The invited lecture first reviewed some basic properties of aluminum foams and discuss their advantages and shortcomings. Then, their application possibilities were be briefly discussed. Next part of the lecture was dedicated to discuss the results of conducted experimental testing of aluminum foam samples with particular attention to their behaviour under impact loading. The lecture then focused on our methodology for proper 3D geometrical modelling of irregular aluminum foam structure and consequent formation of lattice finite element model, used in computational simulations. The lecture finished with discussion about behaviour of aluminium foam under shock wave loading.
B.04 Guest lecture
COBISS.SI-ID: 15989270It is known that the optimal implant inclination corresponds with inclination of the natural tooth root, which was replaced by dental implant. Lack of bone availability (bone atrophy) especially in the posterior segments of the upper and lower jaw, along with the presence of anatomical landmarks such as the maxillary sinus, nasal cavity and the mandibular nerve, sometimes necessitate inclined insertion of implants. Implant inclination leads to multiaxial loading of dental implant, which causes marginal bone resorption and in time results in implant loosening. In the context of this doctoral thesis detailed computational models of all components of the replacement tooth, supported by dental implant, which can be inserted under different angles into the jaw bone in the place of the lower left first molar, were developed. The purpose was to determine the mechanical response of the bone tissue. The initial geometry of dental implant and abutment models, which were used in the simulations, was based on real implants with commercial name Ankylos Plus, manufactured by Dentsply. Bone tissue anisotropy was also taken into account in the simulations. The bone tissue was modelled as a linear elastic constitutive model with density-dependent elastic properties. The bone density was defined in Hounsfield units. The results of the parametric computational simulations show that the method of the bone tissue modelling with elastic, density-dependent orthotropic constitutive model is the most appropriate. The bone tissue state is taken into account through bone density directly in this constitutive model. Furthermore, it seems that the strength of the dental implant, which was used in computational simulations, is insufficient at higher occlusal forces, since the yield stress of dental implant was exceeded in these cases. The most important finding in using this dental implant is that there exists a serious risk of permanent bone tissue damage under the influence of all three occlusal force values, which were modelled in this doctoral thesis. Based on the computational simulations it can be concluded that the existing dental implant geometry is not suitable for higher occlusion forces. In such cases it is recommended to use larger dental implant, or dental implant with different geometry.
D.09 Tutoring for postgraduate students
COBISS.SI-ID: 262554624Cellular structures have an attractive combination of physical and mechanical properties for use in engineering. Their micro- and macroscopic properties make them perfect for use in automotive, rail, naval, aerospace and armor industry as heat exchangers, filters, bearings, acoustic dampers, bio-medical implants, blast protectors and especially as elements for crash energy absorption. The behavior of cellular materials under impact loading conditions and especially the shock wave propagation are still not well understood and are subject of several ongoing investigations. The shock wave propagation through the cellular material structure under impact loading conditions has a significant effect on its deformation mechanism and is therefore imperative to understand its effects thoroughly. The purpose of this cooperation project was to combine the expertise from both partner institutions to augment the ongoing research activities towards common goal, i.e. to better understand the shock wave propagation in cellular materials. The project was intended to investigate and examine the effect of cellular material and structural properties, with or without pore filler, on its behavior under impact loading conditions with particular interest in shock wave propagation and its effects on cellular material deformation. The Shock Wave and Condensed Matter Research Center at the Kumamoto University was handling all experimental testing of analyzed cellular materials, while the Laboratory for Advanced Computational Engineering at the University of Maribor was developing computational models of wave generation and propagation mechanism in cellular materials, based on conducted experimental testing results, which was tested through parametric computational simulations. The computational models and simulation results were then validated by The Shock Wave and Condensed Matter Research Center at the Kumamoto University. The end results of this research endeavor was the development of shock wave generation and propagation control technology for cellular materials, when subjected to impact loading.
D.06 Final report on a foreign/international project
COBISS.SI-ID: 16026646Product development process is a complex process and also decision-making process, which is not related only to product design but to all phases of product's life cycle. Material selection within design process is of great importance as preliminary material selection in early stages of design influences activities to follow and define the impact that product has on the environment through its life cycle. Young and inexperienced designers as well as small and medium sized enterprises are often in arduous position as they face dilemmas in decision-making due to lack of experience consequentially resulting as a bad design or a need for hiring an expert. Product's environmental impact is defined with various ecological parameters, which could be controlled in material selection process. Recyclability is one of problematic ecological parameters for polymer materials as their recycle fracture in current supply is quite low in comparison to other materials. Negative human influence on the environment and exploitation of non-renewable resources are pointing out the importance of sustainable development. Intelligent decision support system model for polymer material selection considering environmental impact developed and presented in this doctoral thesis is an original contribution to scientific society. Moreover, system model is computer support for designing environment-friendly polymer products in engineering practice.
D.09 Tutoring for postgraduate students
COBISS.SI-ID: 262505728The 1th International Scientific Conference on Philosophy of Mind and Cognitive Modelling in Education had been take place at the University of Maribor in Maribor, Slovenia. The conference series had the support of the experts in the field of Philosophy of Mind, Cognitive Science, Psychology, Neuroscience Artificial Intelligence and Education and had become established as a leading international forum for presentation latest research. The aim of the conference had been to promote further international co-operation among Scientists from different disciplines involved in the study of Philosophy of Mind and Cognitive Modelling in Education. The overall objective is to produce an integrated approach to problems of connection Education with the contemporary knowledge from the area of Philosophy of Mind, Cognitive Science, Psychology, Neuroscience, Cognitive modelling and Artificial Intelligence and engineering.
B.01 Organiser of a scientific meeting
COBISS.SI-ID: 19425032