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VOCALIST Report Summary

Project ID: FIKS-CT-2000-00090
Funded under: FP5-EAECTP C
Country: Finland

Correlation between Master Curve transition temperature and crack-tip constraint parameters

VOCALIST has provided validation of the procedure whereby the effects of crack-tip constraint loss on cleavage fracture toughness may assessed by comparing To values determined from deep-notch specimens with non-standard To values determined from shallow-notch fracture toughness specimens. Data obtained within VOCALIST lend support to the shape of the Master Curve being constraint independent, at least for temperatures in the range -50° < (T - To) < 50°C.

The classical two-parameter constraint-based fracture mechanics methodology was integrated with the Master Curve and local approach descriptions of cleavage toughness to describe cleavage fracture behaviour in Features and Benchmark tests.

The usefulness of correlating the Master Curve reference temperature, To, with the crack-tip constraint parameter, Q, has been demonstrated; however, the trend curves derived require further development and validation before they can be used in fracture analyses.

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Reported by

Technical Research Centre of Finland
Kemistintie 3
02044 VTT Espoo
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