Studies of Residual Stress in Single-Row Countersunk Riveted Lap Joints

Effects of Clearance Fit and Friction Coefficient on Triple-Row Riveted Lap Joints

“…In order to avoid both thermal and inertial effects on the material properties, a small constant load ramp of 111.2 N per second was chosen for all the rivet installations. [15][16][17][18][19] This rate is much slower than that used in the actual riveting process. The three rivets were installed one by one starting from the centre rivet.…”

“…Micro-strain gauges were used to capture the strain variations during the test. [15][16][17][18][19] All the micro-strain gauges pointed in the longitudinal (tensile) direction, as shown in Figure 2. The global coordinate frame origin was set at the middle fastener hole centre.…”

“…After riveting, the lap joints were loaded in tension to a maximum remote stress of 98.6 MPa. 18,19 Rivet driven head deformation and measured strain were used to validate the numerical modeling. Then, a parametric study was carried out using the validated 3D nonlinear finite element methods to address issues that could not be looked into directly in the experimental tests.…”

“…16,17 The effect of the residual stress on the stress variation during tensile loading for countersunk riveted lap joints was successfully studied using 3D FE methods with the aid of relevant experimental tests. 18,19 Both the riveting process and the tensile loading stage were included in these 3D FE analyses. The material elastoplastic constitutive relationship and geometric non-linear properties, as well as nonlinear contact boundary conditions, were included in the numerical models.…”

“…The material elastoplastic constitutive relationship and geometric non-linear properties, as well as nonlinear contact boundary conditions, were included in the numerical models. [16][17][18][19] A literature review [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] showed that there was little quantitative study available on the effect of the clearance fit and friction coefficient on the stress/strain variation in triple-row countersunk riveted lap joints. Furthermore, an accurate numerical analysis of the corrosion pillowing effect on the stress state in lap joints is also needed.…”