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An experimental procedure is described for precracking and computerized single-specimen JIc testing of irradiated three-point bend specimens. The specimens were automatically precracked in cantilever bending at constant deflection. The JIc values determined by the single-specimen unloading compliance technique were found to be in close agreement with multiple-specimen values. The JIc testing system comprised a three-point bend fixture and a furnace mounted on a screw-driven Instron testing machine, a Hewlett-Packard computer, and a data acquisition system. This procedure was found to be successful and cost effective in precracking and JIc testing of the irradiated specimens.
automated precracking, cantilever bending, crack propagation, three-point bend specimens, J-integral, unloading compliance, irradiated specimens
Development staff member, Oak Ridge National Laboratory, Oak Ridge, TN
Engineer, Idaho National Engineering Laboratory, Idaho Falls, ID