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Tytuł:
Experimental study on SHPB cyclic impact of rubber-cement composite with different confine modes
Autorzy:
Yang, Rongzhou
Xu, Ying
Chen, Peiyuan
Cheng, Lin
Ding, Jinfu
Fu, Hongxin
Powiązania:
https://bibliotekanauki.pl/articles/27312124.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
dzielony pręt Hopkinsona
polimer wzmocniony włóknem węglowym
kompozyt gumowo-cementowy
oddziaływanie cykliczne
energia pękania
uszkodzenie
odporność na uderzenia
split Hopkinson pressure bar
carbon fibre reinforced polymer
rubber-cement composite
cyclic impact
damage
fracture energy
impact resistance
Opis:
To promote the application of rubber-cement composites as the main bearing structure and key components in practical engineering under frequent dynamic disturbances, in this work, the split Hopkinson pressure bar (SHPB) cyclic impact tests of rubber-cement composite specimens with four different confine modes were carried out in which the impact load increased sequentially. The relationship between average strain rate, ultimate strain and impact times and the relationship between peak stress, damage energy, ultimate strain and incident energy were analyzed. The results showed that the appropriate confine reinforcement treatment can make rubber-cement composite give full play to its deformation ability when it was completely damaged. Carbon fiber-reinforced polymer (CFRP) sheet and steel cylinder can work together with the rubber-cement composite matrix to resist impact load, which effectively improves the structural strength, damage fracture energy, and cyclic impact resistance of the rubber-cement composite. Finally, based on the effect difference of confine modes, the simplified plane force models of rubber-cement composite specimens with four different confine modes were established, which clearly revealed the completely different impact resistance mechanism of the rubber-cement composites with different constraints under cyclic impact loading.
Źródło:
Archives of Civil Engineering; 2023, 69, 2; 517--534
1230-2945
Pojawia się w:
Archives of Civil Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of ballistic performance of armor steels based on the split Hopkinson shear bar data
Autorzy:
Walicki, Marek
Janiszewski, Jacek
Cieplak, Kamil
Powiązania:
https://bibliotekanauki.pl/articles/2086939.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
split Hopkinson pressure bar
high strain-rate shearing
ballistic resistance
armor steels
Opis:
The paper presents a method of assessing of ballistic resistance of four armor steels based on the results of shear tests under dynamic load conditions. All shear tests were performed using a newly developed flat material specimen with two shear zones. High strain-rate experiments were performed using the spilt Hopkinson pressure bar technique. In addition, the V50 ballistic resistance tests for the armor steels were carried out. The maximum value of the shear strain energy density (SSED) was adopted as the evaluation criterion. The SSED parameter takes the highest average value for the armor steel with the highest ballistic resistance.
Źródło:
Journal of Theoretical and Applied Mechanics; 2022, 60, 1; 129--140
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic Characterization and Constitutive Modelling of ARMSTAL 500 Steel
Autorzy:
Tria, D. E.
Trębiński, R.
Powiązania:
https://bibliotekanauki.pl/articles/403943.pdf
Data publikacji:
2015
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
Johnson-Cook strength model
damage models
Split Hopkinson Pressure bar
material tests
LS DYNA Explicit
Opis:
The behaviour of a high strength steel (ARMSTAL 500) has been investigated using a combination of quasistatic and dynamic tests for a wide strain-rate range 1·10⁻⁴ – 3·10³ s⁻¹. A uniaxial testing machine and a Split Hopkinson Pressure Bar (SHPB) have been used under well controlled testing conditions. Next, the effect of the strain hardening, the strain rate hardening, loading history and stress triaxiality on the strength and ductility of the material has been studied. The present work also describes constitutive and damage models and their implementation available in the nonlinear finite element code LS DYNA. Calibration of constitutive model parameters and damage criteria is most often accomplished via regression techniques applied to laboratory data. A 3D numerical simulation of perforation of ARMSTAL 500 plates with 7.62 × 51 mm AP projectile were carried out with detailed models of target and compared with experiment in order to validate the calibrated models. As it will be shown, ARMSTAL 500 steel is a high strength steel with modest strain-rate sensitivity. The study indicates that the penetration depth can be predicted quantitatively and qualitatively with MJC hardening parameters calibrated from compression tests. The Modified Johnson–Cook constitutive model with Cockcroft and Latham failure model can predict the projectile residual speed and the fragmentation process followed very closely by MJC failure criteria.
Źródło:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2015, 6, 3 (21); 19-40
2081-5891
Pojawia się w:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Preparation of the non-cohesive soil sample and calibration of the pneumatical launcher in the dynamic soil test SHPB
Autorzy:
Sobczyk, Kamil
Kruszka, Leopold
Grązka, Michał
Chmielewski, Ryszard
Rekucki, Ryszard
Powiązania:
https://bibliotekanauki.pl/articles/2073393.pdf
Data publikacji:
2022
Wydawca:
Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
Tematy:
sample preparation
non-cohesive soil
launcher calibration
soil dynamic testing
split Hopkinson pressure bar
SHPB
przygotowanie próbki
grunt niespoisty
kalibracja wyrzutni
badanie dynamiczne gleby
dzielony pręt Hopkinsona
Opis:
The paper analyzes the problem of initial compaction of a non-cohesive soil sample on the example of dry silty sand samples. Two different compaction methodologies were used: I) dynamic compaction - using split Hopkinson pressure bar and II) vibration compaction - using a vibrating shaker. A better result of the compaction process was obtained for dynamic compaction with an initial pressure value of 0.5 bar (small difference in the result - both methods obtained comparable results). The paper also includes a numerical analysis of the calibration of the pneumatic launcher in the Matlab environment on the basis of the system of difference equations. The calibration process was carried out in the initial pressure range from 0.5 to 3.0 bar for three different variants of the barprojectile length: 100 mm, 200 mm and 250 mm and compared with the experimental analysis - the results were consistent.
Źródło:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych; 2022, 1; 16--27
2450-1859
2450-8721
Pojawia się w:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Selected technical and legal aspects of the pneumatic launcher operation for Hopkinson measuring bars set
Autorzy:
Sobczyk, Kamil
Kruszka, Leopold
Chmielewski, Ryszard
Rekucki, Ryszard
Powiązania:
https://bibliotekanauki.pl/articles/111009.pdf
Data publikacji:
2020
Wydawca:
Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.
Tematy:
pneumatic launcher
split Hopkinson bar
test stand operation
Opis:
The paper presents selected technical and legal areas of the exploitation of a pneumatic launcher as an essential part of the mechanical test stand of the split Hopkinson bar for testing the dynamic properties of construction materials. The process of impact loading of the tested material sample is carried out by means of a loading bar-projectile fired from this launcher. The concept of the first stage of the modernization of the pneumatic launcher used at the Institute of Civil Engineering of the Military University of Technology (MUT) for over 20 years was discussed in order to facilitate the performance of physical experiments. The formal and legal requirements for the design, construction and usage of a test stand with a pneumatic launcher in a laboratory room are presented.
Źródło:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych; 2020, 3; 1-10
2450-1859
2450-8721
Pojawia się w:
Inżynieria Bezpieczeństwa Obiektów Antropogenicznych
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties and Structure of X30MnAlSi26-4-3 High Strength Steel Subjected to Dynamic Compression Processes
Autorzy:
Śmiglewicz, A.
Jabłońska, M.
Moćko, W.
Kowalczyk, K.
Hadasik, E.
Powiązania:
https://bibliotekanauki.pl/articles/355215.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high strength steel
dynamic compression
split Hopkinson bar
share bands
Opis:
The paper presents the results of investigation on X30MnAlSi26-4-3 austenitic steel subjected to dynamic compression using the split Hopkinson pressure bar. The strain rate was 3700 s-1. The compression test was also carried out without the use of breaking rings and then true strain was about 0.3. The split Hopkinson pressure bar test take only few milliseconds to complete during which time it is impossible to transfer the excess heat out of the specimen, therefore the test must be carried out in adiabatic conditions and so the increase of the temperature caused by the work of plastic deformation had to be calculated. The stepping load method was used in order to evaluate the effect of adiabatic heating on the properties of steel which allowed to maintain the isothermal deformation conditions. The paper presents the comparison of results obtained during deformation under adiabatic and isothermal conditions in correlation to structure changes occurring in course of dynamic compression.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 4; 2255-2260
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quasi-Static and Dynamic Mechanical Properties of a Ti-6Al-4V Titanium Alloy Produced Using Unconventional Manufacturing Methods
Quasi-statyczne i dynamiczne właściwości mechaniczne stopu tytanu Ti-6Al-4V otrzymanego niekonwencjonalnymi technologiami wytwórczymi
Autorzy:
Sarzyńska, Katarzyna J.
Paszkowski, Robert
Powiązania:
https://bibliotekanauki.pl/articles/2073833.pdf
Data publikacji:
2021
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
titanium alloys
split Hopkinson pressure bar
LENS
additive manufacturing
stopy tytanu
dzielony pręt Hopkinsona
wytwarzanie przyrostowe
Opis:
The purpose of this paper was to determine the mechanical properties of a Ti-6Al-4V titanium alloy produced by traditional CIP (Cold Isostatic Pressing) and by LENS (Laser Engineered Net Shaping), an additive manufacturing process. A reference material, being a commercial Ti-6Al-4V alloy, was also tested. The strength test specimens were produced from a high-quality, Grade 5 titanium powder. Each specimen had its density, porosity, and hardness determined. Compression curves were plotted for the tested materials from the strength test results with static and dynamic loads. These tests were performed on an UTS (Universal Testing Machine) and an SHPB (Split Hopkinson Pressure Bar) stand. The test results obtained led to the conclusion that the titanium alloy produced by CIP had lower strength performance parameters than its commercially-sourced counterpart. The LENS-produced specimens outperformed the commercially-sourced alloy both in static and dynamic load conditions.
Celem niniejszej pracy było wyznaczenie właściwości mechanicznych stopu tytanu Ti-6Al-4V wytworzonego metodą klasycznej metalurgii proszków CIP (ang. Cold Isostatic Pressing) oraz przy użyciu przyrostowej technologii wytwarzania LENS (ang. Laser Engineered Net Shaping). Badaniom poddano także komercyjny stop Ti-6Al-4V jako materiał referencyjny. Próbki do badań wytrzymałościowych przygotowano z wysokiej jakości proszku stopu tytanu gatunku 5. Dla wykonanych próbek materiałowych wyznaczono gęstość, porowatość, a także określono twardość. Ponadto, wyznaczono krzywe ściskania dla badanych materiałów na podstawie rezultatów testów wytrzymałościowych w warunkach statycznego i dynamicznego obciążenia. Wykorzystano do tego celu uniwersalną maszynę wytrzymałościową (UTS, ang. Universal Testing Machine) oraz stanowisko dzielonego pręta Hopkinsona (SHPB, ang. Split Hopkinson Pressure Bar). Na podstawie otrzymanych wyników badań stwierdzono, iż stop tytanu uzyskany metodą klasycznej metalurgii proszków charakteryzuje się niższymi parametrami wytrzymałościowymi od jego komercyjnego odpowiednika. Próbki wykonane technologią LENS cechują się wyższymi parametrami w porównaniu ze stopem komercyjnym zarówno w statycznych jak również dynamicznych warunkach obciążenia.
Źródło:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2021, 12, 4 (46); 69--82
2081-5891
Pojawia się w:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
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:
Assessment and Comparison of the Mechanical Properties of Laser Welded Joints in Docol 1200M and Strenx S700MC Steel Alloy Grades Under Impact Loads
Ocena i porównanie właściwości mechanicznych połączeń spawanych wiązką laserową stali Docol 1200M i Strenx S700MC w warunkach obciążenia udarowego
Autorzy:
Prochenka, Paweł
Janiszewski, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/403658.pdf
Data publikacji:
2020
Wydawca:
Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
Tematy:
laser welding
split Hopkinson pressure bar
high-strength steel
energy absorber
spawanie laserowe
stale wysokowytrzymałe
absorber energii udaru
technika dzielonego pręta Hopkinsona
Opis:
The article evaluates the strength and ductility of laser butt joints made of 2 mm Docol 1200 M martensitic steel sheets based on the hardness, quasi-static and dynamic tensile tests. Technological research of laser welding process was carried out on welding cell using IPG fiber – based welding source with 6 kW maximum power. The tests were carried out for parallel and perpendicular orientation of specimens by rolling direction. In addition, the obtained results were compared with the analogous results obtained during the Strenx S700 MC steel tests. Dynamic tests were performed using the tensile split Hopkinson pressure bar technique with strain rates of 103 s-1. The obtained results showed that the strength of Docol 1200 M under dynamic tensile test conditions are similar to the material strength under static tensile test conditions. However, due to the breaking of the specimens in the heat affected zone, the strength of the welded joint is much lower than in base material, which was not observed during the Strenx S700 MC steel tests.
W artykule dokonano oceny wytrzymałości i ciągliwości doczołowych złączy spawanych laserowo wykonanych z 2 mm blach z martenzytycznej stali Docol 1200 M na podstawie rozkładu twardości oraz wynikach quasi-statycznej i dynamicznej próby rozciągania. Badania technologiczne procesu spawania laserowego zostały przeprowadzone na stanowisku produkcyjnym wykorzystującym włóknowe źródło spawalnicze IPG o maksymalnej mocy 6 kW. Badania przeprowadzono dla próbek materiałowych zorientowanych równolegle i prostopadle względem kierunku walcowania stali. Ponadto, dokonano porównania otrzymanych wyników z analogicznymi rezultatami uzyskanymi podczas badań stali Strenx S700 MC. Badania dynamiczne wykonano za pomocą techniki dzielonego pręta Hopkinsona na rozciąganie z szybkościami odkształcenia rzędu 103 s-1. Uzyskane wyniki wykazały, że wytrzymałość stali Docol 1200 M w warunkach dynamicznego rozciągania jest zbliżona do wytrzymałości materiału w warunkach statycznej próby rozciągania. Jednakże ze względu na zrywanie próbek w strefie wpływu ciepła wytrzymałość połączenia spawanego jest zdecydowanie niższa w stosunku do materiału rodzimego, czego nie zaobserwowano podczas badań stali Strenx S700 MC.
Źródło:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2020, 11, 1 (39); 17-30
2081-5891
Pojawia się w:
Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strain measuring accuracy with splitting-beam laser extensometer technique at split Hopkinson compression bar experiment
Autorzy:
Panowicz, R.
Janiszewski, J.
Traczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/201778.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
SHPB test
strain rate
non-contact strain measurement
laser extensometer
test SHPB
szybkość odkształcenia
bezdotykowy pomiar odkształcenia
laserowy ekstensometr
Opis:
An accuracy problem of strain measurement at compression split Hopkinson compression bar experiments with a splitting-beam laser extensometer was considered. The splitting-beam laser extensometer technique was developed by Nie et al. to measure strain of a specimen during its tension under a high strain rate loading condition. This novel concept was an inspiration for the authors to develop own laser extensometer system, which allows for simultaneous and independent measurement of displacement of bar ends between which a compressed material specimen is placed. In order to assess a metrological property of this measuring system, a wide range of high strain rate experiments were performed, including tests with various sample materials (Al 5251, Cu OFE) with different rate of strain, and with the use of two bars material. A high accuracy of the developed laser extensometer was found in measurement of specimen strain, for which uncertainty is not greater than 0.1% and, for a typical specimen dimension, the maximum permissible error is 4.5 μm.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 2; 163-169
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
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:
The influence of non-axisymmetric pulse shaper position on SHPB experimental data
Autorzy:
Panowicz, R.
Janiszewski, J.
Kochanowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/280350.pdf
Data publikacji:
2018
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
split Hopkinson pressure bar
pulse shaping technology
high-strain-rate testing
Opis:
The results of experimental and numerical analysis of the influence of the non-axisymmetric pulse shaper position on recorded wave signals in the split Hopkinson pressure bar experiment are presented. The paper focuses attention on the problem of wave signal disturbances caused by a bending wave resulting from non-axisymmetric pulse shaper positions and, moreover, different shaper thickness, striker impact velocities and Wheatstone bridge configurations. The obtained results of analyses indicate that the effect of the non-axisymmetric pulse shaper position may be neglected if deviation from the bar axis does not exceed 20%.
Źródło:
Journal of Theoretical and Applied Mechanics; 2018, 56, 3; 873-886
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the Strain Rate Sensitivity of Fibre-Reinforced Self-Compacting Concrete
Autorzy:
Pająk, Małgorzata
Janiszewski, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/38888160.pdf
Data publikacji:
2022
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
split Hopkinson pressure bar
recycled steel fibres
self-compacting concrete
Opis:
This study investigates the characteristics of self-compacting concrete (SCC) reinforced with recycled fibres and their combination with polypropylene fibres, which can be applied to build protective structures. The split Hopkinson pressure bar (SHPB) method was used to subject the mixtures to high strain rates in the range from 140 to 200 s−1, corresponding to impact loads. It was found that the strain rate sensitivity of both types of mixtures was comparable. The failure pattern confirmed the role of fibres in carrying the loads for strain rates below around 100 s−1.
Źródło:
Engineering Transactions; 2022, 70, 3; 203-220
0867-888X
Pojawia się w:
Engineering Transactions
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:
Analysis of the impact of the frequency range of the tensometer bridge and projectile geometry on the results of measurements by the split Hopkinson pressure bar method
Autorzy:
Moćko, W.
Powiązania:
https://bibliotekanauki.pl/articles/220701.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Hopkinson bar
tensometer bridge
amplifier bandwidth
strain measurement
Opis:
The paper presents the results of the analysis of the striker shape impact on the shape of the mechanical elastic wave generated in the Hopkinson bar. The influence of the tensometer amplifier bandwidth on the stress-strain characteristics obtained in this method was analyzed too. For the purposes of analyzing under the computing environment ABAQUS / Explicit the test bench model was created, and then the analysis of the process of dynamic deformation of the specimen with specific mechanical parameters was carried out. Based on those tests, it was found that the geometry of the end of the striker has an effect on the form of the loading wave and the spectral width of the signal of that wave. Reduction of the striker end diameter reduces unwanted oscillations, however, adversely affects the time of strain rate stabilization. It was determined for the assumed test bench configuration that a tensometric measurement system with a bandwidth equal to 50 kHz is sufficient.
Źródło:
Metrology and Measurement Systems; 2013, 20, 4; 555-564
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 28

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