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The Master Curve method, developed for brittle fracture initiation estimation, has enabled a consistent analysis of fracture initiation toughness data. The method has been modified to also describe crack arrest toughness. Here, this “crack arrest master curve” is further validated and used to develop a simple, but yet adequately accurate correlation between the two fracture toughness parameters. The correlation enables the estimation of crack arrest toughness from small Charpy-sized static fracture toughness tests.
If a more accurate description of the crack arrest toughness is required, it can either be measured experimentally or estimated from instrumented Charpy-V crack arrest load information.
crack-arrest, brittle fracture, fracture toughness testing, correlation, master curve
Research professor, VTT Manufacturing Technology,