Abstract
This paper discussed the fracture mechanism of diamond like carbon (DLC) film subjected to contact loading. The DLC films with over 10μm thick were deposited onto stainless steel (SUS304). Rockwell indentation tests with simultaneous monitoring of acoustic emission (AE) and corrosion potential fluctuation (CPF) techniques were applied to the DLC films to clarify the mechanism of contact fracture. The DLC films were found to produce spiral crack morphology. This crack was found to be produced under unloading process detected by AE and CPF analyses. Due to this plastic strain which were suggested by Finite element analysis, the film buckling occurred under unloading process and resulted in the delamination and the spiral crack. Rockwell indentation method with AE and CPF monitoring system could determine the onset of film fracture, which enabled us to discuss the detailed fracture mechanism.
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