ASNT Level III- Visual & Optical Testing
My Level III Self Study Notes Reading 4 Section 4B
My Level III Self Study Notes Reading 4 Section 4B
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5.1.2 Fracture Surface Analysis<br />
The topography of fracture surfaces can be replicated and analyzed using an<br />
optical microscope, scanning electron microscope or transmission electron<br />
microscope. The maximum useful magnification obtained using optical<br />
microscopes depends on the roughness of the fracture but seldom exceeds<br />
100 x . The scanning electron microscope has good depth of field at high<br />
magnifications and is typically used for magnification of 10,000 x or less. The<br />
transmission electron microscope has been used to document microstructural<br />
details up to 50,000 x . In general, scanning electron microscope analysis of a<br />
replica provides information regarding mode of failure and, in most instances,<br />
is sufficient for completion of this kind of analysis.<br />
Charlie Chong/ Fion Zhang