Published: Jan 1986
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Mechanically fastened joints are highly susceptible to fatigue cracking especially when varying loads are applied. The fatigue cracking is influenced by load transfer through fasteners.
Tests were conducted using zero, low, medium, and high load transfer specimens of 7475-T7351 aluminum. The fatigue crack initiation and growth and the final fracture behaviors were investigated. The fatigue crack initiation life, Ni, and the total fatigue life, Nf, are reduced by increasing stress range, Δσ, and load transfer level, L. The relationship is defined by the equations of the form
mechanically fastened joints, load transfer, constant amplitude loading, fatigue, stress ratio, stress range, frequency, crack initiation, crack growth, fatigue life
Materials engineer, Naval Air Development Center, Warminster, PA