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Skocz do pozycji: 1.

Tytuł:: Experimental investigation of selected explosion parameters for numerical model
Autorzy:: Barnat, W.
Gieleta, R.
Niezgoda, T.
Powiązania:: https://bibliotekanauki.pl/articles/241757.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: IED
improvised explosive device
numerical model
validation
Opis:: The aim of presented work is examination of blast wave, especially incident and reflected wave pressure. Due to many difficulties and complexity of phenomenon a complete study for different charges should be done. In presented paper two cylindrical TNT charges were used, weighting respectively 100 g and 200 g. Pressure wave was examined using original test stand designed and developed on Department of Mechanics and Applied Computer Science. A test steel test plate with 5 mm thickness was equipped with pressure gauge to measure reflected wave. Additionally, the plate was placed on four special electroresistance strain gauges...To measure force Vishay EA-06-120-060LZ strain gauges were used. For amplification of the dynamometers with strain gauges, MS1001 INFEL bridge was used. The system was used to validate the results from reflected wave pressure gauge. Shock wave pressures was measured using a special sensor model 137A21 amd M350B21 made by PCB Piezotronics At specific distance there was also incident wave pressure gauge. In order to fully examine the dynamic response of the plate an accelerometer was used. As a result, pressure versus time and acceleration versus time plots were obtained. The results will be used to validate numerical model of blast wave impact on a plate.
Źródło:: Journal of KONES; 2012, 19, 4; 9-13
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Experimental investigation of deflectors angle influence on energy absorption
Autorzy:: Gieleta, R.
Barnat, W.
Niezgoda, T.
Powiązania:: https://bibliotekanauki.pl/articles/241835.pdf
Data publikacji:: 2012
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: IED
improvised explosive device
hull resistance
deflector
Opis:: Numerical simulations without preliminary validation and model verification are vulnerable to errors. Best results are obtained when full experimental research is provided. Such tests are expensive and may be dangerous. Due to cost control and personnel safety, studies are often done in scale. Scale can affect both construction dimensions and applied load. In this paper four different vehicle's bottoms are examined: flat bottom and 3 types of deflectors. The paper presents four different vehicle's bottom shapes in order to examine deflector angle influence on energy absorption. The test included 4 cases: flat bottom broken-shaped deflector and deflectors with different apex angles 124 centigrade and 144 centigrade. For all cases the distance between explosive and panel was approximately 400 mm. The charge used was 100 g TNT. Flat bottom and deflectors were made of St3 steel with 2 mm thickness. For the purpose of the research a special test stand to examine effects of detonation wave was used. The force measurement system was designed in Department of Mechanics and Applied Computer Science. As a result, force versus time plots were obtained. The use of any deflector decreases maximum force affecting vehicle's hull.
Źródło:: Journal of KONES; 2012, 19, 4; 201-205
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Numerical and experimental research on the impact of the Twaron T750 fabric layer number on the stab resistance of a body armour package
Numeryczno doświadczalne badanie wpływu ilości warstwy Twaron T750 na nożoodporność kamizelek ochronnych
Autorzy:: Sokołowski, D.
Barnat, W.
Powiązania:: https://bibliotekanauki.pl/articles/234401.pdf
Data publikacji:: 2016
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
Tematy:: stab resistance
body armour
twaron fabric package
numerical model
experimental test
kamizelki kuloodporne
Twaron T750
model numeryczny
badanie eksperymentalne
Opis:: The aim of the paper was to research how the depth of penetration in dependence on the fabric layer number used in the ballistic package is changed. During the research, the following methodology was adopted: the object of study was Twaron T750 fabric, specially dedicated for use in bulletproof vests. Then a numerical model consisting of 35 layers of fabric was established, from which the following parameters were selected for registration: depth of the knife’s penetration, displacement, velocity and acceleration. Then experimental studies were carried out which reflected the numerical model. In the next step a numerical model was validated and variants for the number of layers included in the package were created. The computing environment was commercial software LS-Dyna. Experimental studies were recorded using a super-high-speed camera - PhantomV12. The studies were conducted on the basis of the NIJ Standard -0115.00 norm.
Celem niniejszego artykułu jest zagadnienie wpływu ilości warstw tkaniny ar amidowej Twaron T750 na wartość penetracji energii kinetycznej w teście nożoodporności. Zagadnienie nożoodporności jest zjawiskiem złożonym, na które posiada wpływ wiele elementów. Jednym z nich jest zagadnienie ilości warstwy tkaniny, z której jest wykonany wkład ochronny. Ilość warstw tkaniny znajdującej się w pakiecie ochronnym jest wykonany wkład ochronny. Ilość warstw tkaniny znajdującej się w pakiecie ochronnym jest wartością, która w znaczący sposób wpływa na masę powierzchniową pakietu ochronnego. Z tego powodu precyzyjne określenie ilości warstw pakietu jest najistotniejszym elementem badań. Dokładne zbadanie zależności pomiędzy ilością warstw, a wartością penetracji oraz energii kinetycznej jest ważne dlatego, ponieważ posiadając taką wiedzę, można dokładnie dobrać odpowiednie parametry, by zapewnić wkładowi jak największą skuteczność ochrony.
Źródło:: Fibres & Textiles in Eastern Europe; 2016, 1 (115); 78-82
1230-3666
2300-7354
Pojawia się w:: Fibres & Textiles in Eastern Europe
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Numerical simulation of blast resistant steel plate strengthened with composite
Autorzy:: Kosiuczenko, K.
Niezgoda, T.
Barnat, W.
Panowicz, R.
Powiązania:: https://bibliotekanauki.pl/articles/245529.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: blast
composite
FEM
ply
simulation
Opis:: The paper presents the process of enhancing blast resistance of a thin steel plate by reinforcing it by a composite. The composite consisted of five differently orientated layers of high resistant S2/Glass fabric. Such system was subjected to a pressure wave generated by detonation of small TNT charge placed at a certain distance from the plate. Reinforcing the plate with composite layer improved the ballistic and blast wave protection level of the shield. Due to the usage of the composite the overall mass of the entire plate raised only slightly. Proposed solution can be used to improve the characteristics of existing armours by adding extra panels or modifying armours of transport vehicles. For the purpose of the numerical analysis, the Finite Element Method and explicit time integration were used. Calculations were done using LS-Dyna software. Numerical solutions of both steel plate and steel plate with composite are presented and evaluated. Pressure wave of the blast impulse, the physical model of the blast test, Structure of the four composite layer, deformation shape of steel-composite plate (pressure wave in Z-direction, t=1 ms), failure of plies, Huber-Mises-Hencky stress as material effort on plate are presented in the paper.
Źródło:: Journal of KONES; 2011, 18, 3; 155-160
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Composite-polymer materials for energy-absorbing structures
Autorzy:: Barnat, W.
Niezgoda, T.
Ochelski, S.
Powiązania:: https://bibliotekanauki.pl/articles/246205.pdf
Data publikacji:: 2009
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: energy absorption structures
safety
composites
numerical simulation
energy absorption investigations
Opis:: On the basis of the results obtained from our own experimental investigations of energy- absorbing elements, the influence of the given factors on absorbed energy (WEA) was determined. The objects of the research were the samples made of epoxy composites reinforced with glass fibres formed in roving, roving stripes and glass mat as well as with carbon fibres formed in roving and carbon roving stripes. To investigate the capability of hitting energy absorption of the samples in the shape of tubes, the truncate cones and in the shape of a thin cuboid were taken under consideration. The sample in the shape of tubes, wavy coats and thin cuboids with angle 45° (on one edge), play the role of the initiator of progressive destruction process. The composites matrix was taken into account during investigations: epoxy, the vinyl-esters, polyetheretherketones, reinforced with carbon and glass fibres with different structures of the samples. The influence of the sample geometry and the orientation of the layers in carbon / epoxide and the ar amid / the epoxide composites on the WEA absorption value were presented in the papers. The comparison of the structures made f rom single elements with relevant structures of four elements shows that absorbed energy is accumulating. In this case the relative absorbed energy remains at the similar level.
Źródło:: Journal of KONES; 2009, 16, 1; 21-34
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Investigations of composite energy absorbing elements
Autorzy:: Niezgoda, T.
Barnat, W.
Kiczko, A.
Powiązania:: https://bibliotekanauki.pl/articles/243633.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: impact test
FEM simulation
passive safety
composite structure
energy absorbing materials
Opis:: In this work the problem connected with an improvement of the road safety through implementation of additional elements absorbing the hitting energy is taken into consideration. The experimental results of a basic absorbing element of the glass epoxy composite are presented. The results of these tests will serve for the construction of a reliable numerical model of a panel of protective elements. The coincidence between the experimental and numerical results is also proved, showing that introduced approach to the modelling of the process of the progressive destruction and the energy absorption by composite elements is not only properly assumed but is very promising for the future. Efforts, which lead to increase the amount of absorbed energy need actions, directed to improving absorbing energy properties of used elements. Therefore, the received results will serve as guidelines for elaboration the methodology of the research structures of that type and also could be used in further research works within the scope of increasing the road security. In the article it is also proved that there is the necessity to conduct the series of comparative experiments and also tests verifying numerical studies at loading speeds, which can be compared with ones in reality, e.g. crash test or shock wave of an explosion. The validated, in such way, method of numerical simulations enables the limitation of costly and long-lasting research of real objects.
Źródło:: Journal of KONES; 2008, 15, 3; 405-409
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Numerical analysis of progressive failure of composite energy absorbing structures
Autorzy:: Niezgoda, T.
Barnat, W.
Powiązania:: https://bibliotekanauki.pl/articles/243301.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: transport safety
road barriers
numerical analysis
energy-absorbing element
FEM
Opis:: The aim of the paper was to compare the influence of the applied fill on the energy absorbed by the energy ubsorbing structural elements made of composite, steel and from composite with fill foam. The experimental tests were carried out on an INSTRON universal testing machine at the speed rate of the machine's traverse equal 10 mm/min md the numerical analysis has been performed using MSC. Dytran software based on the Finite Element Method. The elements were subjected to axial kinematic loads. The higher specific absorbed energy occurs in the case of energy absorbing elements made of composites and from composite with fill foam. These elements can be applied in structures designed for the protection of people or limitation of the whole structure failure, e.g. in the case of a helicopter or car crash etc. The failure progressing in a relatively uniform manner results in the fact that the work md for failure of an energy absorbing element causes a substantial reduction of the impact load results. Application of energy absorbing elements may be a system dissipating the energy of a car impact into a crash barrier. The results of numerical simulation of stiffness plate hitting to the road barrier are presented. Experimental tests and numerical simulations were also presented for a composite sleeve subjected to progressive failure, which allowed carrying out simulation and analysis of a crash into a road barrier protected by a system of two such sleeves.
Źródło:: Journal of KONES; 2008, 15, 1; 169-181
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Analysis of a light caterpillar vehicle loaded with blast wave from detonated IED
Autorzy:: Barnat, W.
Niezgoda, T.
Panowicz, R.
Powiązania:: https://bibliotekanauki.pl/articles/247638.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: IED
vehicle shell
FE analysis
ground
Opis:: More and more impudent attacks on the military convoys in Afghanistan proved a huge danger of the improvised explosive devices - IED. Huger and more clever charges are a serious problem for vehicles protection. Additionally, hitherto defence standards and STANAG didn't predict such huge charges. Majority investigations were based on a 3 kg anti-tank mine. The article presents the results of numerical calculations for the elements of the combat vehicle supporting structure loaded with an impact generated by explosion of a huge explosive charge under the bottom of the vehicle with consideration of the wave reflected from the ground. Such an approach allows obtaining a good approximation of numerical simulations to real conditions of terroristic attacks. Additionally, the analysis of IED side influence on the vehicle shell was conducted. The explosive charge — IED — was simulated with the use of concentrated energy of properly selected (on the base of literature investigations) density and initial energy. During analyses of side explosive on the vehicle structure, the obstacle in the form of a building increasing the pressure impulse was taken into account. The paper presents the results of a numerical analysis in which Euler and Lagrange domains(describing a vehicle) were coupled. A perfect gas model was used to describe air parameters.. Additionally, the ground was described with a gas model. Every kind of material data were selected on the base of experimental investigations. A bilinear material model with a Cowper and Symonds strain rate model was used to describe a vehicle. Such an approach fully describes the phenomena occurring in the system.
Źródło:: Journal of KONES; 2010, 17, 4; 27-34
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Pianki poliuretanowe - właściwości, zastosowania, recykling
Poliurethane foams - properties, applications, recycling
Autorzy:: Barnat, W.
Miedzińska, D.
Niezgoda, T.
Powiązania:: https://bibliotekanauki.pl/articles/357306.pdf
Data publikacji:: 2011
Wydawca:: Politechnika Śląska
Tematy:: pianka poliuretanowa
tworzywa sztuczne
recykling
pouliurethane foam
polymers
recycling
Opis:: Pianka poliuretanowa jest tworzywem sztucznym składającym się z komórek litego poliuretanu, który otacza pęcherzyki gazu. Materiał ten może być sztywny lub podatny na odkształcenia, ale zawsze charakteryzuje się niską gęstością. Pianki najczęściej są produkowane w formie dużych bloków, które ucina się do pożądanych kształtów. Po zakończeniu okresu użytkowania poliuretany mogą być odzyskiwane w celu ponownego użycia lub poddawane recyklingowi chemicznemu. W artykule przedstawione zostały wybrane problemy związane z badaniem, zastosowaniem i w dalszej kolejności recyklingiem pian polimerowych.
Polyurethane foam refers to a number of different types of foam consisting of polymers made of molecular chains bound together by urethane links. It can be flexible or rigid, but has a low density. Flexible polyurethane is made in blocks and then cut to its desired shape. At the end of their service life, polyurethanes can be sent for reuse (for example, rebonding) or chemical recycling, or can be incinerated for energy recovery. The chosen problems connected with research, implementations and recycling of polyurethane foams were presented.
Źródło:: Archiwum Gospodarki Odpadami i Ochrony Środowiska; 2011, 13, 4; 13-17
1733-4381
Pojawia się w:: Archiwum Gospodarki Odpadami i Ochrony Środowiska
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Walidacja pian niemetalicznych w złożonym stanie odkształcenia
The validations of constitutive models for non metallic foam under complex strain state
Autorzy:: Barnat, W.
Dziewulski, P.
Niezgoda, T.
Powiązania:: https://bibliotekanauki.pl/articles/387115.pdf
Data publikacji:: 2009
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:: walidacja
piana niemetaliczna
validations
non-metallic foam
Opis:: W niniejszym artykule przedstawiono wyniki badań energochłonności piany niemetalicznej obciążonej przemieszczeniem. Głównym celem pracy była walidacja modelu numerycznego spienionego polichlorku winylu wraz z oceną zdolności pochłaniania energii przez podstawowy element konstrukcji energochłonnej obciążonej dynamicznie. Elementy energochłonne przebadano w KMiIS. Badania przeprowadzono na maszynie wytrzymałościowej Instron. Obciążenie realizowano przez wymuszenie kinematyczne.
In the present article, the results of investigations of energy absorption foam structures weighted down were presented. The main objective of this study was the validations of constitutive models for non metallic foam. Investigations were conducted on Dynamic Testing System INSTRON in KMiIS. The load was applied by input function kinematic.
Źródło:: Acta Mechanica et Automatica; 2009, 3, 3; 5-8
1898-4088
2300-5319
Pojawia się w:: Acta Mechanica et Automatica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Numerical analysis of the influence of blast wave on human body
Autorzy:: Sławiński, G.
Niezgoda, T.
Barnat, W.
Wojtkowski, M
Powiązania:: https://bibliotekanauki.pl/articles/244503.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: improvised explosive devices
blast wave
survivability
numerical study
Opis:: Threats for military personnel during combat missions nowadays are of different sources. Further development of methods for neutralization of mines or improvised explosive devices (IED) explosions must be preceded by identification of the impact phenomenon on crew of the military vehicle. Large accelerations cause injury to a person located in the interior of the vehicle and may lead to permanent disability exempting soldiers from the battlefield. Information about overload coming from the explosion of IEDs on humans are difficult to access or not sufficiently detailed. Therefore, the basis for their acquisition is conducting experimental research and modelling. The paper is presents finite element analysis of blast wave effects on a human body simulated by a numerical 50th percentile HYBRID III dummy. Coupled Euler and Lagrange (ALE) formulations are used in the finite element analysis of such problems to accurately represent the detonation phenomenon. Numerical model was developed in LS-PrePost software. All the computational analyses were carried out using an explicit LS-DYNA solver on multiprocessor cluster. Data such as hip and knee moment of inertia, femoral force, and foot acceleration are collected from the numerical dummy, which simulates the occupant’s response. These data are then compared to injury threshold values from various references to assess survivability
Źródło:: Journal of KONES; 2013, 20, 3; 381-386
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Numerical analysis of ceramic-steel-composite shield subjected to ballistic impact of the fragment
Autorzy:: Kosiuczenko, K.
Niezgoda, T.
Barnat, W.
Panowicz, R.
Powiązania:: https://bibliotekanauki.pl/articles/244582.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: ballistics
ceramics
composite
fragment
multilayer
simulation
Opis:: The issue of missile impact resistance is discussed in detail in many articles and standard papers dealing with body armour. The experience from many armed conflicts, however, may be proof that the real risks are related to a greater degree to fragments than those of bullets. It can be shown that the more often the object is destroyed as a result high-velocity impact of fragments. The paper describes the results of numerical simulations of 22 calibre bullet shrapnel piercing multilayer ballistic shield. The shield was made of ceramics, steel and composite materials. The shape of the fragment is based on the American the defence standard MIL-DTL-46593B. The fragment tested is made through the process of cold rolling steel 4337H or 4340H characterized by hardness of about 30 units on the Rockwell scale. The mass of the fragment is 17 grains (1.14 g). The ballistic shield, that was hit by fragmentation, was a rectangular plate made of a Kevlar composite and, in another variant, an epoxy composite. The test was conducted in accordance with the terms of ballistic fragmentation resistance test V50 contained in standard MIL-STD-662F. In undertaking the simulation was used the Finite Element Method (FEM) which is implemented in LS-Dyna programme. The numerical calculations were performed in the explicit option on a multiprocessor computational cluster. The necessary information to build a model like materials’ properties is taken from extensive literature. The numerical simulation resulted in, inter alia, maps and diagrams of stress, strain and energy, which were treated to further detailed analysis. On this basis of an evaluation was carried out and correction made to the FEA model. The resulting model has enabled an observation of the penetration of the ballistic shield and the ballistic behaviour of the fragment when it contacts with obstacle. These observations are essential in the design of modern protective structures and undertaking research without incurring excessive financial costs generated by laboratory experiments.
Źródło:: Journal of KONES; 2011, 18, 1; 295-300
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Influence of armoured vehicles bottom shape on the pressure impulse
Autorzy:: Barnat, W.
Panowicz, R.
Niezgoda, T.
Powiązania:: https://bibliotekanauki.pl/articles/243701.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: IED
improvised explosive device
mine resistance
armour
deflector
hull design
light armoured vehicle
Opis:: This paper presents the results of a numerical analysis of military vehicles hulls mine resistance. The research concerns armours loaded with blast wave from large IED charges in three cases. First is an explosion in Euler domain without any boundary conditions. Second consists of Euler domain with flat bottom and the ground. Third is simulated Euler domain with ground and deflector. Boundary conditions used both in second and third case resulted in growth of the pressure impulse due to the reflection from a rigid obstacle. In the article different hull bottom shapes are compared. The gap between the bottom and the ground is fixed in all cases. Explosion in Euler domain without limitations is added as a reference. The blast wave caused by the detonation (simulated as a point detonation) propagated in cubic mesh with appropriate boundary conditions. Theoretical solution of spherical non-linearity is given in a form of Taylor equations. It was used to verify the numerical model. The research showed that the ground proximity affects the results of the simulation. The pressure impulse is amplified due to the wave reflection from both the bottom of the vehicle and the ground. As well as that, the study confirmed that the usage of the deflector considerably reduces the impact load to the structure.
Źródło:: Journal of KONES; 2011, 18, 1; 39-46
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Numerical analysis of initial and boundary conditions influence on the crew of tracked vehicle and the ground
Autorzy:: Barnat, W.
Panowicz, R.
Niezgoda, T.
Dybcio, P.
Powiązania:: https://bibliotekanauki.pl/articles/243703.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: hull design
tracked vehicle
Opis:: The problem of vehicle's impact resistance is broadly discussed in many articles and standardizations concerning special structures. In this paper, the numerical analysis results of an armoured vehicle loaded with blast wave are presented. Effects of ground proximity such as wave reflection are also taken into account. What is more, the tracking system was also included in calculations. The ground was modelled using Mie-Grüneisen equation of state. In the research an ALE coupling algorithm was used to model interaction between fluid (Euler domain) and structure (Lagrange domain). Euler description is used for air and blast wave propagation modelling, whereas structure is described by Lagrange equations of mass, momentum and energy conservation. The ALE coupling algorithm is implemented in MSC Dytran software. The problem was solved using explicit integration of movement equations over time. The research showed that ground and wheels considerably affect the simulation results. The pressure impulse on the vehicle's bottom increased by 40 per cent compared to the model in which these effects were not considered. Furthermore, the quality of the results increased as the solution obtained is more physical. Proposed method is a useful tool in hull design process. As well as that, the method will be further developed to include more detailed model of the vehicle.
Źródło:: Journal of KONES; 2011, 18, 1; 31-38
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Investigation of road barriers on their abilities to absorb energy of hitting
Autorzy:: Niezgoda, T.
Kiczko, A.
Barnat, W.
Dziewulski, P.
Powiązania:: https://bibliotekanauki.pl/articles/244885.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: numerical simulations
validation
road transport
road barriers
passive safety
Opis:: In the article, the results of tests and numerical computations of road infrastructure elements-protective barriers are presented. On the base of carried out tests (in laboratory conditions) the forms of deformations of each of elements and their assemblies, components of road protective barriers, were described. The determination of stiffness of each type of barriers, at the moment of their destruction, enabled to elaborate the methodology of the construction of numerical models and numerical simulations of the process of the barrier destruction. The absorption of energy of three subassemblies of road barriers, consisting of the W-beam guard rail section of 0.7 m, a post and SP01, SP05 and SP09 mounting hardware, was experimentally determined. From the comparison, the experimental results with the numerical simulation ones it is seen that proposed numerical models with a good accuracy present the behaviour of the real elements of barriers. Investigations enabled to estimate the distribution of absorbed energy of each constructional elements of barriers at the moment of their destruction. Further step in the investigation is to be an attempt to modify the construction, paying special attention to increasing its ability to absorb energy of collision. On this base, the protective road barrier system can be enriched with elements absorbing energy. Great energy absorbing abilities have elements which are subjected to progressive destruction e.g. by plastic deformation or delamination of elements produced from relatively cheap fiberglass reinforced plastic composites. The elaborated methodology of numerical simulation with the use of LS-DYNA software enables the essential shortening of the test period of worked out solutions.
Źródło:: Journal of KONES; 2008, 15, 4; 383-391
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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