Fatigue behavior of aluminum 5754-O and 6111-T4 spot friction welds in lap-shear specimens

Fatigue analyses of self-piercing rivets and clinch joints in lap-shear specimens of aluminum sheets

“…The self-piercing rivets and clinch joints fail finally through the circumferential/transverse crack growth in the upper sheets and inner bottom crack growth, respectively. Next, the structural stress model based on the Kirchoff plate theory as discussed in Tran et al [24] and Tran and Pan [25] is adopted to estimate the fatigue lives of the joints. The closed-form structural stress solutions at the crack initiation locations of self-piercing rivets and clinch joints and the experimental stress-life data for aluminum 6111-T4 sheets are adopted to estimate the fatigue lives.…”

“…It should be emphasized that the authors mentioned above used the structural stresses to estimate the stress intensity factor solutions at the critical locations of spot welds to correlate with the experimental results under cyclic loading conditions. Recently, Tran et al [24,33] and Tran and Pan [25] presented a structural stress model based on the closed-form structural stress solutions at the critical locations of the joints and the experimental stress-life fatigue data to estimate the fatigue lives of spot welds in lap-shear specimens.…”

“…Their estimated fatigue lives are in good agreement with the experimental results under high cycle loading conditions. In this study, the structural stress model of Tran et al [24] and Tran and Pan [25] based on the closed-form structural stress solutions at the crack initiation locations of joints is considered to estimate the fatigue lives of self-piercing rivets and clinch joints.…”

Fatigue and fracture of friction stir linear welded dissimilar aluminum-to-magnesium alloys

“…The other work on the fatigue behavior of dissimilar friction stir welded joints is largely based on the joining of dissimilar aluminum-to-aluminum alloys [31][32][33][34][35][36]. In light of the above-mentioned encouraging quasi-static results, for which the adverse effects of the IMCs seem to have been minimized, this work aims to study the fatigue life of friction stir linear welded (FSLW) aluminum-to-magnesium alloys.…”

Geometric functions of stress intensity factor solutions for spot welds in U-shape specimens

“…Therefore, consideration of the geometric functions for stress intensity factor solutions can be useful to examine the existing fatigue data for spot welds in U-shape specimens of various dimensions. The use of the stress intensity factor solutions to predict the fatigue lives of spot welds has been addressed in Newman and Dowling (1998), Lin and Pan (2004), Lin et al (2006), Lin et al (2008a,b) and Tran et al (2008) for fatigue life prediction of resistance spot welds and friction stir spot welds in lap-shear specimens. Table 7 Values of F I for t/a, W/a, L/a, H/a, and r/a of Ut, ChS and ChL specimens.…”