Abstract

This report presents the results of a round-robin work on the fatigue crack arrest threshold (ΔKth) of 2618 aluminium alloy and AISI 316 steel. The main purpose was to develop a method for the determination of ΔKth, and to examine the influence of various test parameters on this threshold. Among the parameters considered, only the load ratio (R) and the environment (vacuum) appear to have a significant influence on very slow fatigue crack growth rates (FCGR). Moreover, while the results obtained with the 316 steel show a great scatter, the importance of the adopted procedure is pointed out.

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