Papers by Keyword: Testing

Abstract: The effectiveness of FRP systems as a confinement technique to strengthen masonry columns has been widely investigated in the last decades. Recently, a new technique, Fabric Reinforced Cementitious Matrix (FRCM), based on the use of fibrous nets embedded in inorganic matrix, has been developed and investigated as a strengthening solution in masonry buildings. Actually, the number of experimental tests on masonry columns confined by using FRCM systems is very limited, especially for real scale specimens. To fill such gap an experimental program aimed at investigating the behaviour of full scale columns made of limestone masonry blocks confined with different FRCM systems has been carried out. The results of four uniaxial compression tests are illustrated and discussed. The used FRCM systems are made with glass and basalt dry nets embedded in a lime-based mortar. The influence of transverse confinement by using internal reinforcement in forms of pultruded GFRP bars has been also investigated. The mechanical properties of the confined specimens resulted increased in terms of load-carrying capacity and ultimate axial strain.

Abstract: The authors deal with the importance and significance of fire retardants for fire protection in practice. The main aim of this paper is to inform the readers about the possibilities of wood modifications by fire retardants. The authors present the experiment of testing wood specimens applying the experimental scientific method of test for limited flame spread on the test bench under laboratory conditions. The results of the experiment represent fire-technical characteristics that describe the wood behavior during the process of combustion. Different types of fire retardants are evaluated according to the selected evaluation criterion - the weight loss of test specimens. The conclusion summarizes the results of the experiment and recommendations for fire retardant modification in practice.

Abstract: The Junkers F13 airplane, which began production in 1919, was the first plane to be built using aluminum aerospace alloys. Nearly 100 years later, approximately 1,800 new planes are being built each year with aluminum aerospace alloys. For the five trillion or so dollars worth of existing aging airplanes, cost of aerospace corrosion in United States alone is an estimated 23 billion dollars per year. In addition, hidden corrosion costs have contributed to a bigger impact in the commercial aircraft industry. In 1988, in the corrosion sensitive environment of the Hawaiian islands, an Aloha Airlines 737 aircraft suffered an in-flight failure due to crevice corrosion in the lap joint of the fuselage. After this event, the aviation technical community launched a new era of advanced technology, improved procedures and higher standards for maintaining the world’s aging and corroding aircraft. This paper discusses types of corrosion that affect aluminum aerospace alloys including crevice corrosion, pitting, exfoliation, intergranular, stress corrosion cracking (SCC) and corrosion fatigue. Standardized testing to determine if the alloy is susceptible to these types of corrosion is explained and examples of how to mitigate certain types of corrosion is discussed.

Abstract: The article deals with verification and testing of proposed technical solution for automated assembly of electrical sockets at research robotized workstation. Based on the 3D and 2D design documentation was realized this workplace at the Department of Robotics. Research robotized workplace is built from industrial robot SCARA, palletizer and de-palletizer, vibratory conveyor and vibratory trays, replacing device of effectors and universal gripper, and also from others components (control PC, Main PC, rotary and linear modules).

Abstract: Please make the page settings of your word processor to A4 format (21 x 29,7 cm or 8 x 11 inches); with the margins: bottom 1.5 cm (0.59 in) and top 2.5 cm (0.98 in), right/left margins must be 2 cm (0.78 in)This paper is based on a project is entitled “Implementation of a Test Bed for Supercapacitor Testing and Evaluation” that is intended to perform tests and evaluate the behavior and characteristics supercapacitors. The test bed can perform charging and discharging of different types of supercapacitors. This implementation serves to automatically acquire the data from the testing procedure and plot in real time the graphs for monitoring the charging and discharging behaviour. From there, the test bed can determine the two significant characteristics of the supercapacitor, which are the capacitance value in Farad and the equivalent series resistance (ESR) in Ohm. The capacitance value is obtained using the measurements taken during the discharging process while the ESR is determined by measurements taken when it is charged using a constant current. The test bed can select between different modes of charging depending of the type of supercapacitor put to test. It can measure and evaluate capacitance ranges from 0.1F to 10F. This paper will discuss the methodologies that the test bed implements for testing the supercapacitors, and the results obtained from evaluation of several types of supercapacitors. We shall be able to publish your paper in electronic form on our web page http://www.scientific.net, if the paper format and the margins are correct. Your manuscript will be reduced by approximately 20% by the publisher. Please keep this in mind when designing your figures and tables etc. It is found the test bed can approximately read the values of supercapacitors that have low ESR ranges.

Abstract: This paper is focused on carrying capacity testing of five different types of membrane connections. Three reference samples for each type of connection were tested for tensile strength. Low measured peak force value and especially the way breakage outside of the join indicative of a wrong material, and not on the connection. The obtained values were compared with technical datasheet of the material manufacturer, which has been non-compliance. It confirms the assumption that the material was changed, which could harm to the user.

Abstract: In accordance with the Russian Federation State program called “Industrial growth and improving competitiveness” it becomes more wide-spread to use thin-walled makes for pieces, modern materials with new treating methods in mechanical engineering, in automobile production and modern aviation industry. As well as requirements for quality and mechanical characteristics of finished products constantly grow. In relation to these standards, methods of intensive irreversible deformation under conditions of complex stressed state are used with increasing frequency. Study of the following parameters has a great practical importance: loaded capability of the makes during exploitation and work material strength performance under complex production process. Such strain tasks are frequently counted as most complex and demand experimental verification because of geometric and physical task nonlinearity.The current study proposes testing method for thin-walled tubular workpieces which combines implementation simplicity with a wide range of strain-stressed state charts.

Abstract: This paper presents a comparative study regarding the specific components from thermoplastic polymers and ceramic powders for a assistant robot. Experimental research targets the testing of these materials in order to optimize the vertebrae of the robot. The vertebrae are part of a miniature robot (size, weight) for exploration and interventions in a limited space. The simplicity and small size are advantageous for reliability, safety, fast installation and ease of use. Knowing the friction coefficient shows a great importance, particularly in the friction coupling in which movement occurs with low speeds.

Abstract: The automotive industry represents one of the most important segments of the world economy that has to be in a continue development. The latest procedures for determination of an internal combustion engine performance have a big acquisition cost and demand special conditions even if the tested engine has smaller dimensions. The present paper presents other accessible solutions for this matter.

Abstract: Comparison of basic thermal insulation properties of triple glazing and quadruple glazing. It also compares the heat transfer coefficient of glazing, transmittance of solar radiation, the weight of glass and other basic properties of glazing. It deals with the effect of number and position of low-emission coating the quadruple glazing on the heat transfer coefficient. Reducing weight of quadruple glazing using thin heat-strengthened glass and dimensional constraints.