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• The Influence of the Boundary Conditions on the Buckling of Thin-walled Cans during Manufacturing

  41-50

  Dávid Gönczi

  Views:

  94

  In this paper the effect of the boundary conditions on the stability of thin-walled aerosol cans under axial pressure is investigated. The main objective is to outline the main characteristics of this highly nonlinear mechanical problem and to present methods to simulate the buckling of cans with different boundary conditions. Due to the numerical difficulties coming from the contact between the can and different components of the machines, the effect of the different supports of the can is investigated on the crushing (or buckling) force at which the loss of stability occurs. The commercial finite element software Abaqus is used to solve the problems and to present the efficiency of FE codes in the design process of cans.

• Debrecen légszennyezettségének vizsgálata epifiton zuzmók nehézfémtartalmának tanulmányozásával

  48-52

  Zsófia Szabó

  Andrea Keczánné Üveges

  Views:

  137

  Kutatómunkánk során Debrecen város forgalmasabb csomópontjaiban vizsgáltuk a levegőminőséget nehézfém tartalom szempontjából. Vizsgálatainkhoz epifiton indikátornövényeket gyűjtöttünk Debrecen meghatározott útszakaszai mentén, és városon kívüli kontrollterületen. A mintavétel a zuzmók vegetációs időszakának megfelelően március elején történt. A begyűjtött minták tisztítását, szárítását és roncsolását követően vizsgáltuk azok toxikus fémtartalmát Induktív Csatolású Plazma- Optikai Emissziós Spektrometria elven működő készülékkel. Összesen 9 fém koncentrációját vizsgáltuk, többek között a nickel, ólom, réz és cink tartalmat.

• Efficient removal of salts from the residual dross of aluminium melting

  259-269

  István Illés

  Hanna Zakiyya

  Tamás Kékesi

  Views:

  147

  A residual dross of high quantity and high salt content arises from the hot (thermo-mechanical) treatment of the primary dross generated by the production of aluminium alloys from scrap. It contains a relatively low concentration of metal (5 – 10 %) but a high amount (30 - %) of chloride salts and some other components beside the oxide matrix. Due to the components dissolved in or reacted with water, this industrial residue - arising in thousands of tons also in Hungary – qualifies as hazardous and causes a real burden to the environment. According to the laboratory experiments aimed at an economical technology, the chlorides are dissolved within a few minutes when a liquid/solid ratio of 1:1 cm3/g (water volume:sample mass) is assured with an intensity of the horizontal shaking to prevent sedimentation. However, the filling ratio of the vessel also appears to have an effect. An implementation of relatively low cost would allow the recycling of the salt and the application of the final residue for alternative purposes.

• Applicability of Optimization Methods in the Design of Automotive Rubber Products

  358-363

  Dávid Huri

  Views:

  154

  Size, shape or topology optimization are widely used to fulfil the requirements in the design process of rubber products. In many cases, the shape of the product is very complex and comes into contact with other components during operation. It is commonly subjected to large deformation for which the rubber shows strongly nonlinear behaviour. For this complex problem analytical solution is not available, thus finite element method could be used in which the analysis running is a time consuming process. The object of my research is to compare the efficiency and computational cost of different optimization algorithms. This article focuses on the applicability of various optimization methods in the field of automotive rubber goods. Direct search optimization and surrogate model optimization methods will be introduced.