Numerical modeling of response of monolithic and bilayer plates to impulsive loads

Amini, M.R.; Amirkhizi, Alireza V.; Nemat‐Nasser, Sia

doi:10.1016/j.ijimpeng.2009.04.005

Cited by 84 publications

(57 citation statements)

References 9 publications

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“…18(a) and 19(a). This phenomenon is directly related to the location of the polyurea layer and has been described by Amini et al [13][14][15][16]. Polyurea is a highly pressure sensitive elastomer with its shear and bulk stiffness increasing remarkably with increasing pressure [8].…”

Section: Energy Redistribution Behaviormentioning

confidence: 77%

“…Their results suggest that separating the composite facesheet from the foam core by a thin interlayer of polyurea can be very beneficial in comparison to the conventional sandwich plate design. Amini et al [13][14][15][16] experimentally and numerically studied the dynamic response of circular monolithic steel and steel-polyurea bilayer plates to impulsive loads. More importantly they focused on the significance of the relative position of the polyurea layer with respect to the loading direction.…”

Section: Introductionmentioning

confidence: 99%

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Blast Mitigation in a Sandwich Composite Using Graded Core and Polyurea Interlayer

et al. 2011

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The dynamic behavior of two types of sandwich composites made of E-Glass Vinyl-Ester (EVE) facesheets and Corecell™ A-series foam with a polyurea interlayer was studied using a shock tube apparatus. The materials, as well as the core layer arrangements, were identical, with the only difference arising in the location of the polyurea interlayer. The foam core itself was layered with monotonically increasing wave impedance of the core layers, with the lowest wave impedance facing the shock loading. For configuration 1, the polyurea interlayer was placed behind the front facesheet, in front of the foam core, while in configuration 2 it was placed behind the foam core, in front of the back facesheet. A high-speed side-view camera, along with a high-speed back-view 3-D Digital Image Correlation (DIC) system, was utilized to capture the real time deformation process as well as mechanisms of failure. Post mortem analysis was also carried out to evaluate the overall blast performance of these two configurations. The results indicated that applying polyurea behind the foam core and in front of the back facesheet will reduce the back face deflection, particle velocity, and in-plane strain, thus improving the overall blast performance and maintaining structural integrity.

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Section: Energy Redistribution Behaviormentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Blast Mitigation in a Sandwich Composite Using Graded Core and Polyurea Interlayer

et al. 2011

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“…is proved that the polyurea layer coated on the back face of the mild plate was more e ective in increasing the blast resistance e ect than that applied on the front face. Amini et al [13][14][15] investigated the e ect of the polyurea coating on the front and back faces of steel plates. When the coating was sprayed on the front face of the circular steel plate, the compression of the polyurea under the shock loading increased its sti ness, resulting in a better impedance match with the steel plate.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Polyurea‐Coated Steel Plates at Underwater Explosive Loading

Dai

Wan

et al. 2018

Advances in Materials Science and Engineering

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To improve the survivability of ship structures at underwater explosion, thin steel plates coated with polyurea were used to investigate the blast protection effect. During the experimental tests of bare steel plates at different standoff, an appropriate distance was selected as the reference standoff to perform the tests of coated plates. Experimental tests of different coating locations (front versus back) and coating thickness were carried out to study the influencing factors of blast resistance for metal substrate plates. Compared with the bare steel plates, the polyurea coating was found to reduce the deformation of the test plates at blast tests in both cases of the front and back surface locations of the polyurea layer. An increase in the coating thickness also mitigates substantially the deformation of plates. In addition, the properties of the material and the substrate-coating bond strength may also affect the protective effect of the polyurea coating.

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“…It is important to recognize the inconsistency between these observations and the localization analyses which do not anticipate any differences based on the position of the coating layer relative to the loading direction. Numerical simulations and experiments were also performed by Amini et al (2010b); Amini and Nemat-Nasser (2010) using a calibrated elastic-plastic constitutive model for the DH-36 and a viscoelastic constitutive model for the polyurea. The simulations i ndicated that the average effective plastic strain in the DH-36 plate decreased in comparison to the bare steel plate when the polyurea coating was placed on the backside of the specimen, but increased significantly when placed on the front side of the specimen.…”

Section: Introductionmentioning

confidence: 99%

On the dynamics of localization and fragmentation: V. Response of polymer coated Al 6061-O tubes

et al. 2011

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In this series of papers, we investigate the mechanics and physics of localization and fragmentation in ductile materials. The behavior of ductile metals at strain rates of about 4,000-15,000 per second is considered. The expanding ring experiment is used as the vehicle for examining the material behavior in this range of strain rates. In Parts I-III, we examined the response of rings with cross-sectional aspect ratios in the range of 1-10, exhibiting a transition from diffuse necking to sheet-mode localization. In Part IV, we reported on experimental observations of high strainrate expansion of Al 6061-O tubes. In the present paper, we investigate the effect of polymer coatings on Al 6061-O tubes; specifically, polyurea and polycarbonate coatings are investigated as coating materials. It is demonstrated that there are two effects of the polymer coating on the overall deformation of the Al 6061-O tube specimens. First, the additional mass of the coating material results in an inertial effect; therefore, thicker coatings result in a slower overall expansion and hence for a limited impulse loading, less overall straining of the metallic specimen. Second, the flow resistance of the polymer dissipates additional energy and can prevent failure in the metallic specimen. This effect is much more pronounced in polycarbonate, the material with a larger strength. Finally, it is demonstrated that the polymer coating does not significantly influence the dynamic forming limit of the metallic material.

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Numerical modeling of response of monolithic and bilayer plates to impulsive loads

Cited by 84 publications

References 9 publications

Blast Mitigation in a Sandwich Composite Using Graded Core and Polyurea Interlayer

Blast Mitigation in a Sandwich Composite Using Graded Core and Polyurea Interlayer

Experimental Investigation of Polyurea‐Coated Steel Plates at Underwater Explosive Loading

On the dynamics of localization and fragmentation: V. Response of polymer coated Al 6061-O tubes

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