Aktaş, Latif Tibet
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Aktas, Latif Tibet
Aktaş, Latif Tibet
Aktaş, Latif Tibet
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tibet.aktas@ieu.edu.tr
Main Affiliation
05.10. Mechanical Engineering
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Current Staff
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Documents
2
Citations
1
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1
Documents
0
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0
Scholarly Output
6
Articles
2
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3/6
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0
Supervised PhD Theses
0
WoS Citation Count
1
Scopus Citation Count
1
WoS h-index
1
Scopus h-index
1
Patents
0
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0
WoS Citations per Publication
0.17
Scopus Citations per Publication
0.17
Open Access Source
5
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0
| Journal | Count |
|---|---|
| Mechanics of Composite Materials | 1 |
| Sn Applıed Scıences | 1 |
Current Page: 1 / 1
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6 results
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Now showing 1 - 6 of 6
Conference Object Finite element analysis of material and parameter effects in ballistic armors(İzmir International Student Association - 2nd International Students Science Congress, 2018) Aktaş, Latif Tibet; Çevik, MehmetThe literature about the ballistic armors are mostly focused on 2 or 3 different parameter effects. The aim of this study, differently, is to find and compare the effects of specific materials on protection of composite ballistic armor plates against high-velocity projectile impact. The effects of stacking sequence for different materials, projectile type, target plate shape and impact obliquity are investigated individually. It is shown that the proposed stacking sequence decelerates the residual velocity of the projectile better than the other considered arrangements. The average percentage of kinetic energy absorption of rectangular shaped Kevlar 29/epoxy plate is considerably higher than that of circular shaped Kevlar 29/epoxy plate.Conference Object Optimization study of ballistic impact tests on carbon–carbon composites(İzmir Katip Çelebi Üniversitesi Yayınları - 4th International Students Science Congress, 2020) Aktaş, Latif Tibet; Aydın, LeventIn this study it is intended to optimize a high velocity impact case of a composite plate. The case is selected from the literature based on its dataset properties (e.g. amount of inputs and outputs, number of tests, physical relations with real life situations and relations between the properties studied on). The base study focused on failure response of advanced carbon-carbon composites under high velocity impacts. In the present study, two unique models are introduced within the scope of the present study as dimensionless damage areas of front and back sides of the composite plate. Multiple nonlinear regression method is used for objective functions of the optimization problem. The prediction models found in the present study are in first order trigonometric multiple nonlinear regression form; thus, these models can be considered as the basic prediction functions of high velocity impact response of carboncarbon composites under high temperatures, in processing power terms. Since the determination coefficient values have been found quite similar with the ones in the base study, the presented models in this study can be considered successful to predict the results.Conference Object Diameter and pattern effects of Al₂O₃ balls on ballistic strength of metal–ceramic composites(İzmir Katip Çelebi Üniversitesi Yayınları - 6th International Students Science Congress, 2022) Aktaş, Latif Tibet; Çevik, MehmetIn composite materials made from metals and ceramics, a metallic substrate material is reinforced with ceramic hardened particles. This combination makes it possible to combine the low weightiness of the metal with the resistance of ceramics. Used metals in those types of composites have greater density than the ceramics, so relatively, metals are heavier than ceramics, but in metal-ceramic composite applications, the metal parts are used in small quantities as in thin slices. These types of composites can combine attractive properties of both a ceramic, such as high temperature resistance and hardness, and those of a metal, such as the ability to undergo plastic deformation. Metal-ceramic armors are used in the fields where the weight factor is not crucial yet important for mobilization. Metal-ceramic composites show their unique values in armor technologies especially in vehicle protection applications. Ceramic balls offer advantages such as being lightweight, lower friction resistance, high temperature resistance, higher rigidity, higher hardness, and higher corrosion resistance than metallic composite core, but these properties belong to the material nature. In ballistic applications like high velocity impact situations, spherical shape, theoretically must have an effect on bullet trajectory. Because of the curved surface of a sphere, chances are a projectile hits any spherical surface obliquely. That means the projectile loses some of its kinetic energy by transferring it into the sphere and changing course into another trajectory axis. Shao et al. showed this trajectory deflection effect vividly.Article Ballistic Impact Analysis of Composite Armors Incorporating Prismatic and Spherical Self-Healing Ceramic Structures(Springer, 2025) Aktas, Latif Tibet; Cevik, MehmetAn innovative composite armor design aimed at enhancing bullet deflection and self-healing properties was presented. The armor incorporates triangular prismatic and spherical alumina ceramics with the prismatic ceramics fixed to the inner casing and the spherical ceramics freely positioned in vertical grooves. This arrangement allows the spherical ceramics to shift and fill gaps left by shattered ceramics post-impact, thereby providing limited self-healing capabilities. Ballistic tests and finite element simulations, validated by these tests, demonstrated the armor's effectiveness in deflecting projectiles. The design showed significant deflection, when projectiles impacted either directly on the triangular prismatic structures or on two adjacent spheres followed by the prismatic structures. Direct hits on the prismatic ceramics prevented perforation by the bullet core with only jacket fragments passing through. The ballistic tests also confirmed the armor's self-healing capacity. Damaged ceramics moved to lower gaps, while intact spherical ceramics filled the damaged zones, restoring protection. This gravity-assisted self-healing mechanism, combined with the bullet-deflecting properties, results in a lightweight and efficient armor solution suitable for vehicle applications. The armor design proposed addresses critical challenges of ceramic armor, such as brittleness and fragmentation, by utilizing geometric arrangements and self-healing capabilities to enhance overall protective performance.Article Citation - WoS: 1Citation - Scopus: 1Stochastic Optimization and Modeling of High-Velocity Impact Tests on High-Temperature Carbon-Carbon Composites(Springer Int Publ Ag, 2021) Aktas, Latif Tibet; Aydin, LeventIn this study, it is intended to optimize a high-velocity impact case of a composite plate.The case selected from literature focused on the failure response of advanced carbon-carbon (C/C) composites under high-velocity impacts. Based on the stochastic optimization method, three unique models are introduced within the present study's scope as dimensionless damage areas of front and back sides and the composite impact energy response. The difference between the equations found in the present study and the base study is the number of variables. Obtained prediction models consist of only the tests' input variables; thus, these models can be considered the essential prediction functions of high-velocity impact response of C/C composites under high temperatures. Multiple nonlinear regression method is used for objective functions of the optimization problem. Since the determination coefficient values have been found quite similar to the ones in the literature, the presented models can be considered successful in predicting the results. By utilizing the novel regression functions presented in this study, the damaged areas are minimized. Without the necessity of experimental research, further predictions can be made by operating the models found in the present study.Conference Object Impact location effects on ballistic performance of checkerboard-formation ceramic sphere armor(ITU Press - International Congress on New Trends in Mechanics, 2025) Aktaş, Latif Tibet; Çevik, MehmetThis study explores the influence of localized impact positions on the ballistic performance of modular ceramic armor systems. Utilizing a previously validated finite element model based on experimental data, simulations were conducted on an armor panel composed of alumina ceramic spheres arranged in a checkerboard configuration. The selected sphere diameter and layout had been previously identified as optimal for energy dissipation in high-velocity projectile impacts. In this extended analysis, the effect of varying projectile impact locations across the ceramic surface was evaluated. Rather than assuming central impacts, the study considered more realistic scenarios where projectiles may strike the edges of ceramic elements, vertical and horizontal locations between them, or the interstitial voids that naturally occur in such configurations. The findings indicate that the location of impact significantly alters the armor’s ability to absorb and dissipate kinetic energy. Certain locations were found to enhance resistance, while others allowed more efficient projectile penetration. These results underscore the importance of incorporating spatial variability into the design of advanced ceramic-based protective structures and highlight the need for optimizing geometric configurations not only by material and layout, but also by accounting for the probabilistic nature of real-world ballistic interactions.