Abstract
This study involves the R effect and environment effect on crack closure mode, in 7175 T 651 aluminium alloy. To obtain one of the selected objectives, it was necessary to use a clip gauge located at the notch of the compact specimen and a C.T.O.D. gauge located at the crack tip. The crack opening phenomena observed in our tests depends on the applied method which accounts for the differences in ΔK eff found in the literature. The systematic use of the two methods allowed us to bring to light common features permitting the calculation of ΔK eff according to Elber's criteria. The concept of ΔK eff does not fully explain the influence of R ratio and the environment effect.
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