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(a) Low magnification of a NW and the enlarged image of its root in the inset. [(b)–(d)] Selected frames of a video recording the NW subjected to different deflections indicated by black arrows in (b) and (c), and finally fractured with the fracture surface marked with a white arrow in (e). Scale bar represents .
(Color online) (a) Illustration of a deflected NW and stress/strain distribution in the NW cross section derived from three dimensional FEAs. In the FE simulation a lateral follower force is assumed. The insert shows the refined contours in an enlarged image near the root. (b) The effects of aspect ratio and the fillet radius on the obtained maximum strain derived from FEAs compared to that from beam theory . The simulated NWs have the typical cone-shaped root illustrated in (a).
Obtained fracture strains of ZnO NWs based on beam theory and results from three dimensional FE simulations .
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