Method, apparatus and computer program product for...

Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Mechanical measurement system

Reexamination Certificate

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C702S042000, C702S184000

Reexamination Certificate

active

07433789

ABSTRACT:
A method, apparatus and computer program product are provided in which information identifying a stress/strain range cycle and the time duration of the stress/strain range cycle associated with the component is received. The maintenance value based upon the actual service life expended during the stress/strain range cycle and the time duration of the stress/strain range cycle is then determined. As such, the component need not be prematurely retired and appropriate compensation or other accounting may be provided for the effective extension in the service life of the component. The determination of the maintenance value may be based on the time duration of the stress/strain range cycle, a residual lifetime and a total number of life cycles for the identified stress/strain range cycle. The retirement of a component may also be recommended in certain instances.

REFERENCES:
patent: 4046002 (1977-09-01), Murphy et al.
patent: 4336595 (1982-06-01), Adams et al.
patent: 6618654 (2003-09-01), Zaat
patent: 6968293 (2005-11-01), Wiegand
patent: 7197430 (2007-03-01), Jacques et al.
patent: 2007/0295098 (2007-12-01), Balestra
U.S. Appl. No. 11/473,418, filed Jun. 22, 2006, Balestra.
U.S. Appl. No. 11/697,661, filed Apr. 6, 2007, Balestra.
Richard W. Hertzberg, Stress Fluctuation, Cumulative Damage, and Safe-Life Design,Deformation And Fracture Mechanics Of Engineering Materials, Fourth Edition, 1996, pp. 532-534, John Wiley & Sons, Inc.
Norman E. Dowling, The Palmgren-Miner Rule,Mechanical Behavior Of Materials, Engineering Methods For Deformation, Fracture, And Fatigue, Second Edition, 1999, pp. 401-402, Prentice Hall.
Army Material Maintenance Policy, Army Regulation 750-1, major revision Jul. 15, 2005.
A DOD Initiative, Condition-Based Maintenance Plus, 2005.

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