Patent ID: 6612181
Filing Date: 2003-09-02
Classification: G01N

Abstract:
A method for determining crack nucleation (Ni) for a part subject to fretting fatigue, comprising the steps of:A) performing at least one fretting fatigue test on at least one test specimen, wherein said at least one test specimen is comprised of material similar to said part, B) analyzing said at least one fretting fatigue test to determine a variation of stress intensity factor as a function of time (Q{N}) for said at least one test specimen, C) determining a relationship between said stress intensity factor as a function of time (Q{N}) and said crack nucleation (Ni) for said at least one test specimen, and D) determining a variation of stress intensity factor as a function of time (Q{N}) for said part under operating conditions and loads of said part, E) corresponding said variation of stress intensity factor as a function of time (Q{N}) for said part to said variation of stress intensity factor as a function of time (Q{N}) for said at least one test specimen to determine a crack nucleation (Ni) for said part.