Processing, compression response and finite element modeling of syntactic foam based interpenetrating phase composite (IPC)

Bulletin of the Polish Academy of Sciences Technical Sciences

Witek³

et al. 2015

Abstract. The paper presents the experimental results of fabrication and characterization of ceramic-elastomer composites. They were obtained using pressure infiltration of porous ceramics by elastomer As a result the composites in which two phases are interpenetrating three-dimensionally and topologically throughout the microstructure were obtained. In order to enhance mechanical properties of preforms a high isostatic pressure method was utilized. The obtained ceramic preforms with porosity gradient within the range of 20-40% as well as composites were characterized by X-ray tomography. The effect of volume fraction of pores on residual porosity of composites was examined. These results are in accordance with SEM images which show the microstructure of composites without any delaminations and voids. Such composites exhibit a high initial strength with the ability to sustain large deformations due to combining the ceramic stiffness and rubbery elasticity of elastomer. Static compression tests for the obtained composites were carried out and the energy dissipated during compression was calculated as the area under the stress-strain curve. The dynamic behavior of the composite was investigated using the split Hopkinson pressure bar technique. It was found that ceramic-elastomer composites effectively dissipate the energy. Moreover, a ballistic test was carried out using armor piercing bullets.

Section: Fabrication and Characterization Of Composite Materials Basesupporting

confidence: 58%

“…The energy dissipated by composite during loading was evaluated by integrating the area under the stress-strain curve, namely [5,30].…”

Section: Methodsmentioning

confidence: 99%

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Fabrication and characterization of composite materials based on porous ceramic preform infiltrated by elastomer

Chabera¹,

Bulletin of the Polish Academy of Sciences Technical Sciences

Witek³

et al. 2015

“…These materials are also called co-continuous or "3-3" composites. It means that matrix and reinforcement are interconnected in all the three spatial dimensions [16,17].…”

Section: Methodsmentioning

confidence: 99%

Comparison of numerical and experimental study of armour system based on alumina and silicon carbide ceramics

Chabera¹,

Bulletin of the Polish Academy of Sciences Technical Sciences

Morka³

et al. 2015

Abstract. The main goal of this numerical and experimental study of composite armour systems was to investigate their ballistic behaviour. Numerical simulations were employed to determine the initial dimensions of panel layers before the actual ballistic test. In order to achieve this aim, multivariate computations with different thicknesses of panel layers were conducted. Numerical calculations were performed with the finite element method in the LS-DYNA software, which is a commonly used tool for solving problems associated with shock wave propagation, blasts and impacts. An axisymmetric model was built in order to ensure sufficient discretization. Results of a simulation study allowed thicknesses of layers ensuring assumed level of protection to be determined.According to the simulation results two armour configurations with different ceramics have been fabricated. The composite armour systems consisted of the front layer made of Al2O3 or SiC ceramic and high strength steel as the backing material. The ballistic performance of the proposed protective structures were tested with the use of 7.62 mm Armour Piercing (AP) projectile. A comparison of impact resistance of two defence systems with different ceramic has been carried out. Application of silicon carbide ceramic improved ballistic performance, as evidenced by smaller deformations of the second layer. In addition, one of armour systems was complemented with an intermediate ceramic-elastomer layer. A ceramic-elastomer component was obtained using pressure infiltration of gradient porous ceramic by elastomer. Upon ballistic impact, the ceramic body dissipated kinetic energy of the projectile. The residual energy was absorbed by the intermediate composite layer. It was found, that application of composite plates as a support of a ceramic body provided a decrease of the bullet penetration depth.

“…These materials are called co-continuous or "3-3" composites also. It means that matrix and reinforcement are interconnected in all the three spatial dimensions [19]. In the case of the developed armour system, ceramic layer was used to dissipate the energy, whereas ceramic/polymer composite was applied as backing material to support the ceramic.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental study of armour system consisted of ceramic and ceramic- elastomer composites

Chábera¹,

Bulletin of the Polish Academy of Sciences Technical Sciences

Morka³

et al. 2014

Abstract. The paper presents numerical and experimental results in the study of composite armour systems for ballistic protection. The modelling of protective structures and simulation methods of experiment as well as the finite elements method were implemented in LS DYNA software. Three armour systems with different thickness of layers were analyzed. Discretization for each option was built with three dimensional elements guaranteeing satisfactory accuracy of the calculations. Two selected armour configurations have been ballistically tested using the armour piercing (AP) 7.62 mm calibre. The composite armour systems were made of Al2O3 ceramics placed on the strike face and high strength steel as a backing material. In case of one ballistic structure system an intermediate ceramic-elastomer layer was applied. Ceramic-elastomer composites were obtained from porous ceramics with porosity gradient using pressure infiltration of porous ceramics by elastomer. The urea-urethane elastomer, as a reactive liquid was introduced into pores. As a result composites, in which two phases were interconnecting three-dimensionally and topologically throughout the microstructure, were obtained. Upon ballistic impact, kinetic energy was dissipated by ceramic body The residual energy was absorbed by intermediate composite layer. Effect of the composite shell application on crack propagation of ceramic body was observed.