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High strength bolts with large diameters are widely used in steel structures from the infrastructure and energy conversion sectors. The brittle fracture behavior of these connections has to be taken into account, especially for structures operating at cold environment, such as the offshore wind energy plant. Generally, two groups of methods are employed for cleavage fracture assessment, i. e., global approaches developed in the fracture mechanics frame and local criteria based on the damage mechanics approach proposed by Beremin. This work aims to determine characteristics of high strength bolt steels in the strength class 10.9 for cleavage fracture assessment. Fracture mechanics tests are conducted to determine the experimental master curves. In addition, numerical approaches are employed to derive the parameters of Beremin model from the master curves.

Determination of global and local cleavage fracture characteristics of high strength bolt steels