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Queen Mary University of LondonQueen Mary University of London
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School of Engineering and Materials Science
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PhD Thesis: Micrometre-scale plasticity size effects in metals and ceramics theory and experiment

Author: ZHU, Tingting

Year: 2009

Supervisor(s): Andy Bushby

This thesis comprises studies of size effects in the plasticity of metals and ceramics at length scales of the order of micrometres and includes both experimental work and theoretical development. Experimental results are presented for foil flexure (nickel and copper) and nanoindentation (ceramics and hard metals). These studies were conducted because existing data does not cover a range broad enough or with sufficient precision to test various theories.

With the developed bending technique, more accurate data is obtained covering a wide range of strain, especially around the key region of the elastic-plastic transition. Moreover, the interaction between grain and thickness size effect is successfully studied by varying the ratio of grain size over the thickness of the foils.