Low velocity bending impact behavior of foam core sandwich beams: Experimental

Çalışkan, Umut; Apalak, M. Kemal

doi:10.1016/j.compositesb.2016.12.038

Cited by 62 publications

(31 citation statements)

References 31 publications

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“…However, few scholars focused on the PU foams filled with expanded vermiculite (EV) particles of micron size in recent years. Furthermore, some scholars used three-dimensional (3D) warp-knitted spacer fabrics and metallic frame to prepare the sandwich-structured PU composites [12,13,14], the design of which increases the weight of the composites and limits their application range.…”

Section: Introductionmentioning

confidence: 99%

Expanded Vermiculite-Filled Polyurethane Foam-Core Bionic Composites: Preparation and Thermal, Compression, and Dynamic Cushion Properties

Wang

Ren

et al. 2019

Polymers

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In this article, expanded vermiculite (EV)-enhanced polyurethane foam bionic composites inspired by pomelo peel is proposed. The columnar lattice structure mold is employed to constitute the periodic interface structure and gradient foam structure, and the nylon nonwoven fabric is combined as the surface layer. The effects of EV content on the thermal, compression, and dynamic cushion properties of bionic composites are investigated. Results show that residual char increases with EV content, which conduces to decrease the release of heat flow. The proposed bionic composite with columnar lattice structure has optimal compressive modulus, energy absorption and dynamic cushion efficacy when 1 wt% EV is added. However, its performance decreases slowly when EV fillers are continuously added because the cell morphology is changed from round to irregular shape and the interfacial adhesion of filler–matrix is weakened. Owing to their unique bionic structure, composites can absorb 99% of the energy impacted by flat impactor within a smaller deformation and achieve 97% absorption efficiency for a hemispheric impactor in cushion test.

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Section: Introductionmentioning

confidence: 99%

Expanded Vermiculite-Filled Polyurethane Foam-Core Bionic Composites: Preparation and Thermal, Compression, and Dynamic Cushion Properties

Wang

Ren

et al. 2019

Polymers

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“…1). Because EPS material property values are strongly dependent on its density [12,14], three separate material descriptions were defined corresponding to different EPS densities recorded in laboratory tests (Tab. 1).…”

Section: Fem Model Descriptionmentioning

confidence: 99%

“…The most common types of panels used in civil engineering are composed of steel or aluminium facings and a polyurethane or expanded polystyrene foam core. Due to complexity of layer interactions even these widespread combinations of materials are of a great interest to researchers in terms of geometry optimisation (length, relative layer thickness, facing geometry) [3,4,14], localised load effects and varied support conditions [4][5][6][7], the influence of openings [8] or submission to extreme loads (windborne debris, explosions) [10,11]. Exchanging thin metal facings with relatively thicker, wood-based ones and using a foam core of a significant thickness created a sandwich panel variation called the Structural Insulated Panel (SIP).…”

Section: Introductionmentioning

confidence: 99%

Failure mode prediction for composite structural insulated panels with MgO board facings

Smakosz

Kreja

2018

AIP Conference Proceedings

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Abstract. Sandwich panels are readily used in civil engineering due to their high strength to weight ratio and the ease and speed of assembly. The idea of a sandwich section is to combine thin and durable facings with a light-weight core and the choice of materials used allows obtaining the desired behaviour. Panels in consideration consist of MgO (magnesium oxide) board facings and expanded polystyrene core and are characterized by immunity to biological corrosion, a high thermal insulation and a relatively low impact on environment. Customizing the range of panels to meet market needs requires frequent size changes, leading to different failure modes, which are identified in a series of costly full-scale laboratory tests. A nonlinear numerical model was created with a use of a commercial ABAQUS code and a user-defined procedure, which is able to reproduce observed failure mechanisms; its parameters were established on the basis of small-scale tests and numerical experiments. The model was validated by a comparison with the results of the full-scale bending and compression tests. The results obtained were in satisfactory agreement with the test data.

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“…Sandwich composites with fibre reinforced plastic (FRP) facesheets have emerged as a major class of lightweight structural materials in a wide range of engineering fields including aerospace, automotive, locomotive, building, wind energy and marine structures. The impact performance of sandwich structures has been identified as being of considerable importance [1] and it has been noted that sandwich structures must dissipate the impact energy to protect either the rest of the structure or humans during impact loads. However, some sandwich composites have been shown to be vulnerable to damage caused by impact [2].…”

Section: Introductionmentioning

confidence: 99%

A new method for the study of parabolic impact of foam-core sandwich panels

Ramakrishnan

Guérard

Mahéo

et al. 2019

Composites Part B: Engineering

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Lightweight sandwich panels with composite facesheets and foam core have high impact energy absorption capability and are widely employed in multifunctional applications such as aircraft and marine structures. The dynamic behaviour of sandwich panels is typically studied for impact loading at normal angle of incidence but the structures are more frequently loaded at some oblique angle or with a complex tri-dimensional trajectory in real engineering situations. The damage area and damage modes for these trajectories are significantly different and it is not sufficient to study only normal impacts. There are well established experimental protocols for normal or oblique impact tests using devices like the drop tower, but impacts with complex trajectory are difficult to characterise experimentally. In this paper, a Gough-Stewart platform with six degrees of freedom has been modified to develop an original tri-dimensional impact device called Hexapod. The trajectory is defined to an impactor attached to the seventh jack of the Hexapod to study the response of sandwich plates to impact loading with complex trajectories. The applicability of the newly developed device is demonstrated by studying parabolic impact with different trajectories on sandwich plates with Kevlar facesheets and Rohacell foam core. The time history of vertical and horizontal components of force is measured using tri-axial load cell and strain history is obtained from Digital Image Correlation of a high speed camera images. The results of the parabolic impact show the importance of shear behaviour of the foam in the progression of damage in the sandwich panels. Additionally, the response of the sandwich panels to parabolic impact was simulated numerically using explicit finite element code LS-DYNA. The results of the FE model are compared with experimental data in terms of the force history and strain contours.

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Low velocity bending impact behavior of foam core sandwich beams: Experimental

Cited by 62 publications

References 31 publications

Expanded Vermiculite-Filled Polyurethane Foam-Core Bionic Composites: Preparation and Thermal, Compression, and Dynamic Cushion Properties

Expanded Vermiculite-Filled Polyurethane Foam-Core Bionic Composites: Preparation and Thermal, Compression, and Dynamic Cushion Properties

Failure mode prediction for composite structural insulated panels with MgO board facings

A new method for the study of parabolic impact of foam-core sandwich panels

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