Time-evolving statistics of cavitation damage on metallic surfaces.
The statistics of surface damage on polycrystalline aluminium plates caused by acoustic cavitation is studied experimentally as a function of time. Cavitation is shown to produce a uniform distribution of crater-like holes with different depth, area and eccentricity. Most notably, the size distribution of such craters evolves with time from a gamma function into a power law. By contrast, on the surface of a martensitic Cu-Ni-Al crystal cavitation damage generates ramified patterns, reminiscent of a fractal object.
Diodati
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P
Dipartimento di Fisica, Instituto Nazionale per la Fisica della Materia, Universitá di Perugia, I-06123 Perugia, Italy.
Marchesoni
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F
D000162:Acoustics; D000465:Algorithms; D000535:Aluminum; D003300:Copper; D017709:Fractals; D009532:Nickel; D013010:Sonication / Q000009:adverse effects*; D013997:Time Factors; D014465:Ultrasonics / Q000009:adverse effects*
D003300:Copper; D009532:Nickel; D000535:Aluminum