Temat: light armour - Katalog OPAC zbiorów

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Tytuł:: IR Thermography methods on nondestructive testing of ballistic covers made of multi - layer carbon fiber
Autorzy:: Hłosta, P.
Świderski, W.
Szudrowicz, M.
Powiązania:: https://bibliotekanauki.pl/articles/244251.pdf
Data publikacji:: 2013
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: IR thermography
light armour
CFRP composite
nondestructive testing
Opis:: Presently a lot of designs of light armours are based mainly on the multilayer composite materials. Thanks to these materials it was possible to achieve highest levels of ballistic resistance of specific armour at limited weight. The weight (area density) and the performance have direct influence on the value of combat ability of equipment and soldiers. Carbon fibers are basic types of reinforcement used in composites. They have many technical applications including light ballistic covers where they are mostly used as multi-layer composite materials constituting a structure made of several interconnected layers or many layers of carbon fibers, or in combination with other materials. Light ballistic covers have usually thickness of several to 10-20 mm and potential defects occurring in them have thermo-physical properties definitely different than materials they are made of so the non-destructive tests using thermography methods may be effective in detecting these defects. The main methods of active thermographic tests are as follows [1, 2]: - Pulsed Thermography – PT, - Step Heating Thermography – SHT, - Lock-in Thermography – LT, - Vibrothermography – VT. In the paper an application of Step Heating Thermography and Vibrothermography to detection of delaminating area of CFRP composites after mechanical impacts is presented.
Źródło:: Journal of KONES; 2013, 20, 2; 167-173
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Wykrywanie wewnętrznych uszkodzeń w lekkich pancerzach kompozytowych metodami termografii w podczerwieni
IR Thermography Methods for Detection of Internal Defects in Light Composite Armours
Autorzy:: Świderski, W.
Szabra, D.
Szudrowicz, M.
Powiązania:: https://bibliotekanauki.pl/articles/157668.pdf
Data publikacji:: 2009
Wydawca:: Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:: lekki kompozytowy pancerz
badania nieniszczące
termografia w podczerwieni
light composite armour
nondestructive testing
IR thermography
Opis:: W artykule przedstawiono problematykę związaną z wykrywaniem podpowierzchniowych uszkodzeń powstałych w wyniku badań niszczących lekkich pancerzy kompozytowych stanowiących struktury wielowarstwowe wykonane z włókien aramidowych lub szklanych. Jako metodę nieniszczącą wykrywania strefy uszkodzenia zastosowano aktywną metodę termograficzną lock-in. Określenie wielkości strefy wewnętrznych uszkodzeń umożliwia porównywanie pancerzy wykonanych z różnych materiałów. Na podstawie przeprowadzonych badań stwierdzono, że strefa pod-powierzchniowych uszkodzeń materiału od strony uderzenia przez pocisk symulujący odłamek może być 3-krotnie większa od kalibru pocisku i 15 krotnie większa od strony przeciwnej dla lekkich pancerzy wykonanych na bazie włókna aramidowego lub szklanego.
Light composite armour is a preferred solution against military and paramilitary sources of present threats as the reducing mass of battle vehicles provides a possibility of their quick air-transport. The light armours of these vehicles should be resistant against: common and rifle bullets, grenades, anti-personal mines, IED - improvised explosive devices. Recently, NATO countries have initiated an intensive investigation process to introduce modern composite materials into protection systems of armored vehicles and infantry fighting vehicles. The composites reinforced by fibres are used in structural elements of vehicle trunks. Materials of composite armours include graphite epoxy, glass epoxy and aramid fiber composites. The composites that have been examined can include a variety of defects, such as ballistic impacts, embedded defects, manufacturing defects, thermal damage, moisture ingress and other induced defects. Methods for testing ballistic protection of light armours are known and used. First of all, they consist of checking armours resistance against the bullets where the bullet velocity is known. Moreover, the V50 velocity is defined during the test. In this method the V50 velocity of a round or standard fragment is defined (according to STANAG 2920) as a velocity at which armour is penetrated with the probability of 50% (Fig. 2). The distribution of points hit by bullets or fragments on the surface of an armour is also important. In fact, only correct distribution of these points provides a guaranty for an impartial assessment of tested designs. After hitting by a bullet, shape and size of an area of damage in composite armours depends on the type and design of armour, so type of reinforcing material is particularly important. Knowledge of damage characteristics allows arranging the hitting points to avoid overlapping of damaged areas. Considering quality and protection ability of armour, the extent of internal damage should be kept in mind besides the direct ability to stop bullets and fragments. The Military Institute of Armament Technology in cooperation with the Military Institute of Armour & Automotive Technology carried out a project on using nondestructive testing method in order to evaluate destruction zones in light ballistic armour which appear as a result of impact of bullets and fragments. Nondestructive testing by using active IR thermography methods is very useful for evaluation of internal defects. In the paper there is presented the dependence between the energy of fragments/or bullets and the dimension of internal defects (Figs. 8 and 11).
Źródło:: Pomiary Automatyka Kontrola; 2009, R. 55, nr 11, 11; 906-908
0032-4140
Pojawia się w:: Pomiary Automatyka Kontrola
Dostawca treści:: Biblioteka Nauki

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