Fracture experiments conducted as part of research on stable crack behavior in low alloy steel (EN 34NiCrMo6) are analyzed and presented. CT specimens of low constraint (section slenderness ratio, b0/B ∼ 6), with various crack depth and different loading angles, ϕ, were investigated. Analysis of the load displacement curves revealed that the initiation load is found to be the same when normalized to the maximum load, Pmax. The load-line displacement ΔLL at Pmax (ΔPmax) was also found to have a single value. Hence the load displacement curves were presented as a unique normalized P–ΔLL curve. These normalized curves demonstrate having a single “representative/trend” curve that characterises the stable crack growth behavior. The proposed normalization technique was also applied to additional literature data on different materials with various specimen configurations and loading modes with success. This technique could also be useful in studying the fracture of low constraint specimens and contributing to the transferability issue for structural application.
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