Abstract
Effects of fastener clearance fit, friction coefficient, and corrosion pillowing on the stress state in triple-row riveted lap joints were studied numerically using three-dimensional finite element methods. The material elastoplastic constitutive relationship and geometric nonlinear properties, as well as nonlinear contact boundary conditions, were included in the numerical simulations. The numerical modeling was validated using experimental measurements of the rivet driven-head deformation and in situ strains. The lap joints were loaded in tension after riveting. Three different clearance fits, three different friction coefficients, and four corrosion-pillowing conditions were analyzed. The stress variations along prescribed paths and full-field contours of the maximum principal stress on joint faying surfaces during the tensile loading stage were investigated. Insightful results of the stress state in riveted lap joints were obtained, which could effectively explain the phenomena observed from joint fatigue tests. The phenomena include 1) the potential major factor to cause the joint fatigue-life scatter, 2) crack-nucleation site location in the top rivet-hole vicinity on the outer-sheet faying surface for the noncorroded joints, and 3) the occurrence of themultiplesite damages in aged and corroded lap joints.
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