13th International Conference on Fracture June 16–21, 2013, Beijing, China -4- 3. Comparison with the Test Results. Tests were performed to compare this two kinds of structures in tensile load. Six panels consist of three riveted stringer panels and three welded panels were tested by MTS, and the results are shown in Table.2. Two of riveted stringer panels were destroyed in rivet holes on one side and the other one is destroyed in the middle row of rivet holes, the welded panels are all destroyed in welded areas. These results can be used as validation of the numerical simulation. Table.2 Testing and simulation results Simulation Result Number Failure Position High Stress Area Riveted panel 1 Left holes Around holes 2 Left holes 3 Middle holes Welded panel 1 Left weld Welded areas 2 Middle weld 3 Middle weld 4. Summary In this study, the main conclusions are (1) A more uniform stress distribution in welded panel than riveted stringer panel under the same applied stress, the sample joint with friction stir welding avoids the stress concentration in junctions. (2) The tensile strength of welded structure is higher than riveted stringer structure in certain situation. References [1] Aidy Ali, M.W.Brown, C.A.Rodopoulos, Modelling of crack coalescence in 2024-T351 Al alloy friction stir welded joints, International Journal Fatigue 30(2008)2030-2043. [2] Zhang Hong Wu, Zhang Zhao, Chen Jin Tao, Finite element simulation of friction stir welding process, Transactions of the china welding institution, Vol.26, No.9, September 2005. [3] Dinaharan, N.Murugan, Effect of friction stir welding on microstructure, mechanical and wear properties of AA6061/ ZrB2 in situ cast composites, Materials Science and Engineering A, 543(2012)257-266. [4] Weifeng Xu, Jinhe Liu, Hongqiang Zhu, Analysis of residual stresses in thick aluminum friction stir welded butt joints, Materials and Design 32(2011)2000-2005.
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