Corrosion and Load Transfer Effects on Fatigue of Mechanically Fastened Joints. Fatigue of Zero Load Transfer Specimen

摘要

This IR program studies the effects of load transfer and corrosive environment on fatigue of mechanically fastened joints. As an initial part of the program, the fatigue crack initiation and growth, and the final fracture in zero load transfer specimens of 7475-T7351 aluminum alloy were investigated. The applied stress range was related to the fatigue crack initiation life Ni and the total fatigue Nf by empirical equations. The variation of fatigue crack growth rate with stress intensity factor range was defined. The proportion of fatigue crack initiation an growth lives was determined as a function of the stress range and the total fatigue life.