Unloading-Compliance and Load-Drop Analysis of J sub Ic Test of Irradiated 348 Stainless Steel.
Final technical rept.,
ARMY ARMAMENT RESEARCH, DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET WEAPONS LAB
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Procedures for determining J integral fracture toughness were applied to load versus load-line displacement data from a series of three point bend specimens of irradiated 348 stainless steel tested at 23 C and 427 C. ASTM Method E813 for J sub Ic was emphasized, using both unloading-compliance and load-drop measures of crack growth. An effective modulus procedure was included in the unloading compliance method using recently published load line displacement results. Two procedures were used for calculating J sub Ic from the J versus unloading compliance crack growth plots the linear fit procedure from E813 and a power law fit with a 0.2 mm offset value of J sub Ic. Based on the results of these various procedures, conclusions were reached regarding the most consistent measures of fracture toughness from these data. Suggestions were given regarding the use of effective modulus with unloading compliance measurement of crack growth and the limitations of the load drop method for measuring crack growth.
- Metallurgy and Metallography