Retrieving Effective Stress Spectrum of Fatigued Components from Fractographic Quantitative Analysis

摘要

Under the constant amplitude and pro-grammed loading conditions the fatigued fracturesurfaces of 2024-T3 sheet are examined by SEMand TEM.A corrected method,in which the effectsof loading sequence are taken into account,hasbeen developed for the retrieval of effective stressspectrum.The parameters including d,a,C,n,R,αand σ_y are evaluated according to their influenceson the retrieved results.Several computer programshave been produced for the fractographic quantita-tive analysis,and the application of image pro-cessing technique in the fractographic analysis is al-so interpreted.