Experimental and numerical analysis concerning the behaviour of OL50 steel grade specimens coated with polyurea layer under dynamics loadings

Bucur, Florina; Trană, Eugen; Rotariu, Adrian; Gavrus, Adinel; Barbu, Cristian; Guines, Dominique

doi:10.1051/epjconf/20159404044

Cited by 5 publications

(6 citation statements)

References 11 publications

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“…Polyurea has been reported as a good candidate for impulsive loading applications since it has been demonstrated that it is intrinsically reinforced by its morphology, consisting of a continuous rubbery soft matrix containing well dispersed nanoscaled hard domains . Recent studies proved that a polyurea coated steel plate could suffer lower deformations than an uncoated one when subjected to impulsive loading . A polyurea nanocomposite could present even more advantages than the neat polyurea.…”

Section: Introductionmentioning

confidence: 99%

New polyurea MWCNTs nanocomposite films with enhanced mechanical properties

Toader

Rusen

Teodorescu

et al. 2017

J of Applied Polymer Sci

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Polyurea nanocomposites represent a promising option in the development of advanced materials for applications that require high mechanical resistance. This article describes an optimized synthetic route for obtaining polyurea nanocomposites with enhanced mechanical properties by employing epoxy‐functionalized multiwalled carbon nanotubes (MWCNTs) as reinforcing agent. The experimental measurements revealed that these functionalized nanofillers have a positive effect on the properties of the composite only until they reach a certain concentration; therefore, the optimal composition was reported (the samples containing 0.2 weight % functionalized MWCNTs). The functionalization of the MWCNTs was confirmed through RAMAN, X‐ray photoelectron spectroscopy, scanning electron microscopy and thermogravimetric analysis, while the polyurea nanocomposites obtained have been characterized by thermal (differential scanning calorimetry and TGA) and mechanical (dynamic mechanical analysis and tensile tests) analyses. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45061.

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Section: Introductionmentioning

confidence: 99%

New polyurea MWCNTs nanocomposite films with enhanced mechanical properties

Toader

Rusen

Teodorescu

et al. 2017

J of Applied Polymer Sci

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“…In this regard, for a better understanding of materials behavior, during the experimental tests (mechanical testing, ultrasonic testing), different types and configurations of samples and measurement tools have been tested (simple/bilayer/multilayer configurations, force or pressure transducers, videospeed cameras, scanning electron microscopy, computed tomography etc. ), in static, dynamic or impulsive regime, corroborated with numerical simulation, in order to obtain valid outcomes and results that can be extrapolated to large-scale experiments and applications [13,[20][21][22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Multilayered Plates with Hyperelastic Coatings Subjected to Dynamic Loadings by Impact at Low Velocities

Bucur,

Matache

2024

Mater. Plast.

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This paper describes the use of video and digital image processing in investigation of the impact between a rigid hemispherical shape impactor and Hybrid Polyurea-Polyurethane-MWCNTs Nanocomposite Coatings. An experimental study was performed for six sample configurations: single aluminum plates (reference test), multilayer plates with 4 types of coatings and double aluminum plates. The impact phenomenon was recorded with a high-speed video camera and the variation of the projectile s velocity during the impact was obtained through digital analysis. Additionally, the test was instrumented using a force sensor specially designed and mounted on the impactor. The video processing was used to draw the velocity curves and to estimate the evolution of the contact forces between the impactor and the multilayer structures, the results obtained being compared with the force sensor data. Some differences between these two types of measurements are observed, so in order to analyze the configurations behavior, a numerical study of the phenomena was performed in LS-DYNA software using a 2D axial symmetric model. The simulations showed that the profile of the force evolution measured with the sensor is affected by the chosen constructive solution and the data obtained based on the video images are more accurate. The deformations were analyzed, the maximum deformation based on image processing and the residual deformation based on 3D Scan post-test. The video technique combined with 3D Scan are precise enough to study the impact at low velocities and the numerical simulations provide results according to reality. The hyperelastic coatings contribute to a better resistance of the aluminum plates.

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“… Composite structure implementations are structures employed to absorb energy through plastic deformation, limiting the transferred force due to the specific stress-strain relationship of the material. Significant examples are hyperelastic materials [ 9 , 10 ], metal foams [ 11 , 12 , 13 ] and sandwich structures [ 14 ]. Detonation wave deflection: systems that deflect the blast away from the structure they are protecting, such as V-shells [ 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

“…Composite structure implementations are structures employed to absorb energy through plastic deformation, limiting the transferred force due to the specific stress-strain relationship of the material. Significant examples are hyperelastic materials [ 9 , 10 ], metal foams [ 11 , 12 , 13 ] and sandwich structures [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study on Perforated Plate Mitigation Capacity to Near-Field Blasts

Puică¹,

Trană

Pupăză

et al. 2023

Materials

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Based on the analysis of existing collective shockwave protection methods worldwide, this paper addresses the mitigation of shock waves by means of passive methods, namely the use of perforated plates. Employing specialized software for numerical analysis, such as ANSYS-AUTODYN 2022R1®, the interaction of shock waves with a protection structure has been studied. By using this cost-free approach, several configurations with different opening ratios were investigated, pointing out the peculiarities of the real phenomenon. The FEM-based numerical model was calibrated by employing live explosive tests. The experimental assessments were performed for two configurations, with and without a perforated plate. The numerical results were expressed in terms of force acting on an armor plate placed behind a perforated plate at a relevant distance for ballistic protection in engineering applications. By investigating the force/impulse acting on a witness plate instead of the pressure measured at a single point, a realistic scenario can be considered. For the total impulse attenuation factor, the numerical results suggest a power law dependence, with the opening ratio as a variable.

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Experimental and numerical analysis concerning the behaviour of OL50 steel grade specimens coated with polyurea layer under dynamics loadings

Cited by 5 publications

References 11 publications

New polyurea MWCNTs nanocomposite films with enhanced mechanical properties

New polyurea MWCNTs nanocomposite films with enhanced mechanical properties

Assessment of Multilayered Plates with Hyperelastic Coatings Subjected to Dynamic Loadings by Impact at Low Velocities

Experimental and Numerical Study on Perforated Plate Mitigation Capacity to Near-Field Blasts

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