Geometry of Quantum Principal Bundles I

A theory of principal bundles possessing quantum structure groups and classical base manifolds is presented. Structural analysis of such quantum principal bundles is performed. A differential calculus is constructed, combining differential forms on the base manifold with an appropriate differential calculus on the structure quantum group. Relations between the calculus on the group and the calculus on the bundle are investigated. A concept of (pseudo)tensoriality is formulated. The formalism of connections is developed. In particular, operators of horizontal projection, covariant derivative and curvature are constructed and analyzed. Generalizations of the first structure equation and of the Bianchi identity are found. Illustrative examples are presented.Comment: 64 pages, AMS-LaTeX, To appear in CM

Friction stir welding of aluminium alloys - T joints

The paper presents results of research on the possibility of producing T-joints of aluminium alloys without defect by friction stir welding process. Friction stir welding process is applied in welding T-joints of aluminium alloys 5052-H32 and 5754-H111. These relatively new welding tech-nologies produce high quality welded joints, where strength of the joint can reach the strength of the base material. Visual and macrostructural examination and microhard-ness measuring of the welded T-joints are processed

Friction stir welding of aluminium alloys - T joints

The paper presents results of research on the possibility of producing T-joints of aluminium alloys without defect by friction stir welding process. Friction stir welding process is applied in welding T-joints of aluminium alloys 5052-H32 and 5754-H111. These relatively new welding tech-nologies produce high quality welded joints, where strength of the joint can reach the strength of the base material. Visual and macrostructural examination and microhard-ness measuring of the welded T-joints are processed

Numerical-experimental determination of stress and deformation state in connection lugs

The present paper describes the numerical and experimental methodology for the analysis of stress and deformation state in structural elements with geometrical discontinuities. Research is based on structural elements of the connection lug type and stress and deformation state. Numerical analysis is conducted by applying the finite ware package. Experiments are performed at the Laboratory for Stress and Deformation Measurements, Faculty of Mechanical Engineering, Belgrade, using GOM equipment the framework of the paper

Numerical-experimental determination of stress and deformation state in connection lugs

The present paper describes the numerical and experimental methodology for the analysis of stress and deformation state in structural elements with geometrical discontinuities. Research is based on structural elements of the connection lug type and stress and deformation state. Numerical analysis is conducted by applying the finite ware package. Experiments are performed at the Laboratory for Stress and Deformation Measurements, Faculty of Mechanical Engineering, Belgrade, using GOM equipment the framework of the paper

Numerical analysis of stress and strain state of structural elements of container terminal

The results of the research regarding the stress and strain state in structural elements of the container terminal are presented in this paper. The container terminal is used for the electrical energy supply and control system of conveyor belts in the exploitation of mining basin 'Kolubara'. Stress analysis of the structural elements has been done with loading containers where one container with electrical equipment weighs 28 tons. The container terminal is in the process of production

Development and calculation of supporting structure for mining power equipment

Development and calculation of the base supporting struc-ture used for mining equipment is the aim of the paper. The base structure is intended for the installation of electronic communication and power equipment and devices that supply and manage mining equipment. The first part of the paper covers the existing solutions, and the second part shows the development of a new solution. Design solution of a new base structure is presented, a calculation of the base according to valid standards and regulations, and the numerical determination of equivalent stress and strain by Abaqus (R) software. Finally, the performed solution is given

Development and calculation of supporting structure for mining power equipment

Development and calculation of the base supporting struc-ture used for mining equipment is the aim of the paper. The base structure is intended for the installation of electronic communication and power equipment and devices that supply and manage mining equipment. The first part of the paper covers the existing solutions, and the second part shows the development of a new solution. Design solution of a new base structure is presented, a calculation of the base according to valid standards and regulations, and the numerical determination of equivalent stress and strain by Abaqus (R) software. Finally, the performed solution is given

Microhardness and Macrostructures of Friction Stir Welded T-joints

The results of research regarding the friction stir welding process of T-joints are presented in this paper. Experimental welding of two and three aluminium plates were performed in order to obtain T-joints. Microhardness measuring and macrostructural examinations of welded T-joints of aluminium alloy are processed. All phases of the welding process are monitored by visual control

Numerical-Experimental Determination of Stress and Deformation State in Connecting Lugs with the Effect of Contact Area Size

The present paper describes numerical and experimental methodology for the analysis of stress and deformation state in structural elements with geometrical discontinuities. The research is based on structural elements of the connecting lug type. The stress and deformation state was determined as the contact area size between the axle and the connecting lug was changing. Numerical analysis was conducted by applying the finite element method in a ''KOMIPS'' software package. Experiments were performed at the Laboratory for stress and deformation measurements, Faculty of Mechanical Engineering, University of Belgrade, using ''GOM'' equipment and ''ARAMIS'' software application (DIC). This paper demonstrates how it is possible to anticipate the results by applying FEM. A short review of current research in the field of structural elements with geometrical discontinuities is given within the framework of the paper