Abstract
Tests were performed on single edge notched tension specimens made from a 1% CrMoV high temperature bolting steel. Specimens of constant thickness equal to 23 mm and of widths 25 mm, 15 mm and 8 mm were tested. An analysis based on the Bilby, Cottrell and Swinden-Dugdale model and the load/displacement curves was performed. This gave average toughness values of 94 MNm −3 2 , 105 MNm −3 2 and 127 MNm −3 2 for the 25 mm, 15 mm and 8 mm specimens respectively and an apparent increase in the fracture toughness with decreasing crack size. This implies that K1 c is not a material constant in the post-yield regime.
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