Abstract
This work addresses an experimental investigation on the effects of increased span on the cleavage fracture behavior for an ASTM A572 high strength, low alloy structural steel using non-standard PCVN configuration. Fracture toughness testing conducted on PCVN specimen configurations with varying specimen span provides the cleavage fracture toughness in terms of the J-integral at cleavage instability, Jc. The experimental results show a rather marked effect of increased span on Jc-values which can help to mitigate the effects of constraint loss commonly observed in PCVN specimens. An exploratory application to evaluate the reference temperature, T0, based on the Master Curve methodology also provides additional support for using non-standard PCVN specimens in routine procedures to assess fracture toughness behavior of ferritic materials.
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