In the alkaline environment of the concrete covering a thin layer of invisible ferric oxide (Fe 2 O 3 ) is created at the steel surface, which protects the steel against corrosion. A drop in the concrete pore fluid pH to the value of 11,8 results in destruction of the passive layer, which in turn increases the rate of corrosion. Ammonium chloride (NH 4 Cl) contained in industrial waste of the artificial nitrogenous fertiliser plant is reacting with all phases of the concrete covering. Changes in the cement grout phase composition and migration of chloride ions inwards concrete deteriorate...
Cutting forces in turning process are analyzed in this paper. Workpiece has a circular cross section with a slot. The measurements are performed using dynamometer made from turning tool with tensometric tapes placed on it. The main cutting force F c , radial force F p and feed force F f are obtained by recalculating of the measured strains on turning tool. The aim of this paper is to determine the effect of slot on the cutting forces in turning process in order to determine optimal processing parameters. Turning of workpiece with a slot rarely occurs in practice, but that case is analogous...
The traditional approach to mechanically characterize materials is to perform destructive tests. When material properties are known, the displacement field of a specimen generally loaded and constrained is univocally defined. This paper suggests an innovative methodology in order to determine mechanical characteristics ( E , ν ) of new materials for an inverse solution of the elastic problem. A hybrid approach based on the combination of phase-shifting electronic speckle pattern interferometry (PS-ESPI) and finite element analysis is utilized. An innovative algorithm, implemented in the...
The acoustic emission (AE) technique has been used for decades to detect damage onset and propagation in different kind of materials. The more complex microstructure of the material, the more information can be derived from the AE signal. Solid mechanics experimentalist are familiar with the acoustic emission produced by the material during the loading phase, which sometimes can be heard simply by naked ears.
In the experimental mechanics the Moiré technique has developed to an established method. At the Chemnitz University moiré methods were investigated since 1965.
Knowledge of real material parameters and its behaviour is nowadays a condition for numerical simulations, widely used in industry to design quality components in very short time. The paper presents the method of Electronic Speckle Pattern Interferometry (ESPI) to get the coefficient of thermal expansion of carbon fibres laminates and behaviour of the high strength steel sheets during the unloading process after large plastic deformations.
With the planned construction of the fixed link across the straits known as the Fehmarn Belt, which will connect the island of Fehmarn in Germany with the Danish island of Lolland, a heavy increase in traffic is predicted on the Fehmarnsund Bridge, built in 1963. For this reason, it became necessary to verify available or new mathematical load bearing calculations against assessments acquired through measurement. This paper describes only the execution of measurements and their evaluation or interpretation; however, it does not determine any results nor does it derive any conclusions with...
Experimental investigations in present paper were divided into: dorsiflexion and fatigue tests. Dorsiflexion test was done for (perlon-carbon fibre-acrylic) materials and ordinary solid designs of orthoses are 8.2° and 7.7° respectively using "Dartfish program". The fatigue test was achieved on prosthetic foot worn sole and measured life of sole found to be 2.137 × 106 cycles. The theoretical AFO lives were equal to 1.0 × 107 and 2.3 × 106 cycles for calf and sole parts respectively; while theoretical dorsiflexion angle of sole is equal to 8.266°.
The technology of platform anchorage systems has been developing quickly nowadays. Due to the oil extraction in deep waters, the traditional mooring types, such as anchor cable/wire rope/anchor cable in catenary shape, were replaced by a “Taut-Leg” geometry. This type, characterized by an anchor cable/synthetic cable/anchor cable, operates in a straight mode, reducing weight and modifying the mooring operation. Therefore, the synthetic ropes for offshore platform anchorage are long and robust, with large number of sub-ropes arranged in parallel mode in order to increase mechanical strength....
This article reviews the origin and development of the Youth Symposium of Experimental Solid Mechanics (YSESM), since the first germinal idea to its tenth 2011 edition in Germany.