Temat: impact resistance - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Influence of friction stir welding on impact resistance of AlZn5Mg1 alloy joints
Wpływ zgrzewania tarciowego FSW na udarność złączy spajanych stopu AlZnSMgl
Autorzy:: Dudzik, K.
Czechowski, M.
Powiązania:: https://bibliotekanauki.pl/articles/242212.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: zgrzewanie tarciowe FSW
spawanie MIG
stopy aluminium
udarność
friction stir welding (FSW)
aluminium alloys
impact resistance
welding MIG
Opis:: The paper presents the research results on impact resistance of friction s tir welded aluminum alloy A W 7020 [AlZn5MglJ. The joints welded by traditional MIG method of the same aluminium alloy were chosen as reference points. Friction Stir Welding (FSW) - a new technology can be successfully used for butt welding of different types of aluminum alloy sheets. The parameters for friction stir welding of sheets made of AlZn5Mgl [7020] alloy were introduced in the article. Metallographic analysis of bonds showed proper structural construction of the friction stir welded 7020 aluminum alloys. The impact resistance was examined via the Charpy test according to PN-EN 10045-1. During test the hammer angle of deflection beta after hitting was noted and next the brake work "L " and impact resistance "U" were determined. The tests were carried out on typical specimens of cuboids shape (55x10x10 mm), with "V" notch. The research was conducted at the temperature of + 20°C. After impact resistance test the failure surface of specimens was analyzed by scanning with electron microscope SEM Philips XL30. The research of impact resistance showed that the values of 7020 alloy welded by FSW method were higher compared to the properties of 7020 alloy joints welded by traditional MIG method — the average impact resistance was about 18% higher in case ofFSW then in MG.
W artykule przedstawiono wyniki badań udarności złączy zgrzewanych tarciowo (FSW) stopu AW 7020 (AlZn5Mgl). Jako punkt odniesienia wybrano zlącza tego samego stopu spawane tradycyjną metodą MIG. Nową technologię zgrzewania tarciowego z przemieszaniem materiału zgrzeiny FSW (Friction Stir Welding) można z powodzeniem stosować do zgrzewania doczołowego blach z różnego rodzaju stopów aluminium. Przedstawiono parametry zgrzewania tarciowego (FSW) zastosowane do połączenia blach ze stopu AlZn5Mgl (7020). Analiza metalograficzna wykazała poprawną budowę strukturalną złączy zgrzewanych stopu aluminium 7020. Badania udarności przeprowadzono metodą Charpy'ego zgodnie z wymaganiami Polskiej Normy PN-EN 10045-1. Podczas badań odczytano kąt wychylenia młota po uderzeniu beta a następnie wyznaczono pracę łamania L oraz udarność U. Próbki do badań udarności wykonano jako standardowe, w kształcie prostopadłościanu o wymiarach 55x10x10 mm z zalecaną przez normę dokładnością š0,1 mm, w których wycięto karb w kształcie litery V. Próbę przeprowadzono w temperaturze + 20°C. Po badaniach udarności przeprowadzono analizę powierzchni przełomów próbek za pomocą mikroskopu elektronowego (SEM) Philips XL3O. Badania udarności złączy stopu 7020 wykazały wyższą wartość udarności w przypadku zastosowania zgrzewania tarciowego FSW w porównaniu do tradycyjnej metody spawalniczej MIG - średnio udarność była wyższa o ok. 18%.
Źródło:: Journal of KONES; 2009, 16, 3; 93-98
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 2.

Tytuł:: Numerical study of the projectile trajectory disturbing during the oblique impacts
Autorzy:: Morka, A.
Niezgoda, T.
Powiązania:: https://bibliotekanauki.pl/articles/244096.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: computational mechanics
impact problem
armour perforation
ballistic resistance
oblique impact
Opis:: The numerical investigations have been performed to determine the effect of the projectile trajectory disturbing during oblique impacts. An impact of the 14.5x118 mm B32 armour piercing projectile on the A12O3 different shape elements backed by 7017 aluminum alloy plate was analyzed. The oblique impact was realized by different shapes of the frontal ceramic elements, including hemispheres and pyramids, with respect to standard flat tiles. The influence of the impact point location was also under considerations. The Computer simulations were performed with the Element Free Galerkin Method (EFG) implemented in LS-DYNA code. full 3D models of the projectile and targets were developed with strain rate and temperature dependent material constitutive relations. The Johson-Cook model was applied to describe the metallic parts, while the ceramic was modelled by Johnson-Holmquist constitutive relations. The models of the projectile, ceramic and aluminium alloy targets were validated with utilization of the experimental datafound in literature. The obtained results confirmed that the projectile trajectory undergoes essential deviation because of the projectile angular velocity. The conditions for maximizing the value of this angular velocity were studied and it is possible to reach several radians per millisecond. The conclusions presented in this paper can be applied to develop modern impact protection panels where the appropriate balance between the mass and protection level must be accomplished.
Źródło:: Journal of KONES; 2010, 17, 3; 307-312
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 3.

Tytuł:: On the modelling of penetration/perforation problems
Autorzy:: Morka, A.
Powiązania:: https://bibliotekanauki.pl/articles/246015.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: computational mechanics
impact problem
armour perforation
penetration
ballistic resistance
Opis:: The aim of this paper was to present the main aspects of the numerical modelling within the scope of penetration/perforation problems. The most important stages of the computer model development were discussed in detail. They include the study of the hypervelocity impact physics, selection of the numerical solution method, problem discretization in time (time step) and space (mesh/grid), constitutive models consideration, Initial Boundary Conditions (IBC) and finally choice of the results form for analysis and discussion. The Computer simulations were performed with the Element Free Galerkin Method (EFG) implemented in LS-DYNA code. An impact of the 12. 7x108 mm B32 armour piercing projectile on the selected targets was analyzed. Full SD models of the projectile and targets were developed with strain rate and temperature dependent material constitutive relations. The models of the projectile, ceramic and aluminium alloy targets were validated with utilization of the experimental infield tests and data found in literature. The obtained results confirm that EFG method can be considered for numerical solving of the penetration/perforation problems. The errors in Depth of Penetration have not exceeded 20% as compared numerical and experimental results. The conclusions presented in this paper can be applied to develop modern impact protection panels where the appropriate balance between the mass and protection level must be accomplished.
Źródło:: Journal of KONES; 2010, 17, 1; 291-297
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 4.

Tytuł:: Numerical study of the shape effect in the ceramic based ballistic panels
Autorzy:: Morka, A.
Jackowska, B.
Niezgoda, T.
Powiązania:: https://bibliotekanauki.pl/articles/245901.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: computational mechanics
impact problem
armour perforation
ballistic resistance
ceramic armour
Opis:: The numerical investigations have been performed to determine the front surface shape effect in the cer based armour systems. Different shapes of ceramic elements were analyzed, including hemispheres and pyramids with respect to standard flat tiles. The influence of the impact point location was also under considerations. The Computer simulations were performed with the Element Free Galerkin Method (EFG) implemented in LS-D code. An impact of the 14.5xll8mm B32 armour piercing projectile on the A12O3 different shape elements backe 7017 aluminium alloy plate was analyzed. Full 3D models of the projectile and targets were developed with strain, rate and temperature dependent material constitutive relations. The models of the projectile, ceramic and aluminium alloy targets were validated with utilization of the experimental data found in literature. The obtained results confirm, the preliminary presumptions, that the shape of the front surface can significant role in the overall ballistic resistance of the panel. Particularly projectile-target initial contact area st to be important factor as showed by impact point location analysis. The conclusions presented in this paper can be applied to develop modern impact protection panels where the appropriate balance between the mass and protection level must be accomplished.
Źródło:: Journal of KONES; 2009, 16, 4; 539-548
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 5.

Tytuł:: Numerical analyses of ceramic/metal ballistic panels subjected to projectile impact
Autorzy:: Morka, A.
Nowak, J.
Powiązania:: https://bibliotekanauki.pl/articles/242960.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: computational mechanics
impact problem
armour perforation
ballistic resistance
ceramic armour
Opis:: The paper concerns research and development on modern, ceramic-based, protective layers used in the armour of tanks, combat vehicles and aeroplanes. A task of ceramic panels is reduction and dispersion of localized kinetic energy before a projectile or its fragment approaches the interior of protected object. The numerical investigations have been performed to determine the ballistic resistance of ceramic/metal panels subjected to projectile impact. The impact of the 7.62mm armour-piercing projectile on the ceramic elements backed by a metal plate was analyzed. The tested panels were composed of a ceramic layer (Al2O3, SiC or B4C) and a metal layer (7017 aluminium alloy, Armox 500T steel or Ti6Al-4 titanium alloy). Different shapes of ceramic elements were analyzed, including hemispheres and pyramids, with respect to standard flat tiles. The influence of the impact point location was also taken into considerations. The computer simulations were performed with the Finite Element Method implemented in LS-DYNA code. Full 3D models of the projectile and targets were developed with strain rate and temperature dependent material constitutive relations. The conclusions presented in the paper can be applied to develop modern impact protection panels in which the appropriate balance between the mass and protection level must be accomplished.
Źródło:: Journal of KONES; 2012, 19, 4; 465-472
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Informacja

Wyszukujesz frazę "impact resistance" wg kryterium: Temat

Źródło danych

Dostawca treści

Kolekcja

Rok wydania

Wydawca

Temat

Autor

Typ dokumentu

Język