Abstract
Ultrasonic force microscope (UFM) has been applied to the detection of subsurface defects in HOPG samples1. The advantages of UFM over the conventional scanning acoustical microscope (SAM) is the capability of nanoresolution for subsurface images, without the wavelength limitation of the SAM. It can visualize the quantum mechanical microscopic processes. In this paper we propose the application of the ultrasonic force microscope (UFM) to study fracture in material. Our paper will concentrate on the interpretation of images, leading to the understanding of the physical process in fracture. This will have application in non-destructive evaluation such as to know how long it takes the turbines of a jet to deteriorate to such an extent that they are dangerous and to design materials that resist mechanical ageing.
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