Effect of a strengthening patch on safe life of an aircraft in a fleet

Dash, PK (1986) Effect of a strengthening patch on safe life of an aircraft in a fleet. Technical Report. National Aeronautical Laboratory, Bangalore, India.

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    The effect of a strengthening patch applied at a fatigue critical area during service on the safe life of an aircraft in a fleet is studied.13; 13; The safe life defined as the life corresponding to a failure probability of 0.OO1 is obtained from the probability density function of fatigue life. This probabilistic description is derived by randomizing a S-N type relation valid for an aircraft under service loading.13; 13; Major sources of variability contributing to scatter in fatigue life are included in the analysis. They appear as13; parameters in the expression for fatigue life. The contributions of these sources to the variability in fatigue life are analysed.13; 13; Application of a strengthening patch at a critical area13; during service enhances fatigue life by reducing the local13; area stress, variability in the effectiveness of the patch in reducing the local area stress has a significant effect on the enhancement in safe life that can be achieved. The13; stage in service life at which the strengthening patch is13; applied is also an important factor affecting the safe fatigue life. The influences of these factors are analysed.

    Item Type: Proj.Doc/Technical Report (Technical Report)
    Uncontrolled Keywords: Fatigue;Spectrum load;Probability distribution;Safe life;Strengthening patch;Service monitoring
    Subjects: AERONAUTICS > Aeronautics (General)
    Division/Department: Materials Science Division
    Depositing User: Mr. Ravikumar R
    Date Deposited: 25 Jul 2006
    Last Modified: 24 May 2010 09:47
    URI: http://nal-ir.nal.res.in/id/eprint/2302

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