Abstract
Use of a precracked and side-grooved Charpy-size specimen is an economical and convenient single-specimen method of evaluating the elastic-plastic fracture toughness of nuclear pressure vessel steels. This paper has studied the influence of side-groove depth on fracture toughness and stable increment of crack on several pressure vessel steels in detail. Test results are compared with those of large-size specimens which the National Standard of China (i.e. GB 2038) requires. The research results indicate that using a precracked Charpy-size specimen with side-groove depth 30% and adopting the energy before the maximum load of a three-point bending test curve, the elastic-plastic fracture toughness of materials can be evaluated conservatively when the crack begins to propagate, and the reasonable design of a Charpy-size specimen for fracture toughness tests in nuclear surveillance has been established. At the same time, the constraint effect and thickening action of the side-groove on a Charpy-size specimen have also been discussed, and theoretically explained.
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