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New experimental test of strain-gradient plasticity theory: metal foil sandwich structures in flexure |
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| Authors: | DJ Dunstan AJ Thomas I de Lavau JJ Jardin AJ Bushby |
| Institution: | 1. School of Physics and Astronomy, Queen Mary University of London , London E1 4NS , England, UK d.dunstan@qmul.ac.uk;3. Ecole d’Ingénieurs CESI, 93 boulevard de la Seine, BP 602 , 92006 Nanterre Cedex , France;4. School of Engineering and Materials Science, Queen Mary University of London , London E1 4NS , England, UK |
| Abstract: | Experimental tests of strain-gradient plasticity theory rely on studies of the size effect (smaller is stronger) in micromechanical testing. The plastic strain gradient is varied by varying the size of the specimen. This confounds the direct effects of the size and the effects of the strain gradient. We propose experiments on foil sandwich structures in which these parameters are separated. Preliminary results suggest that it is the foil thickness that determines the strength, not the strain gradient. |
| Keywords: | bending test nickel plastic deformation strain gradient plasticity size effect |