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Wyświetlanie 1-3 z 3
Tytuł:
Compressive Strength of Steel Frames after Welding with Micro-Jet Cooling
Autorzy:
Hadryś, D.
Węgrzyn, T.
Piwnik, J.
Wszołek, Ł.
Węgrzyn, D.
Powiązania:
https://bibliotekanauki.pl/articles/351848.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
welding
micro-jet cooling
plastic properties
compressive tests
impact toughness
Opis:
Low carbon steel weld structures generally exhibit a very linear stress-strain relationship. In the study of strength of materials, the compressive strength is the capacity of a material or structure to withstand loads tending to reduce size of structure. It is mainly measured by plotting applied force against deformation in a testing machine. Compressive strength is a main key value for design of welded structures.The main goal of that paper was analysing of plastic properties of frame welds which were made with various parameters of micro-jet cooling. New technology of micro-jet welding could be regarded as a new way to improve plastic properties of welds. It allows to obtain welds with better mechanical properties in comparison to ordinary welding method. Furthermore it is possible to steering of weld structure and properties of the weld. There were given main information about influence of various micro-jet gases on metallographic and properties of structure steel welds.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 1; 123-126
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unconfined compressive strength of Lower Paleozoic shales from the Baltic Basin (northern Poland)
Autorzy:
Wojtowicz, Michał
Jarosiński, Marek
Pachytel, Radomir Władysław
Powiązania:
https://bibliotekanauki.pl/articles/2059581.pdf
Data publikacji:
2021
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
unconfined compressive strength
triaxial tests
empirical equations
shale reservoir
Baltic Basin
Opis:
Unconfined compressive strength of Lower Paleozoic shales from the Baltic Basin (northern Poland)Unconfined compressive strength (UCS) is one of the crucial parameters for geomechanical modelling of unconventional reservoirs useful for the design of hydraulic stimulation of hydrocarbon production. In spite of a large amount of UCS data collected from the Lower Silurian and Ordovician shale successions of the Baltic Basin (northern Poland), no comprehensive study on this subject has been published so far. Here, we compile the results of 247 single-stage confined compressive strength tests (CCST) provided by our industrial partner from four exploration boreholes. Based on the integration of these results with geophysical logging data, including dipole sonic logs, we derive empirical equations describing the relationship between UCS and Young’s modulus or sonic wave slowness. Considering the strong anisotropy of elastic properties in shales we have introduced different empirical equations for UCSv (vertical) and UCSh (horizontal), respectively perpendicular and parallel to bedding. The formula for UCSh is determined with less accuracy than for UCSv due to scarce laboratory tests with bed-parallel loading. Based on the empirical formula proposed, we have estimated the VTI-type of anisotropy to be in the range of 12–27%, depending on the lithostratigraphic formation. The results of our UCS estimations are compared with the results of multi-stage CCST from the adjacent borehole. Both confined tests yielded similar results for UCSv, with slightly higher values obtained from the multi-stage tests. In turn, a comparison of our solution with the results of true uniaxial compressive strength tests (UCST) for vertical samples from one of the studied boreholes revealed a significant discrepancy. The mean UCS results for shale formations from UCST are several times lower than those evaluated from the single-stage CCST. The usefulness of the results obtained for borehole breakout analysis is discussed.
Źródło:
Geological Quarterly; 2021, 65, 2; 65: 33
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of the strength parameters of pinewood based on the non-destructive sclerometric test with a wood hammer
Autorzy:
Szostak, Bartosz
Trochonowicz, Maciej
Kowalczyk, Mateusz
Powiązania:
https://bibliotekanauki.pl/articles/396645.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
pinewood
non-destructive tests
sclerometric test
compressive strength
drewno sosnowe
testy nieniszczące
testy sklerometryczne
wytrzymałość na ściskanie
Opis:
To assess the technical condition of a structure and design it using existing elements, it is necessary to know its parameters. For existing facilities, it is often not possible to get a sample of material and examine it directly in the laboratory. For this reason, in situ nondestructive testing is very important. The main goal of the paper is to present the issues related to determining the strength parameters of a particular wood based on the non-destructive sclerometric test performed with a wood sclerometric hammer. The study also presents the results of the impact of pinewood density on its compressive strength.
Źródło:
Civil and Environmental Engineering Reports; 2020, 30, 1; 43-52
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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