Abstract
A curved beam specimen, with outer-to-inner radius ratio of 1·31, is investigated for fracture toughness testing of material from cylindrical components. Experimental stress-intensity factor calibrations, obtained from fracture tests and compliance measurements, show good agreement with theoretical data from modified mapping-collocation and finite element analyses, and also with the proposed standard C-shape calibration transposed to satisfy three-point bending conditions. The specimen achieves considerable economy of size over a straight specimen, and can have reduced crack length and width without detriment to its performance. Practical aspects of testing this specimen are considered.
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