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Characterization of fatigue-induced free volume changes in a bulk metallic glass using positron annihilation spectroscopy
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19.The stress-intensity factor is a global parameter which fully characterizes the local stress and deformation fields in the immediate vicinity of a crack tip in a linear-elastic solid, and thus can be used to correlate to the extent of crack advance. It is defined for a crack of length as , where is the applied stress and is a geometry factor of order unity. The stress intensity range is simply the difference between the maximum and minimum stress intensities applied to the specimen during each loading cycle.
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