Browsing by Author "Toparli, M. Burak"

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Citation - WoS: 2
Citation - Scopus: 2
Determination of the Critical Socket Depths of 10.9 and 8.8 Grade M8 Bolts With Hexagonal Socket Form
(Pergamon-Elsevier Science Ltd, 2019) Tanrikulu, Baris; Toparli, M. Burak; Kilincdemir, Emrah; Yurtdas, Sezgin; Ince, Umut
In this work, the effect of various socket depths of fasteners was investigated for the sake of weight reduction. M8x1.25 x 50 Full Thread (FT) bolts with 10.9 and 8.8 grade were examined in detail. The finite element simulations were performed by using SIMUFACT Forming Software. Empirical studies including fatigue and torque-tension experiments were conducted with the bolts having various socket depths. In addition, the effect of washer as used in most assembly conditions was investigated. One of the analytical methods used in the literature was also employed to compare the results obtained by the numerical and experimental methods. Based on the results obtained in this study, critical socket depths leading to the shift of failures from the thread region to head region were obtained for the investigated M8x1.25 x 50 FT bolts with 10.9 and 8.8 grades. The experimental results were compared with the analytical model and found that the analytical model underestimated the critical socket depths for both 10.9 and 8.8 grade bolts.
Citation - WoS: 14
Citation - Scopus: 16
Effect of Overlapping of Peen Spots on Residual Stresses in Laser-Peened Aluminium Sheets
(Springer, 2019) Toparli, M. Burak; Fitzpatrick, Michael E.
In this study, two different laser peening systems were employed to investigate the effect of overlapping on the resulting residual stress fields. For each laser peening system, 2.0-mm-thick aluminium sheets were laser peened with different amounts of overlapping. The residual stresses after laser peening were measured by incremental hole drilling. It was shown for both laser peening systems, that an increase in amount of overlapping induced higher magnitude compressive and deeper residual stress fields.
Citation - WoS: 1
Citation - Scopus: 1
A New Analytical Model To Estimate Maximum Internal Socket Depth of Non-Reduced Strength Bolts
(Elsevier, 2020) Kocaturk, Fatih; Toparli, M. Burak; Tanrikulu, Baris; Ince, Umut; Kilicaslan, Cenk
In this study, an analytical model for calculation of the maximum socket depth of bolts having shaft diameter smaller than socket diameter was introduced. A representative bolt was chosen and maximum socket depth satisfying the minimum ultimate tensile strength was calculated by the developed analytical model. The analytical findings were also compared with numerical simulations for validation. Numerical studies were carried out by using Simufact.forming finite element software. The maximum socket depth estimated by using the developed analytical model was in good agreement with the numerical results. The obtained critical socket depth through the analytical model was 1.4% safer compared to numerical simulation results. Therefore, it was concluded that the developed analytical model could be used to estimate the critical socket depths of bolts having shaft diameter smaller than socket diameter. (C) 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo