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Laboratory for composite materials and engineering software

This Laboratory contains two units (divisions): Division for dynamic testing and Division for engineering software.

Division for dynamic testing is under development.

The Hopkinson bar is the main experimental plant at the Laboratory and it is used for testing of metal and composite test-tubes under very high (impulse) deformation speeds. Our original construction is based on the results of five projects with Joint Research centre, Ispra, Italy (European Commission for Atomic Energy). Without such database, all software for dynamic analysis of constructions is practically useless, because the error of wrong material constants is huge. In order to complete the base with low and medium deformation speeds, different temperatures and damages, we have the results of the projects for crosscut and "bichierino" ("knee cup") test-tubes. This is the only such construction on the area of the former SFRJ.


Main research fields are: visco-plasticity of metals and composites, stability of non-linear vehicle vibrations, multi-axial dynamic experiments, geometrical theory of dislocations, waves in elastic composites and plastic waves, plasticity of damaged and neutron radiant steels, visco-plasticity of ferromagnetics, low-cycle fatigue of austenite steel, non-elasticity of micromorphous polycristals.

The Laboratory has original constructions done by students within their final exams.  One of them is based on step motor and simulates programmed motion given by arbitrary time function.

Division for engineering software

Main activities of the Division for engineering software are connected to development of Program for analysis of constructions (PAK) and it application in research and solving of practical problems. PAK is a program of general application for linear and nonlinear static and dynamic analysis, heat conduction, fluid mechanics with heat transfer, coupled problems, biomechanics, fracture mechanics, damage mechanics and material fatigue. PAK program has a level of globally known programs for structural analysis. It is based on top-level theoretical achievements in the field of finite elements method. The authors of the program had published their original scientific results and methodologies from the fields of elastic-plastic analysis, thermo-plasticity, anisotropic behavior of materials, new and improved finite elements, coupled problems, biomechanics, fracture mechanics and other, in a great number of globally known journals nad books. Program is fully documented and has all necessary manuals. The Laboratory constantly supports the training of new users and software maintenance. PAK program is used in education within a large number of subjects at after graduate and final years of studies. Also, the program is used in development of many doctoral dissertations, master's theses and final works at our Faculty and at other faculties in the country.  

At the Laboratory for engineering software, there is a constant realization of several projects of the Ministry of science of the Republic of Serbia, and of projects realized in direct cooperation with the economy, in the country and abroad. The most significant users of our program and services are: Institute for water power engineering "Jaroslav Cerni" from Belgrade, Institute for automobiles "Zastava" from Kragujevac, Electrical industry of Serbia, "MV Engineering" - Krefeld - Germany, Freight car factory from Kraljevo, Military technical institute from Belgrade and many others.

 Image Several filter and stress-deformation analyses of interaction between cumulative reservoir, dam and rock mass were don for needs of Institute "Jaroslav Cerni". Stress-deformation analyses were done with application of elastic-plastic model of material behavior and with concept of critical state. A methodology is developed that gives very good estimation of global structure security, as well as a possibility of localization of critical zones regarding static and filter stability.

The great number of experiments conducted at the Institute for automobiles were modeled with application of developed software. By comparison of broken carrier with deformed configuration of the model at the end of the deformation process, a good agreement between results was confirmed. By application of PAK software, need for waste experimental research is reduced and that contributes to considerable savings.

 Image Great number of thermo-plastic analyses of drums in our thermal plants and estimation of remaining operating life time are done for needs of Electric industry of Serbia. It has been shown that it is necessary to model in detail the zones of high stress concentration, because, with adequate modeling, a considerable less maximal effective plastic deformation is gained, and the larger remaining operation life time of the construction is gained based on low-cycle fatigue.
 Image Thanks to "Milanovic engineering" company, and for the needs of "LINDE" company from Germany, the analyses of several plants for water refinement - a send filter, sediment filter and multimedia filter, were conducted. These plants are used for water supply in Algeria. The influence of the existing crack on operation abilities of lifting beams used in steel factories of "MANNESMAN" company from Germany was analyzed and calculation of heat conduction through insulation material "VATRAMIL" was conducted.
 Image Static and dynamic analysis of freight car tank and revolving pedestal were conducted for the needs of Freight car factory from Kraljevo. Achieved results are compared with experimental results and a good agreement was obtained. The influence of the observed cracks on revolving pedestal on it carrying capacity was analyzed. Several different ways for rehabilitation and reconstruction of critical spots were modeled and, based on gained results, the optimal solution is selected.
 Image Thanks to the development of the module for biomechanics, for modeling of muscle and connective tissues, blood flow through blood vessels and other medical phenomena, the cooperation on international projects is established with: Harvard School of Public Health from USA, Nanyang Technology University from Singapore and Hong Kong Polytechnic University from Hong Kong.