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A number of years ago δ5 was introduced as an experimental technique for determining the crack tip opening displacement. Experience gained since then has confirmed that δ5 can be used as an operational definition of the CTOD which has the advantage that due to its direct measurement without the need of calibration functions, it can be measured on any cracked part, be it a test specimen or a structural component. In the case of bend bars δ5 is closely linked to standardised test methods. It is also shown that δ5 is uniquely related to the J-integral and that it can be predicted as a driving force parameter with the Engineering Treatment Model, allowing the use of δ5 in flaw assessments.
Crack tip opening displacement, flaw assessment, J-integral, Engineering Treatment Model
Director, Institute of Materials Research, GKSS Research Center, Geesthacht,