Wyniki wyszukiwania - BazTech

1

Mechanical and Thermal Stresses in an HPDC Machine Plunger During the Dosing and Filling Process

Jankowski Jacek, Kołakowski Dariusz, Pisarek Bogusław Piotr

Advances in Science and Technology. Research Journal

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2020

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Vol. 14, no 2

1--12

EN

Distributions of mechanical and thermal stresses in a plunger of the high pressure die casting machine with a horizontal shot sleeve have been considered for a flat thermal stationary problem. An axial pressure of the plunger pressing in the technological process has been accounted for as well. Principal and equivalent stresses have been determined within two different hypotheses on the strength of materials, including one theory covering various allowable stresses in tension and compression. Four plunger material variants have been analysed.

2

Analysis of Mechanical and Thermal Stresses in a Pressure Casting Machine Plunger

Jankowski Jacek, Kołakowski Dariusz, Pisarek Bogusław Piotr

Advances in Science and Technology. Research Journal

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2020

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Vol. 14, no 1

209--223

EN

The study discusses the thermo‑mechanical stress distribution in the plunger of a cold chamber casting machine with a horizontal casting chamber in the stationary aspect. The main stresses as well as the reduced stresses were determined for four different strength hypotheses, two of which took into account different acceptable maximal tensile and compressive stresses. For comparative purposes, the calculations were performed for three different construction materials used for cold chamber pressure machine plungers: grey pearlitic cast iron, high silicon bronze and beryllium bronze, as well as one more type of bronze, which has not been used for plungers so far, i.e. aluminium‑iron‑nickel bronze, constituting the initial alloy for the newly‑developed complex bronzes with high wear resistance and elevated strength.

3

Influence of Production Process and Material Factors an Fatigue Strength af Tubular Stabilizer Bar

Wittek A. M., Burdzik R., Folęga P., Konieczny Ł., Łazarz B.

Archives of Metallurgy and Materials

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2015

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Vol. 60, iss. 4

2485--2492

EN

The paper presented results of the research on process of production of highly important element of passenger car. The main object of the research was influence of production process and material factors on fatigue strength of tubular stabilizer bar. The scope of the research included the stabilizer bar hot bent at the bending table, hardened in oil and tempered. The bending radii I, II and III were metalographically tested. The stabilizer bar was also subjected to fatigue tests. For analysis purpose the finite element method (FEM) calculation have been conducted. The analysis of relationship of outer diameter to wall thickness is very important. The analysed bar has broken early. The paper presents the reasons for premature failure of the tubular stabilizer bar.

PL

W artykule przedstawiono wyniki badań procesu produkcji bardzo ważnego elementu zawieszenia pojazdu samochodowego. Głównym celem badań była analiza wpływu czynników procesu produkcyjnego i paramtetrów materiałowych na wytrzymałość zmęczeniową stabilizatora rurowego. Zakres badań obejmował gięty na gorąco stabilizator rurowy, hartowany w oleju i odpuszczany. Promienie gięcia I, II i III zostały poddane testom metalograficznym. Stabilizator poddano również testom zmęczeniowych. Dla celów analizy przeprowadzono obliczenia zmęczeniowe z wykorzystaniem MES. Niezwykle ważna jest analiza stosunku średnicy zewnętrznej do grubości ścianki. Badany stabilizator uległ przedwczesnemu zniszczeniu. W artykule przedstawiono przyczyny przedwczesnego uszkodzenia badanego stabilizatora rurowego.

4

Numerical simulation of the elastic-plastic state of rock mass around horizontal workings

Shashenko A., Gapieiev S., Solodyankin A.

Archives of Mining Sciences

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2009

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Vol. 54, no 2

341-348

EN

In the article one approach to the determine of geomechanic tasks, which take into account the rock deformation breed over the strength limit, is described. Approach is adapted to getting task's result with the help of numerical method. Verification showed that results which are got at application of this approach are adequate an analytical decision and a results of "in-situ".

PL

Praca opisuje podejście stosowane przy określaniu zadań geomechaniki z uwzględnieniem deformacji skał powyżej granicy wytrzymałości. Podejście to stosuje się dla określenia problemu w oparciu o metody numeryczne. Weryfikacja wykazała, że uzyskane wyniki odpowiadają wynikom otrzymanym w oparciu o metody analityczne oraz o badania in situ.