Numerical modelling of jointed rocks with large contact zone

Abstract Treadwear is explained by specific mechanical properties and actions of tires. Rubber shear stresses in the contact zone between the tire and the road become large at large slip angles. When normal stresses are insufficient to prevent sliding at the rear of the footprint, wear occurs at a rate that depends on test severity. Two experimental approaches are described to relate treadwear to tire characteristics. The first uses transducers imbedded in a simulated road surface to obtain direct measurements of contact stresses on the loaded, freely-rolling, steered tires. The second approach is developed with the aid of a simple carcass, tread-band, tread-rubber tire model. Various tire structural configurations; characterized by carcass spring rate, edgewise flexural band stiffness, and tread rubber shear stiffness; are simulated and lateral shear stress response in the contact zone is determined. Tires featuring high band stiffness and low carcass stiffness generate lower lateral shear stress levels. Furthermore, coupling of tread-rubber stiffness and band flexural rigidity are important in determining level of shear stresses. Laboratory measurements with the described apparatus produced values of tread-band bending and carcass lateral stiffness for several tire constructions. Good correlation is shown between treadwear and a broad range of tire stiffness and test course severities.

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Numerical modelling of heat and mass transfer in laser surface alloying: Non-equilibrium solidification effects

International Congress on Applications of Lasers & Electro-Optics ◽

10.2351/1.5059774 ◽

2001 ◽

Author(s):

Suman Chakraborty ◽

Sankar Chowdhury

Keyword(s):

Mass Transfer ◽

Numerical Modelling ◽

Heat And Mass Transfer ◽

Laser Surface ◽

Surface Alloying ◽

Laser Surface Alloying ◽

Equilibrium Solidification ◽

Non Equilibrium

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Stibnite vein from Dębowina near Bardo (polish Sudetes)

Contemporary Trends in Geoscience ◽

10.2478/ctg-2014-0004 ◽

2013 ◽

Vol 2 (1) ◽

pp. 28-33

Author(s):

Piotr Kotula

Keyword(s):

Contact Zone

Abstract In the contact zone of the Bardo Structure and Kłodzko-Złoty Stok Intrusion and Kłodzko Metamorphic, metasomatic orebearing quartz-carbonate veins rich in Sb, Zn, Cu, Ag, Au, Pb are present. In 1771 the mine ,,Reiche Silber Gluck” within stibnite vein was founded in Dębowina near Bardo. Its entrance was discovered again in 2007. The stibnite vein is mainly build of stibnite and sphalerite and of quartz and dolomite rich in Mn. Stibnite crystallizes as columnar or forming radiate centres and aciculars. Its crystals reach size to 2 mm. Sphalerite appears as individual anhedral and polymineralic grained concentrations reaching size to 2,5 mm. Earlier pyrite and arsenopyrite crystallized - they occur locally in this deposit. There were found also in the deposit tetrahedrite rich in Ag, what wasn't reported earlier in studies from the mine in Dębowina.

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