PSI - Issue 39

Hithendra Karakampalle et al. / Procedia Structural Integrity 39 (2022) 711–721 Author name / Structural Integrity Procedia 00 (2021) 000–000

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For the crack propagating from one extreme end of the plate to the other, it was found that the values of SIF at the two tips differ marginally Interference at the joints significantly reduced the SIF, with 0.15 percent interference being the most effective, after which SIF increases as interference increases. Considering the SIFs at all crack lengths and crack tips, the maximum beneficial interference that could be provided is 0.15%. In case of cracks starting from the joint at the center of the plate and propagating symmetrically to plate's two extreme joints, 0.1% interference was found to be the most effective level in reducing the SIF with the maximum reduction of around 20% at shorter crack lengths. It was also observed that for a joint with relatively longer crack at higher interference, there exists a cracked joint with shorter crack and lower interference, where the stresses are equal. Existence of neighboring cracks at L1 and L3 increased the SIF for any crack length at L2, with larger neighboring cracks resulting in higher SIF. However, as the crack size at L2 increased, the variation of SIF between the presence and absence of neighboring cracks decreased. With a minor exception, 0.15% interference level yielded the best reduction in SIF, varying from 5% to 14%, depending on the length of crack at L2. The stress levels are also higher at L2 in presence of neighboring cracks and are influenced more by the size of neighboring cracks rather than the size of crack at its location. References Hithendra, K., Prakash, R.V., 2021. A Study of Stress Intensity Factors in Lozenge Pattern of Joints, Paper accepted for publication in the Proceedings of the ASME 2021 International Mechanical Engineering Congress and Exposition (IMECE2021), November 1-5, 2021, Virtual Conference, Online. Lanciotti, A., Polese, C., 2005. T he effect of interference‐fit fasteners on the fatigue life of central hole specimens, Fatigue and Fracture of Engineering Materials and Structures, 28: 587 – 597. Lei, C., Bi, Y., Li, J., Ke, Y., 2017. Effect of riveting parameters on the quality of riveted aircraft structures with slug rivet, Advances in Mechanical Engineering, Sage publications. Liu, J., Zhao, A., Ke, Z., Zhu, Z., Bi, Y., 2020. Influence of Rivet Diameter and Pitch on the Fatigue Performance of Riveted Lap Joints Based on Stress Distribution Analysis, Materials, 13(16):3625. Liu, J., Zhao, A., Ke, Z., Li, Z., Bi, Y., 2020. Investigation on the Residual Stresses and Fatigue Performance of Riveted Single Strap Butt Joints, Materials, 13(15):3436. Pilkey, W.D, 2004. Formulas for stress, strain and structural matrices, 2nd ed., John Wiley and Sons, ISBN 0-471-03221-2. Prakash, R.V., Hithendra, K., 2020. Combined Effect of Loading and Interference Level on Stress Intensity Factor for a Pin Loaded Joint, Proceedings of the ASME 2020 International Mechanical Engineering Congress and Exposition. Volume 12: Mechanics of Solids, Structures, and Fluids. Virtual, Online. November 16–19, 2020, V012T12A046. Sabbaghi, F.S., Rasti, A,, Sadeghi, M.H., Hashemi, K.J., 2018, Investigation of Interference fit and its effect on fatigue life in hardened steel, Modares Mechanical Engineering; 17 (10) :420-428. Szolwinski, M.P., Farris, T.N., 2000. Linking riveting process parameters to the fatigue performance of riveted aircraft structures, Journal of Aircraft, 37: 130–137. Ying, S., Weiping, H., Fei, S., Qingchun, M., Yuanming Xu., 2016. Numerical simulations of the fatigue damage evolution at a fastener hole treated by cold expansion or with interference fit pin, International Journal of Mechanical Sciences, Volume 107, Pages 188-200. Chakherlou, T.N., Mirzajanzadeh, M., Abazadeh, B., Saeedi, K., 2010. An investigation about interference fit effect on improving fatigue life of a holed single plate in joints, European Journal of Mechanics - A/Solids, Volume 29, Issue 4, Pages 675-682.