Browsing by Subject "tensile strength"

Now showing 1 - 3 of 3

Access status: Open Access ,
An evaluation of the mechanical properties of 13MnSiCr7 steel by digital image correlation
(Wydawnictwa AGH, 2021) Kempny, Marcin; Rozmus, Radosław
"In this paper, the possibility of replacing tensile extensometers with a non-contacting device for measuring elongation has been analyzed. An example of a non-contacting device is a Digital Image Correlation System (DIC). Such systems are widely used in various areas, for example, biology or modern engineering. DIC systems have several advantages that seem to be promising for testing modern materials. The most important is the fact that there is no physical contact between the sample and the DIC and therefore no additional force is applied during the experiment. On the other hand, a lack of contact with the sample can cause large measurement inaccuracies. Another advantage would be that a DIC can measure strain on the whole surface of the sample in all directions, instead of measuring part of the surface in one direction like in other extensometers. Because of these abilities, the environment impact on test bench (DIC + load device), and differences between conducted experiment with normalized tensile test needed to be investigated. The testing machine was replaced by a DIC system cooperating with a tension-compression module. The proposed method was used to monitor and record the images to determine the basic properties of 13MnSiCr7 grade steel. Twelve tests were performed. The analysis was done by comparing the values of mechanical properties obtained in a static tensile test, such as yield strength, tensile strength, Young's modulus, elongation of the material"," with the values of these properties determined experimentally. For each sample, stress-strain curves were evaluated. To check if the results were correct, a Q-Dixon test was performed in each case, confidence intervals were also calculated. Finally, the obtained properties were compared with those from the standard tensile test acquired from the manufacturer's material card."
Access status: Open Access ,
The study of the tensile strength of AlSi21CuNiMg silumin in the final stage of solidification and the initial stage of cooling
(AGH University of Science and Technology Press, 2019) Romankiewicz, Remigiusz
The paper presents the results of tensile strength tests of AlSi21CuNiMg silumin made on a test stand. Silumin was under examination in an unmodified state and after modification with AlCu19P1.4 master alloy in quantity of 0.2% in relation to the mass of the alloy. Using a scanning microscope, the surface fractures obtained from tensile tests were tested. The structure and profiles of fractures were examined using an optical microscope. Modification of the tested silumin resulted in a favorable fragmentation and regular distribution of the crystals of the primary silicon in the alloy structure, which led to an almost twofold increase in the strength of the silumin samples at the final solidification stage from 3.5 to 6.6 MPa. As a result of these changes, the resistance of silumin to hot cracks should increase, which is of great importance when casting hypereutectic silumin in a metal mould that strongly inhibits the shrinkage of the castings.
Access status: Open Access ,
The tensile strength properties of lithological variety of Polish copper ores
(2012) Nad, Alona; Brożek, Marian; Naziemiec, Zdzisław
Artykuł przedstawia wyniki badań rozdrabniania pojedynczych ziaren przez ściskanie. Badania przeprowadzono na przykładzie trzech litologicznych odmian rud miedzi z kopalń Legnicko-Głogowskiego Okręgu Miedziowego: dolomit, łupek i piaskowiec. Wytrzymałość ziaren na rozciąganie była określana za pomocą jednoosiowego ściskania. Wytrzymałość na rozciąganie mineralnych ziaren charakteryzuje się dużym rozrzutem wyników. Rozrzut ten jest spowodowany wpływem losowych czynników takich jak warunki obciążenia, ułożenie ziarna, kształt ziarna oraz wewnętrzna struktura ziarna. W związku z tym wytrzymałość zbioru ziaren mineralnych charakteryzuje się pewnym rozkładem. Dystrybuanta rozkładu wytrzymałości jest wyrażona przez rozkład Weibulla, w którym parametry rozkładu są niezależne od wielkości ziaren. W artykule również zaprezentowane zależności średniej wytrzymałości dolomitu, łupku i piaskowca od rozmiaru ziaren.