Engineering, University of Liverpool, Brownlow Hill, Liverpool L69 3GJ, United Kingdom Raj Das: Department of Mechanical Engineering, University of Auckland, 20 Symonds St, Auckland, New Zealand Adrian Lowe and Shankar Kalyanasundaram: Research School of Engineering, Australian National University, 31 North Road, Canberra, ACT 2601, Australia | ||
