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Obliczanie namiaru wsadu metalowego z wykorzystaniem algorytmu simpleks

100%

Piątkowski J. , Szymszal J. , Binczyk F.

tom R. 2, nr 6

179-188

Uniwersalną metodą rozwiązywania zagadnień optymalizacyjnych z zastosowaniem programowania liniowego jest algorytm simpleks. Jest to nowoczesny sposób badań operacyjnych, polegający na poszukiwaniu kolejnych rozwiązań bazowych programowania liniowego w postaci kanonicznej. W pracy przedstawiono metodę wyznaczania namiaru wsadu metalowego opartą o optymalizację simpleks, pozwalającą na określenie położenia ekstremum funkcji wieIu zmiennych. Obliczenia prowadzono na przykladzie nadeutektycznego siluminu AISi17 z dodatkiem Cu, Ni i Mg.

Simplex algorithm is universal method of dissolving of questions optimisation with utilization of linear programmes. It is this modern way of operating investigations, depending on search of next base solutions of linear programme in canonical form. In work metal leaning of marking of bearing of batch method was introduced about optimisation simplex, permitting onto qualification of position of extreme variable function. Calculation hypereutectic AISi17 alloy with addition Cu, Ni and Mg alloys was led on example.

Crystallization Behavior and Properties of Hypereutectic Al-Si Alloys with Different Iron Content

67%

Deev V. , Prusov E. , Prikhodko O. , Ri E. , Kutsenko A. , Smetanyuk S.

tom Vol. 20, iss. 4

101--107

Understanding the influence of iron impurity on the formation of the structure and the properties of hypereutectic aluminum-silicon alloys are important for achieving the required quality of castings, especially those obtained from secondary materials. In the present work, the influence of different iron contents (0.3, 1.1, and 2.0 wt.%) on the crystallization process, microstructure and mechanical properties of the Al-15% Si alloy was studied. It is shown that the presence of iron impurity in the Al-15% Si alloy leads to increasing the eutectic crystallization time from 6.2 to 7.6 s at increasing the iron content from 0.3 wt.% to 1.1 wt.%, changing the structure of the alloy eutectic in the solid state. The primary silicon and β-Al5SiFe phase coexist in the structure of the Al-15% Si alloys at a temperature below 575°C in the range of iron concentrations from 0 to 2 wt.% in equilibrium conditions. In the experimental alloys structure, the primary crystals of the β-phase were metallographically detected only in the alloys containing 1.1 and 2 wt.% of iron impurity. Increase of the iron content up to 2 wt.% significantly reduces the mechanical properties of the Al-15% Si alloy due to the formation of large platelet-like inclusions of β-Al5SiFe phase.

Formability modelling of aluminium base PM alloys.

51%

Bagaviev A. , Durisin J. , Dybiec H. , Klein K. , Mandziej S. , Ziaja G.

tom R. XIX, nr 4

1153-1158

The paper presents the results investigations carried out in the frame of the Project CT 96-0750 MicroAlu of Inco-Copernicus program. The investigated materials are PM aluminium alloys with high contents of silicon. The aim of this part is a comprehensive characterisation of microstructure features and specific parameters at the example of an AlSi27Ni6 alloy. The experiments on the plastic and viscoplastic behaviour of this alloy (compressive and tensile tests) at different temperatures and strain rates were done to identify the material properties. The evolution of the microstructure of the tested specimens due to temperature rise and deformation process was investigated with optical and electron microscopy as well as with X-ray analysis technique. The alloy was compacted by a PM extrusion process to a preform and then forged to a final product -connecting rod. From the performed experiments the constitutive parameters were identified and the connecting rod forging process has been simulated by means of a general purpose FEM program.