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Specimen Thickness Effects for Elastic-Plastic CTOD Toughness of an A36 Steel

This paper describes the results of an experimental and analytical study of the effect of specimen size on the fracture-toughness behavior of A36 steel, primarily in the lower-transition region. This region is beyond the limits of plane-strain as defined by ASTM E-399, but in the region where failure occurs prior to any macroscopic fibrous tearing. Experimental results were obtained using Crack-Tip Opening Displacement (CTOD) three-point bend specimens and analytical results were obtained using a 3-D elastic-plastic finite-element analysis. Two specimen sizes, full thickness (31.8 mm (1.25'') thick) and reduced thickness (12.7 mm (0.50'') thick), were investigated using the preferred t x 2t x 8t specimen size.