Dr. Zoltán Nyikes
Department of Informatics, Milton Friedman University, Kelta u.2., 1039 Budapest, Hungary
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Academic Career Length
12Years (2015-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
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Journal Article
MSMariam Shbanah
Mariam ShbanahMJMárton Jordanov
Márton JordanovZoltán Nyikes
László TÓTH
Tünde Anna KovácsThree-dimensional printing is a useful and common process in additive manufacturing nowadays. The advantage of additive polymer technology is its rapidity and design freedom. Polymer materials’ mechanical properties depend on the process parameters and the chemical composition of the polymer used. Mechanical properties are very important in product applicability. The mechanical properties of polymers can be enhanced by heat treatment. Additive-manufactured PLA’s mechanical properties and structure can be modified via heat treatment after the 3D printing process. The goal of this research was to test the effect of heat treatment on the mechanical and structural parameters of additive-manufactured PLA. This was achieved via the FDM processing of standard PLA tensile test specimens with longitudinal and vertical printing orientations. After printing, the test specimens were heat-treated at 55 °C, 65 °C and 80 °C for 5 h and after being held at 20 °C for 15 h. The printed and heat-treated specimens were tested using tensile tests and microscopy. Based on the test results, we can conclude that the optimal heat treatment process temperature was 65 °C for 5 h. Under the heat treatment, the test specimens did not show any deformation, the tensile strength increased by 35% and the porosity of the PLA structure decreased.
1 June 2018 in Journal of Physics: Conference Series
Conference Paper
The railway is a very important segment of the public transport and therefore its part of the critical infrastructure system. The speed of the trains depends on the rail conditions. The state of the rails needs continuous control to determine the train speed and continuous traffic and transport. The goal of the Industry 4.0 is to build a smart industry and industrial environment [1]. Part of this smart system is the traffic and the transportation on road and railway too. The continuous railway transportation needs quality railroads and trains. The rails have complex load during their lifetime. In this research, we wanted to find a test method and innovate an experimental setup for the continuous state control of rails. In our work, we wanted to find a relationship between propagations of the rail surface damage and the loads. Also based on failure propagation rules we wanted innovate a special installation for in situ monitoring the process of the rail surface damage, predict the defects and crack propagations. This work is in accordance with the aim of the Industry 4.0.
Journal Article
Enikő BitayLászló TÓTH
Tünde Anna KovácsZoltán Nyikes
Attila Levente GergelyIt is desirable to improve tool steel wear resistance to produce pieces with precise dimensions and increase the lifetime of tools. The aim of this work was to modify the surface of 1.2344 (X40CrMoV5-1) hot work tool steel to improve the wear properties. Surface modification was achieved in three steps: first, hardening was applied, followed by plasma nitridation and, finally, physical vapor deposition (PVD) was employed to produce a TiN/AlTiN multilayer coating. The microhardness and the wear coefficient of the surfaces were measured. PVD coating showed the highest hardness value, 2938 HV0.01, whereas plasma nitridation followed by PVD resulted in 2679 HV0.01. The surface modification resulted in an increase in surface roughness in all cases compared to the hardened sample. However, the wear coefficient showed a significant decrease for the surface treated samples. The lowest wear coefficient of K = 1.47 × 10−10 mm3/Nm, which is a magnitude lower than the reference hardened sample (K = 6.32 × 10−9 mm3/Nm), was achieved employing both plasma nitridation and PVD. The results confirm that the use of a combined surface modification of plasma nitridation and PVD significantly improve the wear resistance of the treated samples.
1 October 2019 in IOP Conference Series: Materials Science and Engineering
Conference Paper
Tünde Anna KovácsUMUmesh Mhatre
Umesh Mhatre
Zoltán NyikesEnikő BitayThe surface modification is a suitable technology to increase the surface wear resistance of steels. In this way, the used substrate metal can be a low alloyed, cost-effective chemical composition steel. After the substrate metal heat treating, hardening and annealing, it needs surface modification. It well knew some surface heat treating technologies, like carburizing, nitridation, nitrocarburizing, and surface quenching. The surface coating is also very useful technologies when by the chemical or physical process it built a new layer on the surface. In this work, we compare different modification processes results made by the way of the traditional and new technologies advantages. The chemical composition and the structure determine the surface mechanically and wear resistance properties. The available chemical composition determines the surface modification technology [1-3]. It was prepared with different surface layers on the same substrate steel by a different process and inspected by different testing methods. On the base of the tests results needs to specification a new surface modification process for the high-level surface resistance layer.
14 September 2017 in Key Engineering Materials
Journal Article
DBDávid Ágoston Balázs
Dávid Ágoston Balázs
Zoltán NyikesTünde Anna KovácsBuilding protection on our century is very important because of the terrorist attacks. The old buildings in Europe aren’t enough strong again blast loads. Nowadays we know many different explosives and theirs effects of walls and human bodies. The detonation caused blast effect provokes building damage and fragmentation effects. The explosion caused damages, parts of bricks and fragments produce other secondary damage in other buildings and human bodies.It can’t protect the historical and old buildings by new walls and fences because of the cityscape. It needs to find new possibilities to improve the buildings resistance again blast effects. It needs a effectively thin and strong materials to reinforced the buildings walls. The new materials innovated by material science can be good solution for this project. These materials usually composites likes syntactic foams, spherical shells or carbon fields reinforced composites.
About Me
Dr. Zoltán Nyikes is an
Associate Professor and researcher specialising in cybersecurity, critical
infrastructure protection, industrial digitalisation, and advanced engineering
technologies. His work focuses on industrial control systems, operational technology
environments, Industry 4.0 infrastructures, cyber-physical systems, industrial
robotics, cloud computing, and information security. He has extensive
experience in vulnerability assessment, security auditing, cyber risk analysis,
and the application of international cybersecurity standards, including IEC
62443, NIST SP 800-82, the NIST Cybersecurity Framework, and NIS2-related
requirements. His current interests include the use of artificial intelligence
and machine learning in cybersecurity, industrial process optimisation, and
decision-support systems. His scientific activities also include advanced
manufacturing technologies, such as explosive welding, explosive cladding,
additive manufacturing, wire arc additive manufacturing, and AI-assisted manufacturing
optimisation. He contributes to international scientific cooperation as a
reviewer, editor, and scientific committee member for conferences and
peer-reviewed journals indexed in Scopus and Web of Science. His
interdisciplinary research connects information technology, engineering
sciences, manufacturing technologies, and critical infrastructure resilience,
with emphasis on practical industrial applications and emerging technological
challenges.