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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 1989, Vol. 10 ›› Issue (12): 666-670.

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A METHOD OF THREE-PARAMETER POWER FUNCTION FOR FITTING a-N(a-t)CURVE

Fu Huimin, Gao Zhentong   

  1. Beijing University of Aeronautics and Astronautics
  • Received:1988-06-18 Revised:1900-01-01 Online:1989-12-25 Published:1989-12-25

Abstract:

A method of three-parameter power function for fitting a-N (a-t) curve is presented in this paper. With the method a linear relationship between logN and log (a-a0) from test data of a-N (a-t) curve can be found and many fatigue tests of metallic materials aer reduced.

Key words: curve, da/dN-&Delta, N curve, durability design, damage tolerant design