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2000
Conference Paper
Titel
Application of single specimen methods on instrumented charpy tests
Titel Supplements
Results of a DVM round robin exercise
Abstract
Based on a previous round-robin exercise of the German DVM task group on `Instrumented Impact Testing' with about 400 instrumented Charpy-specimens being tested, another exercise was performed to explore the possibilities of extended evaluations such as single-specimen methods. The previously determined multi-specimen cleavage JR-curve serves as a reference. Different methods - e.g., the key-curve method - were applied. Overall, the results are encouraging and the agreement of the calculated JR-curve with reference data is quite good especially for large amounts of crack extension. There was some uncertainty left in the first part of the JR-curve, where notch blunting and initiation of crack growth take place, and where the calculated curves tend to overestimate the crack resistance. Results of a new `blind' round-robin indicate improved results in this initial part of the JR-curve.