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Dotychczasowe badania i rozwój skuteczności włókienniczych barier balistycznych opierają się przede wszystkim na doskonaleniu własności wytrzymałościowych surowca użytego do ich budowy. Używane powszechnie płaskie bariery włókiennicze są to tkaniny, w których struktura geometryczna może odgrywać istotną rolę w wytrzymałości balistycznej zbudowanego z nich wyrobu. W zależności od struktury geometrycznej tkaniny, zdefiniowanej tzw. splotowymi modułami strukturalnymi, badano prędkość propagacji fali naprężeń w tkaninie przyjmując hipotezę, że ma ona wpływ na sposób i ilość pochłanianej energii kinetycznej lecącego pocisku podczas uderzenia. Zaproponowano oryginalną metodę pomiarową, dla której sformułowano równanie przetwarzania analizując zjawiska z dziedziny optyki i optoelektroniki. Stwierdzono, że w tkaninach prędkość propagacji fali naprężeń jest 2 do 5 razy mniejsza w stosunku do prędkości propagacji fali w nitce zastosowanej do jej wykonania. Istotną rolę odgrywa tutaj efekt przeplatania się nitek wątku i osnowy. Na tej podstawie zaproponowano zastosowanie struktur nieprzeplatanych o splotowym module strukturalnym typu SMS 4 do zastosowania jako warstwy w pakietach balistycznych. Opracowano stanowisko do formowania struktur arkuszowych o splotowym module strukturalnym typu SMS 4, a do ich realizacji zastosowano przędzę aramidową Twaron CT Microfilament 930 dtex. W dalszej kolejności, pakiety przeciwuderzeniowe złożone z arkuszy o strukturze typu SMS 4 poddano testom balistycznym w Laboratorium Badań Balistycznych powstałym w Katedrze Automatyzacji Procesów Włókienniczych Politechniki Łódzkiej w ramach realizacji badań w celu oceny ich własności. Zaprojektowano i wykonano tunel balistyczny do badań własności balistycznych pakietów przeciw-uderzeniowych zawierający: działo balistyczne do wystrzeliwania pocisków, system bramek do pomiaru prędkości uderzenia i prędkości resztkowej pocisku, systemy mocowania pakietu balistycznego. Dodatkowo w ramach realizacji badań zaprojektowano i wykonano kamerę do szybkiej rejestracji stożka odkształcenia pakietu balistycznego podczas uderzenia pocisku w czasie rzeczywistym. Metoda pomiarowa nie bazuje na rejestracji ciągu obrazów, lecz na ciągłym numerycznym zapisie wielkości przemieszczenia wybranej tworzącej stożka odkształcenia w stosunku do początkowej płaszczyzny próbki. Zobrazowanie stożka odkształcenia dokonuje się w procesie rekonstrukcji poprzez zastosowanie algorytmów aproksymujących, bazujących na sztucznych sieciach neuronowych. Weryfikację balistyczną opracowanych pakietów balistycznych, przeprowadzono w trzech wariantach, stosując w warstwach uzyskane arkusze o strukturze typu SMS 4 oraz w celu porównania, tkaninę o strukturze typu SMS l wykonaną w splocie płóciennym. Obie struktury zostały wykonane z tej samej przędzy aramidowej typu Twaron CT Microfilament 930dtex/flOOO. Zachowano porównywalny poziom liczności nitek dla obu kierunków pasm w strukturze typu SMS 4 oraz wątku i osnowy w tkaninie tak, aby masy powierzchniowe obu tych struktur były na zbliżonym poziomie. Poszczególne warianty złożone były z następujących warstw: - Wariant l - pakiety balistyczne złożone z warstw typu SMS 4, - Wariant 2 - pakiety balistyczne złożone z warstw typu SMS l, - Wariant 3 - pakiety balistyczne złożone naprzemian z warstw typu SMS 1 i SMS 4. W każdym wariancie próbki pakietów złożone były z następującej liczby warstw: 6, 8, 10, 12, 16, 24. Dla tak przygotowanych pakietów balistycznych, wykonano badania stożka odkształcenia i ilości pochłanianej energii kinetycznej pocisku w Laboratorium Badań Balistycznych. W badaniach zastosowano pociski typu Parabellum FMJ 9x19 mm o prędkości uderzeniowej (360110) m/s. Na podstawie wyników pomiarów opracowano charakterystyki absorbowanej energii oraz maksymalnej deformacji w funkcji masy powierzchniowej i określono granice bezpieczeństwa wynikające z I i II kryterium bezpieczeństwa pakietów balistycznych. Dodatkowo za pomocą kamery do szybkiej rejestracji analizowano rozwój stożka odkształcenia w czasie rzeczywistym. Analizując granice bezpieczeństwa wynikające z nieprzestrzelenia oraz maksymalnej wysokości stożka odkształcenia poniżej 44 mm dowiedziono, że dla pakietów balistycznych wykonanych ze struktur nieprzeplatanych SMS 4 jednoczesne spełnienie obu kryteriów podczas ostrzału pociskami występuje przy znacząco mniejszej masie powierzchniowej w stosunku do pakietów balistycznych wykonanych z tkanin o splocie płóciennym (moduł SMS 1). Tym samym zweryfikowano pozytywnie hipotezę o związku pomiędzy prędkością propagacji fali naprężeń a efektywnością balistyczną pakietów przeciwuderzeniowych. Mając na uwadze minimalizację udaru balistycznego na ciało człowieka podczas niepenetrującego uderzenia pocisku, analizowano również obszar niezerowego ciśnienia oraz prędkość deformacji pakietu balistycznego. Stwierdzono, że w chwili zatrzymania pocisku dla pakietu balistycznego typu SMS 4 obszar niezerowego ciśnienia jest dla danej liczby warstw najmniejszy w stosunku do wartości tego parametru w pozostałych badanych pakietach przy równocześnie najmniejszej wysokości stożka odkształcenia. Również maksymalna prędkość deformacji pakietu w punkcie uderzenia pocisku jest najmniejsza w pakietach typu SMS 4 przy porównywalnej masie powierzchniowej pakietów.
Up till now research on flat textile ballistic barriers and improving their effectiveness was mainly based on improving strenght of raw material used for their production. However, the commonly used flat textile barriers are woven fabrics, in case of which geometrical structure may play an important role in the ballistic resistance of the product built of them. Depending on the geometrical structure of the woven fabric, defined by the so-called weave structural modules, the velocity of propagation of the tension wave was tested, as it was assumed that it can influence the amount of kinetic energy of the bullet absorbed during the stroke and the way of absorption. An original measuring method was proposed, for which a conversion equation was formed, analyzing optical and optoelectronic phenomena. Taking into account research results of velocity of propagation of the tension wave and fabric classification with a module model it was found out that two optimum fabric structures for ballistic barriers can be distinguished: - for fabrics characterized with unstable structure the ballistic barrier should take the for of a packet consisting of non-interlaced structures of the weave structural module of the type SMS 4, - for fabrics characterized with stable structure the ballistic barrier should take the for of a packet consisting of fabrics of the weave structural module of the type SMS 1 (plain weave), with maximum density of warp and weft threads. On that basis, a stand for forming sheet structures of the weave structural module of the type SMS 4 was constructed. Taking into account the investigation into the influence of the weave structural modules of the fabric on the velocity of propagation of the tension wave, such a structure should be characterized with maximum propagation velocity of the tension wave for the chosen raw material and density of threads in individual warps. Then, in the Laboratory of Ballistic Research established at the Department for Automation of Textile Processes of the Technical University of Lodz the ballistic packets consisting of sheets of the SMS 4 structure underwent ballistic tests, which helped to evaluate their ballistic properties. For that purpose a ballistic tunnel was designed and constructed for testing properties of ballistic packets, which may potentially be applied in bullet-proof vests. The properties of the ballistic tunnel: - the ballistic gun may shoot bullets which refer to testing ballistic packets in bullet-proof class II, Ha, III i Ilia, - a system of gates was installed within the tunnel for measuring the impact velocity and the residual velocity of the bullet, - the ballistic tunnel fulfills the safety criteria determined in the Act on Weapons and Ammunition, - a required permission for the ballistic tests was obtained from the Lodz Police Station. The research concerning ballistic verification of developed packets was devoted to testing the absorbed amount of kinetic energy of the bullet and forming the deformation cone during the stroke in real time. A novel, three-dimensional registering of the deformation of the ballistic packet during the stroke in real time was proposed. The measuring method is not based on registering a series of images but on a continuous numerical recording of the displacement of the selected element of the deformation cone in relation to the initial plane of the sample. Reconstruction of the deformation cone is performed by using approximation algorithms based on artificial neural networks. Three variants of the ballistic verification of the ballistic packets were carried out using: - sheets of the SMS 4 structure, - sheets of the SMS 1 structure. Both structures were made of para-aramid yarns of third generation of the type Twaron CT Microfilament 930 dtex/f 1000. A comparable density of threads for both warps in the SMS 4 structure and the density of warp and weft in the woven fabric were kept, so that the area densities of both structures remained similar. The tested variants consisted of the following layers: - Variant 1 - ballistic packets consisting of layers of the SMS 4 type, - Variant 2 - ballistic packets consisting of layers of the SMS 1 type, - Variant 3 - ballistic packets consisting alternately of layers of the SMS 1 and SMS 4 type. In each variant the sample packets consisted of 6, 8, 10, 12, 16 and 24 layers. After the ballistic packets were prepared as described above, tests were made of the deformation cone and absorbed kinetic energy of the bullet at the Laboratory of Ballistic Research. In the tests Parabellum FMJ 9x19 mm bullets of the impact speed (360+10) m/s were used. On the basis of the measurements results ballistic characteristics of the packets were determined, establishing security limits resulting from the I and II safety criterion of ballistic packets. Analyzing the security limit according to criterion I for packets of the type SMS 4, SMS 1 and SMS 1- SMA 4 it has been discovered that all types of the packets can be used for ballistic barriers. Packet SMS 1, for which the security limit is ten layers, possesses the best properties. For the remaining two types of packets the security limit is determined by packets consisting of 12 layers. Analyzing the security limit according to safety criterion II it was found out that only packets of the structure SMS 4 and SMS 1-SMS 4 fulfill the criterion for the adopted measuring conditions and boundary conditions. Ballistic packets containing layers of maximum propagation velocity of the tension wave of the SMS 4 type posses the minimum level of the maximum heights of the deformation cone in the function of the number of layers. Thus, analyzing the security limits resulting from not shooting through and maximum height of the deformation cone below 44 mm it was proven, that for ballistic packets made of non-interlaced structures SMS 4 it is possible to simultaneously fulfill both criteria during the fire by much smaller area density, comparing to ballistic packets made of fabrics with plain weave (module SMS 1). Thus, the hypothesis concerning connection between the propagation velocity of the tension wave and ballistic efficiency of the developed packets was positively verified. Apart from the maximum cavity resulting from the height of the cone in the point where the bullet strikes, another issue which is important from the point of view of the possible injuries one can suffer as a result of a non-penetrating stroke is the interaction range of the non-zero pressure on the affected object and the maximum deformation speed. Because of the elastic properties of different parts of human body, the tensions that occur inside it during a non-penetrating stroke depend not only on the depth of the deformation but also on the deformation speed. It was found out that at the moment the bullet is stopped by the ballistic packet SMS 4 the non-zero pressure zone is for the given number of layers the smallest of all the tested types of packets. Similarly, the analysis of the maximum deformation velocity has shown that in SMS 4 packets the maximum deformation speeds are the smallest. It has to be taken into consideration, that the tests were conducted without the object which is affected, which means that during a non-penetrating stroke into a human body the maximum deformation speeds are going to be smaller. However, the proportion of speed in relation to the type of the packet will be kept. Final conclusions from the conducted research. 1. Propagation velocity of the tension wave along the warp and weft threads in classic woven fabrics depends on the geometrical structure parameters of these fabric such as: weave, density of warp and weft threads. Depending on these parameters it is from 2 to 5 times smaller than the propagation velocity of the tension weave in the thread of which the fabric is made. 2. Maximum propagation velocity of the tension wave comparable to the propagation velocity of the tension wave in the thread can be observed in non-interlaced structures of a weave structural module of the type SMS 4. In case of woven structures, the largest propagation velocity of tensions can be observed in fabrics of a structural model of the SMS 1 type (plain weave), by a maximum density of warp and weft threads. 3. There are two optimum fabric structures that can be applied for the layers of a textile ballistic packet: - non-interlaced structure of a weave structural module SMS 4, - fabric of a weave structural module SMS 1 (plain weave) with maximum density of warp and weft threads. 4. For ballistic packets made of non-interlaced structures SMS 4 both safety criteria are fulfilled during fire by a significantly smaller aera density in relation to ballistic packets made of fabrics with plain weave. 5. At the moment the bullet is stopped by a ballistic packet SMS 4 the nonzero pressure zone is for the given number of layers the smallest in relation to all the other tested packets, and at the same time the deformation cone is the smallest. 6. Maximum deformation speed of the packet in the point where the bullet strikes is the lowest in SMS 4 packets, and at the same time the deformation cone is in that case the smallest, which minimizes the danger of a ballistic stroke for the human body.
Rocznik
Tom
Strony
3-206
Opis fizyczny
Bibliogr. 133 poz.
Twórcy
autor
- Katedra Automatyzacji Procesów Włókienniczych Politechnika Łódzka, stemp@p.lodz.pl
Bibliografia
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