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Gas seepage equations of the coal seam under the action of moisture and the stress field

Li B., Li P., Sun D. H., Zhang L. L., Wei C. F., Borisyuk Y. A.

Journal of Power Technologies

2015

Vol. 95, nr 4

250--257

A seepage experiment was conducted in relation to a loaded coal mass with various moisture content and working conditions using self-developed tri-axial gas seepage equipment. A briquette sample was used as the research object. The change in the relationship of coal mass permeability under the combined action of moisture content and effective stress was studied experimentally. The relational function was established between coal mass permeability under this combined action and the seepage equation expressing gas migration in the coal seam. The research showed the following: (1) the moisture content of coal heavily influences effective permeability, as coal mass permeability decreases in a quadratic polynomial relationship with the increase of effective stress at constant moisture content; (2) at constant moisture content in the coal mass, coal mass permeability gradually declines in a negative exponent relationship with the increase of effective stress. Moreover, coal seam gas seepage equations under the combined action of moisture and stress field were put forward based on experimental results, the law of mass conversation and Darcy’slaw.

Determination of Al-Mg-Si alloy deformation resistance curves

Bilik J., Balazova M.

Hutnik, Wiadomości Hutnicze

2014

Vol. 81, nr 8

519--522

The paper is focused on determination of Al-Mg-Si alloy deformation resistance curves at room temperature and at 200, 300, 400 and 500°C with deformation rate 5 s-1. Plastometer Gleeble 3800 was used for obtaining the curves. The curves were determined as addition into Super-Forge 3D simulation software database. The measured deformation resistance curves enable more precise solution of required energy and force for cold or hot forming of Al-Mg-Si alloy.

Niniejsza praca koncentruje się na określeniu oporu kształtowania stopu Al-Mg-Si w temperaturze pokojowej oraz w temperaturach 200, 300, 400 oraz 500°C i prędkości odkształcenia 5 s-1. Plastometr Gleeble 3800 został użyty celem uzyskania krzywych. Krzywe zostały określone jako dodatek do bazy danych oprogramowania komputerowego symulacji SuperForge 3D. Zmierzona odporność krzywej odkształcenia pozwoliła na dokładniejsze rozwiązania służące do wyznaczenia potrzebnej energii i siły aby formować stop Al-Mg-Si na zimno i na gorąco.

Geometry influence analysis on the distribution of effective stress in the contact zones of structures

Kopecki H., Mazurek P.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

2002

z. 58 [193]

135-140

The paper presents the stress distribution analysis in the contact zones of select cases. Using FEM procedures and photo-elastic methods the problem is considered from real stress distribution conformity point of view.