Fractal in Fatigue Fractography

Abstract

Abstract: Fracture profile roughnesses and fractal dimensions of fracture traces were measured on a fatigued Ti-6Al-4V alloy.It is found that although fractal dimension can well reflect the variation of fracture traces with the measuring units,it is difficult to apply it to quantitative analysis of fractured surfaces because of the dependence of the meas- ured profile roughness on the measuring units.Based on fractal concept.an alternative equation lgR_l(η)=lgR_o-(D-1)lgη was obtained.in which we intro- duced a parameter of intrinsic profile roughness to evalu- ate fracture profile roughness without restriction of the measuring units employed.

Key words: fatigue, fractal dimension, fracture profile roughness

YANG Jingjun ZHOU Xiangyang KE Wei Institute of Corrosion and Protection of Metals,Academia Sinica,Shenyang 110015,China.. Fractal in Fatigue Fractography[J]. J Mater Sci Technol, 1990, 6(2): 112-116.

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Fractal in Fatigue Fractography

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