A procedure to account for overlapping in pitting tests
Résumé
An experimental methodology for cavitation damage measurements based on a 3D laser profilometry technique has been developed by the LEGI and EDF (Electricité de France-R&D Division) [1,2]. Previous works pointed out the strong influence of the test duration and the analysis cutoff parameters (related to the measurement resolution threshold) on the evaluation of the volume damage rate "Vd" and of the pit number rate "Nd" obtained experimentally during the incubation time of the cavitation erosion mechanism. In order to evaluate and rectify the influence of the test duration on the cavitation damage measurements, a software was developed to simulate the generation of cavitation impacts on a solid surface. From a single reference test concerning a material, a given cavitation condition and a test duration, the software predicts the damage of other materials exposed during different durations to the same cavitating flow. Numerical simulations were compared to experimental results observed on some sample surfaces (copper and aluminum) damaged in the EDF Modulab test loop under different flow conditions.
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