Manufacturing and characterization of polyurethane based sandwich composite structures

Mohamed, M.; Anandan, Sudharshan; Huo, Z.; Birman, Victor; Volz, Jeffery S.; Chandrashekhara, K.

doi:10.1016/j.compstruct.2014.12.042

Cited by 93 publications

(50 citation statements)

References 12 publications

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“…Further combination of flexural and compressive strength together results in weight savings for the composite structure. M. Mohamed [2] carried out mechanical characterization of sandwich structure based on PU foams with GFRP sandwich panels and showcased that with increase in core density, the face bending stress increases.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Characterization of PU Based Sandwich Composites with Variation in Core Density

L.¹

2015

IJMSA

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Sandwich composite finds its application in varied fields of engineering, mainly due to the fact that they are light weight, have a better strength to weight ratio and to an extent corrosion resistant. Each application might involve different fabrication technique and selection of appropriate foam core and facings. In this study, three different core densities of PU foam combined with glass fiber facings are fabricated using vacuum bagging technique. Because of their complex nature of fabrication by adding epoxy resin between facings and core makes the evaluation of their mechanical characteristics quite difficult to predict. Since core material being the weakest part of the sandwich composite, studies are carried out to determine the effect of change in mechanical properties by increasing the core thickness and density. Further, the mechanical response of these sandwich composites are studied by carrying out flatwise, edgewise compressive test and flexural strength on a Mecmesin MultiTest 10 -i testing equipment as per ASTM standards. It is found that with increase in core density the flatwise compressive modulus increases and facesheet wrinkling in low density foam and core debonding in higher density foam was noticed in edgewise compression. The flexural tests showed that with increase in core thickness marginally increased the face being stress as compared with increase in core density.

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Section: Introductionmentioning

confidence: 99%

Mechanical Characterization of PU Based Sandwich Composites with Variation in Core Density

L.¹

2015

IJMSA

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“…They used experimental modal analysis method and verified the results with that of numerical solution. Shettigar et al [3] manufactured glass fiber/polyurethane composite sandwich structures with three types of foam cores by using vacuum assisted resin transfer molding process. They carried out core shear, flatwise compression and edgewise compression tests to determine the respective stiffness and strength of the models.…”

Section: Introductionmentioning

confidence: 99%

Investigation Thickness Effects of Polyurethane Foam Core Used in Sandwich Structures via Modal Analysis Method

2017

May 22-24, 2017 Kuala Lumpur (Malaysia) ICLTET-2017, ACBES-2017

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Abstract-In this study, the effects of reinforcement thickness of polyurethane (PU) foam used as viscoelastic core in sandwich structures for vibration isolation were investigated. For this purpose, three different sandwich structures were prepared by using ST37 450x450x0.9 mm3 plates and PU foam in 16, 26 and 36 mm thicknesses. For each sandwich structure, the dynamic properties (natural frequencies, mod shapes, damping ratio) were obtained by using experimental modal analysis method. Also, the experimental results were compared with the results obtained from ANSYS finite element method. For the first five modes, natural frequencies and damping ratios of PU reinforced sandwich structures were observed to increase with PU foam reinforcement thickness.

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“…[2][3][4] In most cases, the preparation of the foam core and consolidation of textilereinforced top layers are individual process steps, making an additional joining step necessary. [5] With the implementation of a PUR spray coat method, an efficient processing technology of a foaming matrix system in combination with reinforcing fibers offers novel options. In the long fiber injection (LFI) process for instance, chopped glass fibers are mixed with the PUR matrix, and discharged simultaneously into an open mold.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Geometrical and Process‐Related Parameters on the Impregnation Quality of Advanced Cellular Composites

2017

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Based on the well-established polyurethane (PUR) spray coat method, an integral manufacturing process is developed to simultaneously create textile-reinforced top and bottom layers as well as the cellular core in one single production step for advanced sandwich structures. Since the foaming matrix impregnates the textile layers during expansion and also serves as core material in the final part, these sandwich elements are connected cohesively with each other. Within this paper, impregnation studies are conducted to evaluate the influence of process parameters, such as mold temperature and dwelling time of the foam matrix, as well as part geometry and foam density on the local yarn impregnation. Evaluation of cell morphology is performed by measuring the cell size distribution inside impregnated yarns.

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Manufacturing and characterization of polyurethane based sandwich composite structures

Cited by 93 publications

References 12 publications

Mechanical Characterization of PU Based Sandwich Composites with Variation in Core Density

Mechanical Characterization of PU Based Sandwich Composites with Variation in Core Density

Investigation Thickness Effects of Polyurethane Foam Core Used in Sandwich Structures via Modal Analysis Method

Analysis of Geometrical and Process‐Related Parameters on the Impregnation Quality of Advanced Cellular Composites

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