Acta Mechanica Slovaca, 2012 (vol. 16), issue 2
Impact Assessment of Calibration Parameters on Accuracy Method of Digital Image Correlation
Róbert Huňady, Martin Hagara, Martin Schrötter
Acta Mechanica Slovaca 2012, 16(2):6-12 | DOI: 10.21496/ams.2012.012 
This article deals with factors, which influence accuracy of measured data obtained by method of digital image correlation, specifically by the system Q-450 from the company Dantec Dynamics. The attention is mainly focused on calibration of cameras and in detail it is remitted on its affect the accuracy of the results.
System of Collecting and Recycling of the Portable Batteries and Accumulators in Slovakia
Králiková Ružena, Badida Miroslav, Andrejiová Miriam
Acta Mechanica Slovaca 2012, 16(2):14-20 | DOI: 10.21496/ams.2012.013
The contribution deals with problems of collection and recycling of portable battery and accumulators. Analyzed knowledge, conclusions and methods was summarized to suggest methodology of collection optimization of used transferable germs and accumulators. This methodology for optimal draft to effective settling of appropriate system of collection, processing, evaluation and recyclation of used portable batteries and accumulators was created according to current legislation.
Strain Fields Identification of Chosen Cycling Helmets Types by Their Impact Loading
František Trebuňa, Martin Hagara, Róbert Huňady
Acta Mechanica Slovaca 2012, 16(2):22-30 | DOI: 10.21496/ams.2012.014
The use of a modern digital image correlation method to investigation of drop tests of two chosen cycling helmets types is described in this contribution. The first type - Arcore T-16 represents the helmets with more rounded uncomplicated surface and the second one - Longus Entry has flatter but more complicated contour. The investigation was directed to determination of helmets deformation and strain fields during their impact to a barrier. A high-speed system Q-450 Dantec Dynamics with cameras SpeedSense9070 Phantom was used to shoot this short time interval.
The Application of Simulation Methods for Modeling Mechatronic Systems
Ľubica Miková, František Trebuňa
Acta Mechanica Slovaca 2012, 16(2):32-36 | DOI: 10.21496/ams.2012.015
Computer-aided modelling of kinematics and dynamics of robots is an important integrated part within the frame of a modern approach to the design of technical subjects (machines, apparatuses, motor-cars, planes, etc.). It is possible to verify a large spectrum of applications, which can be typical for operation of the simulated subject. Application of the simulation methods enables to accelerate a development process and to improve design of the wheel undercarriage structures of mobile robots.
Analysis of Stress Fields Relate to Plastic Deformation of the Steel Sheets
Michaela Štamborská, František Šimčák
Acta Mechanica Slovaca 2012, 16(2):38-43 | DOI: 10.21496/ams.2012.016
The article is focused on identification the stress fields related to strain fields by using digital image correlation (DIC) and to verify the results obtained using the finite element method (FEM). Particular attention is devoted to the analysis of deformation in area of stress concentration (near notch). The virtual field method is using to determine the stress fields connected with displacement fields, which was elaborated for analysis of an elasto plastic deformation by Grédiac and Pierron. These procedures are applied to determine the properties of cold rolled steel used for automobile industry. For analysis was used uncoated sheet of isotropic...
Forming of Semi - Finished Drill Parts by Means of Rolling - Extrusion
Jarosław Bartnicki
Acta Mechanica Slovaca 2012, 16(2):44-47 | DOI: 10.21496/ams.2012.017
The method of semi - finished drill parts forming by means of rolling - extrusion process is show in this work. Application of Finite Element Method (FEM) allows for analyzing this process with application of different kinematics parameters. Chosen in numerical calculations cases of rolling - extrusion were verified in laboratory conditions with use of prototype aggregate PO-1. The billets for these tests were made from commercially pure lead. Obtained results confirmed possibility of rolling - extrusion technology application in proposed scope of application.
Numerical Analysis of Passive Safety of Street Lighting Posts
A. Skrzat
Acta Mechanica Slovaca 2012, 16(2):48-53 | DOI: 10.21496/ams.2012.018
One of the most important goal in designing of street lighting posts is the fulfillment of requirements of EN 12767 standard which refers to passive safety of road constructions. Lighting posts should reduced overload force when stroked by a passenger car. Experimental investigations involving real posts and cars are relatively expensive, and provide the information about passive safety of existing posts only. In numerical simulations the passive safety of various types of lighting posts might be investigated. Obtained results provide hints about possible modifications necessary to change the level of energy absorption and car passengers safety. The...
Application of Genetic Algorithm for Optimization of Neural Networks for Selected Tribological Test
Tomasz Trzepieciński, Hirpa Lemu Gelgele
Acta Mechanica Slovaca 2012, 16(2):54-60 | DOI: 10.21496/ams.2012.019
In this work was presented the method of determination of the friction coefficient by using multilayer artificial neural networks on the basis of experimental database obtained from the strip drawing test. Using genetic algorithm the optimization of number of input variables of artificial neural networks has been done. As an input parameters for training artificial neural networks following parameters has been used: surface parameters of the sheet and dies, sheet material parameters and clamping force. Some results have pointed out that genetic algorithm has been successfully appled to optimization of training set.
Solid Liquid Non-Newtonian Fluid Flow in Pipe: A Review
Mishra S., Chandra H., Arora A.
Acta Mechanica Slovaca 2012, 16(2):62-73 | DOI: 10.21496/ams.2012.020
The flow of rheologically complex fluids in industrial equipment poses a number of challenges, not least from a modeling point of view. Research is needed to further understand and be able to predict the flow behavior of such materials and to investigate ways of improving their processing. The Non-Newtonian Solid-Liquid fluid flow behavior in horizontal and vertical pipes can be predicted by various methods which are mention in the paper. In the literature, it is also shows that Computational Fluid dyanamices (CFD) has sufficient capability to deal with such type of flow and was capable of giving predictions of pressure drop which were probably better...
Mechanical Properties of Thoracic and Abdominal Arteries of Sheep
Kadri Salim, Bouchelaghem Abdelaziz Mahmoud, Lemouchi Karim
Acta Mechanica Slovaca 2012, 16(2):74-76 | DOI: 10.21496/ams.2012.021
An accretion dalliance is accorded by biotechnology, in general, and biomaterials, in particular, in determining the mechanical properties of different biological tissues comprising or composing the living creatures' bodies. Their microscopic and macroscopic structures are complex and mechanical tests can be of a major in studying their mechanical properties [1] [2] [3].During operation, any blood circulation system is subject to an alternating blood pressure and the constituent organs behave differently. Amongst the rudimentary mechanical tests to characterize thoracic and abdominal arteries, and soft tissues as well - vital components of the...
End-of-life Vehicle Recycling at the Disposal Stage
B. Pawłowska
Acta Mechanica Slovaca 2012, 16(2):78-82 | DOI: 10.21496/ams.2012.022
Automobile recycling is a positive contribution to the reduction of many environmental impacts. In fact efficient utilization of resources by reusing discarded materials or using them as energy sources lessens the impact on the environment due to the depletion of natural resources and the potential pollution related to disposal to landfill. At present, approximately 75% to 80% of end-of-life vehicles in terms of weight is being recycled. However, the remaining 20% to 25% in weight, consisting of heterogeneous mix of materials (rubber, glass, textile, etc.) is still being discarded and disposed of as waste in landfills. In order to most effectively...
Unsteady Boundary Layer Flow of an Incompressible Micropolar Fluid Over a Porous Stretching Sheer
K. Govardhan, S. Renuka, N. Kishan
Acta Mechanica Slovaca 2012, 16(2):84-90 | DOI: 10.21496/ams.2012.023
Aim of the paper is to investigate the unsteady boundary layer flow of an incompressible micropolar fluid over a stretching porous sheet when the sheet is stretched in its own plane. The stretching velocity is assumed to vary linearly with the distance along the sheet. Two equal and opposite forces are impulsively applied along axis so that the sheet is stretched, keeping the origin fixed in a micropolar fluid. The governing non-linear equations and their associated boundary conditions are first cast into dimensionless form by a local non-similarity transformation. The resulting equations are solved numerically using the Adams- predictor corrector...