PSI - Issue 42

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ Structural Integrity Procedia 00 (2019) 000 – 000

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ScienceDirect

Procedia Structural Integrity 42 (2022) 1206–1214

© 2022 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 scientific committee of the 23 European Conference on Fracture – ECF23 Abstract The analytical formulation introduced for the estimation of the maximum depth of the socket of the bolts that have a shaft diameter smaller than the diameter of the socket was validated with experimental studies. The maximum socket depth of a chosen representative bolt calculated by the analytical formulation for weight reduction was verified experimentally. Bolts with varying socket depths were manufactured through cold forging method and bolt tension tests were carried out on quasi-static tension test machine. Results showed that experimental predictions were in good agreement with the results taken from developed analytical model. The critical depth of the socket calculated using the analytical formulation was 3.2% more secure compared to the experimental results. As a result, the validity of the analytical formulation to calculate the critical socket depths of bolts with smaller shaft diameter than socket diameter was confirmed by experimental studies. © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23 Keywords: Failure criterion; Structural integrity; Mechanical testing; Experimental validation; Metal forming 1. Introduction Fasteners are used in many sectors such as automotive, aerospace and defence industry to assemble two or more technical parts. The mechanical behaviour of fasteners or bolts should be examined in detail due to their usage areas. Bolts are produced in different sizes, shapes and grades that define their mechanical properties. Under assembly conditions, the factors to be taken into account when evaluating the strength of a threaded fastener were depicted in Bickford (1998) and various load types observed on threaded fasteners such as tensile, shear, torsional and combined were examined in detail. 2 This is an ope 23 European Conference on Fracture - ECF23 Experimental validation of the formulation for maximum socket depth estimation of non-reduced strength bolts Fatih Kocatürk a,* , M. Burak Toparli a , Barış Tanrıkulu b , Umut İnce a , Cenk Kılıçaslan a a Norm Cıvata San. ve Tic. A.Ş., R&D Center, AOSB, Çiğli, İ zmir, 35620, Turkey b Graduate School of Natural and Applied Sciences, Dokuz Eylül University, Buca, İzmir, 35390, Turkey K a,* Bur a ış b a a

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23

2452-3216 © 2022 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 scientific committee of the 23 European Conference on Fracture – ECF23 10.1016/j.prostr.2022.12.154