Akyürek, Turgut
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Dr. Öğr. Üyesi
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Makine Mühendisliği
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Former Staff
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Scholarly Output
6
Articles
12
Citation Count
3
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0
6 results
Scholarly Output Search Results
Now showing 1 - 6 of 6
Article Citation - WoS: 2Citation - Scopus: 2Analysis and simplified modelling of simulation of tests for medium-duty truck collision with twin anti-ram bollards(Taylor & Francis Ltd, 2020) Akyurek, Turgut; Akyürek, Turgut; 48511; Makine MühendisliğiAn actual test of medium-duty truck collision with twin anti-ram bollards of steel tube is analysed and simulated with different mass-spring-damper models to study bollard design requirements. Test data is obtained from test report of a medium-duty truck crashed into two fixed twin bollards at speed 78.3 km/h. Maximum impact load and impact height at that time is important in the analysis. Bollard height should be close to or larger than the vehicle's centre of gravity height to avoid climbing of the truck on the bollard. However, increasing impact height yields also increase in failure risk of bollard. Foundation is also critical in success of the bollard in successfully stopping the vehicle. The bollard should be fixed to the frame embedded in the concrete foundation so that the deformation in concrete be minimised. The bollard should be so stiff to stop the vehicle while most of the impact energy is absorbed by the vehicle through deformation of its frontal sections. A single-degree freedom linear mass-spring-damper model is the simplest model, but its results are not in line with test data. Single-degree non-linear model simulates the peak load but not the load history. However, using engine mass instead of truck mass in the single-degree model provides acceptable impact force data for the bollard. Two-degree freedom mass-spring damper linear model seems to simulate both truck's and bollard's deformation in a good manner. Non-linear analysis simulates the collision in a more realistic way, but it requires more data to be determined with testing.Article Citation - WoS: 1Citation - Scopus: 1Analyses of plate perforation for various penetrator-target plate combinations(Korean Soc Mechanical Engineers, 2022) Akyurek, Turgut; Akyürek, Turgut; Makine MühendisliğiIn this study, kinetics and kinematics of perforation process for various penetrator-target plate combinations is analyzed, a methodology in a flow chart format to decide on failure mode, and for each failure mode, an appropriate combined analytical model that requires only common test data is proposed. The proposed methodology and analytical models that are recommended for the related failure mode are assessed by using a huge amount of test data from the literature. The penetrator-target plate configurations cover the penetrators with ogive, conical, hemi-spherical and blunt noses, at different plate thicknesses, and plate thickness to penetrator diameter ratios, made of different metallic materials. Analyzed failure modes include ductile hole enlargement, plugging, dishing, and petal forming. Assessment is done for impact velocities ranging between 215-863 m/s. The estimations based on the proposed flow chart and recommended failure models are in good agreement with the related test data and numerical analysis results.Article Citation - WoS: 0Citation - Scopus: 0Kinematic Analyses of Metallic Plate Perforation by Penetrators with Various Nose Geometries(defence Scientific information Documentation Centre, 2022) Akyurek, T.; Akyürek, Turgut; Makine MühendisliğiThis study analyses kinematics of a metallic plate perforation by a penetrator with truncated ogive nose geometry to find solutions also to blunt, conical, ogive, and hemi-spherical nosed penetrators. Plugging, ductile hole enlargement, dishing, and petal forming failure modes are used in the analyses. Acceleration throughout perforation is calculated by using the related failure mode, analytical model, and the target-penetrator interaction geometry. Depending on the failure model; back lip and front lip formation during ductile hole enlargement, plug formation during plugging, and deflection of target plate during dishing is also analysed. Analyses are based on projectile???s equation of motion, momentum and energy equations, and projectile-target plate interactions. The analyses results for selected cases, with the impact velocity range 215-863 m/s, are compared with the test data. The residual velocity estimation for a strike velocity is close to the related test data with an error of 0.3-2.2 %, except for conical nosed penetrators at impact velocities approaching the ballistic limit velocity.Article Assessment of the Use of AutoCAD in Mechanical Engineering Technical Drawing Education(2017) Akyürek, Turgut; Makine MühendisliğiAutoCAD is one of the widely used software tools in engineering education. In this study, a general assessment of AutoCAD for the usage in the mechanical engineering technical drawing education is made. AutoCAD is assessed in terms of the fulfilment of the requirements defined for the main two technical drawing courses. AutoCAD is assessed in terms of its capability in meeting the requirements of the technical drawing courses.Article Assessment of the Use of AutoCAD in Mechanical Engineering Technical Drawing Education(2017) Akyürek, Turgut; Makine Mühendisliği: AutoCAD is one of the widely used software tools in engineering education. In this study, a general assessment of AutoCAD for the usage in the mechanical engineering technical drawing education is made. AutoCAD is assessed in terms of the fulfilment of the requirements defined for the main two technical drawing courses. AutoCAD is assessed in terms of its capability in meeting the requirements of the technical drawing coursesArticle Hasar toleransında parametrik analiz-devir sayma tekniğinin etkisi(Çankaya Üniversitesi, 2013) Akyürek, Turgut; 48511; Makine MühendisliğiBu makalede hasar toleransında etken olan önemli parametrelerin hasar tolerans ömürleri üzerine etkileri çalışması kapsamında yük devirlerini sayma yönteminin yorulma çatlağı büyümesi tahminlerine etkileri analiz edilerek, sistemlerin hasar toleransına dayalı tasarımlarında en uygun, çözümü ararken göz önünde bulundurulması gerekli devir sayma teknikleri irdelenmektedir.
