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    Wyświetlanie 1-8 z 8
    Tytuł:
    Numerical study for determination of pulse shaping design variables in SHPB apparatus
    Autorzy:
    Baranowski, P.
    Malachowski, J.
    Gieleta, R.
    Damaziak, K.
    Mazurkiewicz, L.
    Kolodziejczyk, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/200666.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Split-Hopkinson Pressure Bar
    pulse shape
    numerical studies
    parametrical study
    Opis:
    High strain rate experimental tests are essential in a development process of materials under strongly dynamic conditions. For such a dynamic loading the Split Hopkinson Pressure Bar (SHPB) has been widely used to investigate dynamic behaviour of various materials. It was found that for different materials various shapes of a generated wave are desired. This paper presents a parametric study of Split Hopkinson Pressure Bar in order to find striker’s design variables, which influence the pulse peak shape in the incident bar. With experimental data given it was possible to verify the developed numerical model, which was used for presented investigations. Dynamic numerical simulations were performed using explicit LS-Dyna code with a quasi-optimization process carried out using LS-Opt software in order to find striker’s design variables, which influence the pulse peak shape.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2013, 61, 2; 459-466
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Split Hopkinson Pressure Bar impulse experimental measurement with numerical validation
    Autorzy:
    Baranowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/221627.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Split-Hopkinson Pressure Bar
    impulse measurement
    experimental testing
    numerical studies
    Opis:
    Materials and their development process are highly dependent on proper experimental testing under wide range of loading within which high-strain rate conditions play a very significant role. For such dynamic loading Split Hopkinson Pressure Bar (SHPB) is widely used for investigating the dynamic behavior of various materials. The presented paper is focused on the SHPB impulse measurement process using experimental and numerical methods. One of the main problems occurring during tests are oscillations recorded by the strain gauges which adversely affect results. Thus, it is desired to obtain the peak shape in the incident bar of SHPB as “smooth” as possible without any distortions. Such impulse characteristics can be achieved using several shaping techniques, e.g. by placing a special shaper between two bars, which in fact was performed by the authors experimentally and subsequently was validated using computational methods.
    Źródło:
    Metrology and Measurement Systems; 2014, 21, 1; 47-58
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quasi-Static and Dynamic Testing of Carbon Fiber Reinforced Magnesium Composites
    Autorzy:
    Ranachowski, Z.
    Ranachowski, P.
    Brodecki, A.
    Kopeć, M.
    Kudela, S. jr.
    Powiązania:
    https://bibliotekanauki.pl/articles/351742.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Mg matrix composite
    compressive properties
    carbon fiber
    Split-Hopkinson Pressure Bar
    Opis:
    Two types of composites, consisting of pure magnesium matrix reinforced with two commercially used carbon fibers, were systematically studied in this paper. The composites fabricated by the pressure infiltration method, were subjected to quasistatic and dynamic compression tests. Morphology of fiber strands was observed using scanning electron microscope (SEM). The application of carbon fibre reinforcement led to the stiffening of tested materials, resulting in the limitation of the possible compression to approx. 2.5%. The performed tests revealed the remarkable difference in compression strength of investigated compositions. The cause of that effect was that GRANOC fiber reinforced composite exhibited insufficient bond quality between the brittle fibers and the ductile matrix. T300 reinforced composite presented good connection between reinforcement and matrix resulting in increased mechanical properties. Investigated composites demonstrated higher mechanical strength during deformation at high strain rates. Microscopic observations also proved that the latter fibers with regular shape and dense packaging within the filaments are proper reinforcement when designing the lightweight composite material.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 2; 893-899
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tensile Split Hopkinson Bar Technique: Numerical Analysis of the Problem of Wave Disturbance and Specimen Geometry Selection
    Autorzy:
    Panowicz, R.
    Janiszewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/221235.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Split Hopkinson Pressure Bar
    tension testing
    numerical analysis
    strain-rate effects
    Opis:
    A method of tensile testing of materials in dynamic conditions based on a slightly modified compressive split Hopkinson bar system using a shoulder is described in this paper. The main goal was to solve, with the use of numerical modelling, the problem of wave disturbance resulting from application of a shoulder, as well as the problem of selecting a specimen geometry that enables to study the phenomenon of high strain-rate failure in tension. It is shown that, in order to prevent any interference of disturbance with the required strain signals at a given recording moment, the positions of the strain gages on the bars have to be correctly chosen for a given experimental setup. Besides, it is demonstrated that - on the basis of simplified numerical analysis - an appropriate gage length and diameter of a material specimen for failure testing in tension can be estimated.
    Źródło:
    Metrology and Measurement Systems; 2016, 23, 3; 425-436
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Filler Surface Modification on Static and Dynamic Mechanical Responses of Rice Husk Reinforced Linear Low-Density Polyethylene Composites
    Autorzy:
    Omar, Mohd Firdaus
    Al Bakri Abdullah, Mohd Mustafa
    Ting, Sam Sung
    Jeż, Bartłomiej
    Nabiałek, Marcin
    Md Akil, Hazizan
    Zulkepli, Nik Noriman
    Abd Rahim, Shayfull Zamree
    Azmi, Azida
    Powiązania:
    https://bibliotekanauki.pl/articles/2106572.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    silane coupling agents
    strain rate
    universal testing machine
    split Hopkinson pressure bar
    strain rate sensitivity
    Opis:
    Filler surface modification has become an essential approach to improve the compatibility problem between natural fillers and polymer matrices. However, there is limited work that concerns on this particular effect under dynamic loading conditions. Therefore, in this study, both untreated and treated low linear density polyethylene/rice husk composites were tested under static (0.001 s-1, 0.01 s-1 and 0.1 s-1) and dynamic loading rates (650 s-1, 900 s-1 and 1100 s-1) using universal testing machine and split Hopkinson pressure bar equipment, respectively. Rice husk filler was modified using silane coupling agents at four different concentrations (1, 3, 5 and 7% weight percentage of silane) at room temperature. This surface modification was experimentally proven by Fourier transform infrared and Field emission scanning electron microscopy. Results show that strength properties, stiffness properties and yield behaviour of treated composites were higher than untreated composites. Among the treated composites, the 5% silane weight percentage composite shows the optimum mechanical properties. Besides, the rate of sensitivity of both untreated and treated composites also shows great dependency on strain rate sensitivity with increasing strain rate. On the other hand, the thermal activation volume shows contrary trend. For fracture surface analysis, the results show that the treated LLDPE/RH composites experienced less permanent deformation as compared to untreated LLDPE/RH composites. Besides, at dynamic loading, the fracture surface analysis of the treated composites showed good attachment between RH and LLDPE.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 2; 507--519
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic splitting tensile performance of new and old concrete after high temperature treatment
    Autorzy:
    Cao, Hai
    Powiązania:
    https://bibliotekanauki.pl/articles/2033990.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    beton nowy
    beton stary
    SHPB
    dynamic splitting tensile performance
    prędkość uderzenia
    temperatura
    new concrete
    old concrete
    split Hopkinson pressure bar
    impact velocity
    temperature
    Opis:
    In order to study the dynamic splitting tensile properties of new and old concrete after high temperature treatment, the effects of different impact velocities and temperatures on failure modes, dynamic splitting strength and energy absorption of new and old concrete were analyzed by impact dynamic splitting tensile test use of variable cross-section Φ 74 mm split Hopkinson pressure bar apparatus. The results show that: Impact velocity and temperature not only affect the dynamic splitting strength of new and old concrete bonding specimens, but also affect the failure modes and degree of breakage. The dynamic splitting strength of new and old concrete increases with the increase of impact velocity, but the increase rate decreased with the increase of temperature. The dynamic splitting strength first increases slowly and then decreases dramatically with the increase of temperature. In the dynamic splitting test of new and old concrete, the energy absorption increases with the increase of impact velocity and decreases with the increase of temperature.
    Źródło:
    Archives of Civil Engineering; 2021, 67, 4; 79-89
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental investigation of dynamic behavior of silty sand
    Eksperymentalne badanie dynamicznego zachowania piasku pylastego
    Autorzy:
    Chmielewski, Ryszard
    Kruszka, Leopold
    Rekucki, Ryszard
    Sobczyk, Kamil
    Powiązania:
    https://bibliotekanauki.pl/articles/1853632.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mechanika gruntu
    badanie eksperymentalne
    badanie dynamiczne
    pręt Hopkinsona dzielony
    badanie edometryczne
    piasek pylasty
    soil mechanics
    experimental test
    dynamic test
    split Hopkinson pressure bar
    oedometric test
    silty sand
    Opis:
    The paper includes experimental research using the Split Hopkinson Pressure Bar to determine dynamic compression curves and strength dynamic parameters to depend on the strain rate and moisture for silty sand soil samples. Those experiments are oedometric type based in a rigid confining cylinder. Samples of silty sand with fine a fraction content were taken for the study. To ensure sufficiently uniaxial strain of the tested material, the soil samples were placed in properly prepared casings made of duralumin for the needs of the tests. Thanks to the use of measuring strain gauges on the initiating and transmitting bars, as well as the casing, the nature of the loading pulse was obtained, which was then subjected to the process of filtration and data processing to obtain the nature of the incident, reflected and transmitted wave. During the above dynamic experiments with the representative of silty sand soils, it was observed that its dynamic compaction at a high strain rate is different than in the case of the Proctor test. This is due to higher compaction energy, which additionally changes the grain size by destroying the grains in the structure. The paper presents the results of particle size distribution analysis for two different types of soil samples - this type of analysis is unique. Hence experiments should be further continued for such soils with different granulations and various moisture using, for example, Hopkinson measuring bar technique to confirm for other silty sand soils that are often subgrade of various engineering objects.
    Artykuł obejmuje edometryczne badania eksperymentalne z wykorzystaniem techniki pręta Hopkinsona do określenia zarówno dynamicznego zachowania jak i zmian struktury dla próbek wybranego ośrodka gruntowego o różnej wilgotności poddanych oddziaływaniu dynamicznemu. Do badania wzięto piasek pylasty (siSa) o zawartości frakcji drobnych fi+fπ = 20,46%. W celu zapewnienia wystąpienia jednoosiowego stanu odkształcenia badanej próbki gruntu umieszczono ją w odpowiednio przygotowanej duraluminiowej osłonie pierścieniowej. Dzięki zastosowaniu tensometrów pomiarowych na prętach inicjującym oraz transmitującym, jak również osłonie zarejestrowano różne impulsy, które następnie poddano procesowi filtracji i obróbki danych, tak aby otrzymać obrazy propagacji sprężystych fal w prętach pomiarowych i w osłonie. Wykorzystując odpowiednie równania oraz zależności zmodyfikowanej metody Kolsky'ego dla trójwymiarowego stanu naprężenia w badanej próbce określono eksperymentalne zależności charakteryzujące zachowanie się próbek gruntu o różnej wilgotności: naprężenie ϭ(t), odkształcenie ε(t) oraz prędkość odkształcenia έ(t) w funkcji czasu. Na tej podstawie uzyskano krzywe ściskania dynamicznego dla różnej wilgotności próbek gruntu pylastego z określonymi wartościami początkowego dynamicznego edometrycznego modułu oraz lokalnych maksymalnych naprężeń plastycznych i odpowiadających im odkształceń. Podczas powyższych eksperymentów dynamicznych z próbkami gruntów typu piasku pylastego zaobserwowano, że jego dynamiczne zagęszczenie przy dużej szybkości odkształcania jest inne niż w przypadku testu Proctora. Wynika to z większej energii zagęszczania, która dodatkowo powoduje zmianę uziarnienia poprzez niszczenie ziaren w strukturze. W pracy przedstawiono wyniki analizy zmian uziarnienia dla dwóch różnych rodzajów próbek gruntu - tego typu analizy są unikalne. W związku z tym należy kontynuować eksperymenty dla takich gruntów o różnych granulacjach i różnej wilgotności, stosując technikę prętów pomiarowych Hopkinsona, w celu potwierdzenia opisanego zjawiska w innych gruntach typu piasku pylastego, które często są podłożem gruntowym dla różnych obiektów inżynieryjnych.
    Źródło:
    Archives of Civil Engineering; 2021, 67, 1; 481-498
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical study of dynamic behaviors of concrete under various strain rates
    Autorzy:
    An, H. M.
    Liu, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/230844.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    zachowanie dynamiczne
    beton
    model Holmquist-Johnson-Cook
    HJC
    pasek ciśnienia Hopkinsona rozdzielony
    SHPB
    pęknięcie
    podział
    dynamic behavior
    concrete
    Holmquist-Johnson-Cook model
    split Hopkinson pressure bar
    fracture
    fragmentation
    Opis:
    As the dynamic behavior of the concrete is different from that under static load, this research focuses on the study of dynamic responses of concrete by simulating the split Hopkinson pressure bar (SHPB) test. Finite element code LS-DYNA is used for modeling the dynamic behaviors of concrete. Three continuous models are reviewed and the Holmquist-Johnson-Cook model (HJC) is introduced in detail. The HJC model which has been implemented in LS-DYNA is used to represent the concrete properties. The SHPB test model is established and a few stress waves are applied to the incident bar to simulate the dynamic concrete behaviors. The stress-strain curves are obtained. The stress distributions are analyzed. The crack initiation and propagation process are described. It is concluded that: the HJC model can modeling the entire process of the fracture initiation and fragmentation; the compressive of the concrete is significantly influenced by the strain rates.
    Źródło:
    Archives of Civil Engineering; 2019, 65, 4; 21-36
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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