The round double beam loaded in eccentric compression has been shown to produce usable data when determining the fracture properties of materials with a relatively large characteristic length. In order to reduce these data, the geometry calibration factor must be known for the combination of specimen geometry and loading technique. Numerical simulations using the boundary element method have been used to determine the geometry calibration factor for a round double beam with a length to diameter ratio of 2:1 loaded in eccentric compression. The factor was determined by compliance calibration and direct calculation of stress intensities. Recognizing that laboratory test specimens will not have exactly the same geometry as the simulated specimen, geometry calibration factors have been determined for variations in the base geometry as well.
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