This is a study to investigate ballistics performance of armor structures with in-layer deflector against projectiles. For this purpose, the armor structure, which consists of a v-cross section sheet metal array covered with aluminum and steel plates, has been designed and optimized. Firstly, numerical simulations were studied using the finite-element method (FEM). The ANSYS LS-DYNA FE software is used for the ballistic analysis. The Johnson-Cook constitutive equation and damage model were used to model the behavior of metal armors under impact in the ballistic simulations. In the next step, experimental studies were carried out. Penetration depths were measured; including the magnitude of plate bending in front of the target plate and bulging behind it. Comparisons between the results of the finite element analysis (FEA) and the tests reveal that a bullet with a velocity of 868 m/s penetrated the target, but the target could not be penetrated at a firing speed of 631 m/s Furthermore the experimental and numerical results were in good agreement.
Recently published research indicates that laminated composites have limited applications in advanced structural systems due to their low impact performance. The aim of this study is to give general information about the most commonly used materials and ballistic test methods to the new researchers who want to work on ballistic related subjects. In addition, to summarize the topics related to simulation methods such as FEM and numerical methods which are used most in ballistics. Finally, it is to enlighten them by giving suggestions to the researchers who will work on ballistics in the future.This review paper is focused on the impact resistance and penetration behavior of composites reinforced with fibers as well as their suitability for modern structural applications. The historical development of composite laminates is first reviewed in detail, and notable researchers and their contributions are then reviewed. Also included are reviews on published experimental, numerical, and analytical work on the low velocity impact of composite laminates. Relevant results will be discussed and the recommendations that need to be resolved in the future will be addressed.
Mermi gibi hızlı parçacıkların, karşısında ki bir yapıyı delip geçmesini önlemeye yönelik çalışmalar, ilk çağlardan beri insanlık için süregelen uğraşı olmuştur. Mermi ve delici parçalara karşı zırh tasarımı çalışmaları ilgi odağı olmaya devam etmektedir. Bu amaçla yüzlerce çalışmada onlarca malzeme denenmiştir. Çeşitli yapılar, birçok geometrik varyasyonlar ve formlarda tasarlanmakta, test ortamlarında balistik davranışları ölçülmektedir. Levhalı tasarımlar ağırlıklı olarak alüminyum, seramik ve zırh çeliği levhalarla oluşturulmuşlardır. Ön ve arka destek katmanları olarak bu malzemeler kullanılmıştır. Bazı çalışmalarda, polietilen, fiber, kevlar kumaş gibi malzemelerle bileşik ve kompozit yapılar meydana getirilmiştir. Kompozit yapıların bazılarında, mermi ve delici parçacık yönünü değiştirebilecek farklı geometrik yapılar tasarlanmıştır. Bu sert metal malzemeli yapı, kumaş içine alınarak kolay hareket ve taşınabilirlik ihtiyacı karşılanmaya çalışılmıştır. Bazı çalışmalarda seçilen metal levha malzeme, çeşitli kalınlık ve sıralamalarla test edilmiş, balistik performansları ve darbe etkisine karşı dayanım özellikleri tespit edilmiştir. Bu derleme çalışmasında son yıllarda yapılan çalışmaların bir kısmının özetleri sunulmakta, gelecekte yapılabilecek çalışmalara bir hedef ve perspektif oluşturulmak istenmektedir.
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