Published: Jan 2005
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EVEN THOUGH THE CHARPY (CVN) BEND BAR IS SMALLER THAN ANY other candidate fracture mechanics specimen, it is being considered for use because it is the most common non-fracture mechanics specimen used in manufacturing and engineering applications. Oftentimes this CVN bar is the only fracture toughness type of specimen inserted into the surveillance capsules of nuclear reactor pressure vessels, and in some cases, the important pre-irradiation or base-line CVN transition curves were not developed. Hence, there is good motivation to determine if valid fracture mechanics-based KJc values can be obtained from the Charpy bar after it has been fatigue pre-cracked into a fracture mechanics configuration. If the effort were successful, it would obviate the need for baseline CVN data to evaluate irradiation damage currently judged by the CVN ΔT curve shift.