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

Sunith Babu L.; H. K. Shivanand

doi:doi:10.11648/j.ijmsa.20150404.19

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

Sunith Babu L., H. K. Shivanand

Published in International Journal of Materials Science and Applications (Volume 4, Issue 4)

Received: 16 June 2015 Accepted: 7 July 2015 Published: 18 July 2015

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Abstract

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.

Published in	International Journal of Materials Science and Applications (Volume 4, Issue 4)
DOI	10.11648/j.ijmsa.20150404.19
Page(s)	277-282
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2015. Published by Science Publishing Group

Keywords

Flatwise Compression, Edgewise Compression, Polyurathene Foam Core, Vacuum Bagging Technique, Sandwich Composite

References

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[2]	M. Mohamed, S. Anandan, Z. Huo, V. Birman, J. Volz, K. Chandrashekhara, Manufacturing and characterization of polyurethane based sandwich composite structures, Journal of Composites Structures, 123, 2015, 169 – 179.
[3]	Dai J, Hahn HT. Flexural behavior of sandwich beams fabricated by vacuumassisted resin transfer molding. Compos Struct 2003;61:247–53.
[4]	Manalo AC, Aravinthan T, Karunasena W, Islam MM. Flexural behavior of structural fiber composite sandwich beams in flatwise and edgewise positions. Compos Struct 2010;92:984–95.
[5]	Xiong J, Ma L, Wu L, Liu J, Vaziri A. Mechanical behavior and failure of composite pyramidal truss core sandwich columns. Compos B 2011;42:938–45.
[6]	Carlsson L., Sendlein S., Merry S., Characterization of core/face shear fracture of composite sandwich beam, J. Comp. Mater., 25, 101-116 (1991).
[7]	Asad Mirzapour, Mohammad Hossein Beheshty*, and Mehdi Vafayan, The Response of Sandwich Panels with Rigid Polyurethane Foam Cores under Flexural Loading, Iranian Polymer Journal 14 (12), 2005, 1082-1088.
[8]	Vijay Kumar. Ma, Bhimasen Soragaon, Fabrication and Evaluation of Multilayered Polyurethane Foam Core Sandwich Panels for Static Flexural Stiffness, Procedia Engineering 97 ( 2014 ) 1227 – 1236.
[9]	Jongman K., Stephen R., Design of sandwich structures for concentrated loading, Comp Struc., 59, 365-373 (2001).
[10]	Sourabha S Havaldar, Ramesh S Sharma, “Experimental investigation of dynamic characteristics of multilayer PU foam Sandwich panels”, Journal of Minerals and Materials characterization and Engineering, 2013, 1, 201-206.

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APA Style

Sunith Babu L., H. K. Shivanand. (2015). Mechanical Characterization of PU Based Sandwich Composites with Variation in Core Density. International Journal of Materials Science and Applications, 4(4), 277-282. https://doi.org/10.11648/j.ijmsa.20150404.19

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ACS Style

Sunith Babu L.; H. K. Shivanand. Mechanical Characterization of PU Based Sandwich Composites with Variation in Core Density. Int. J. Mater. Sci. Appl. 2015, 4(4), 277-282. doi: 10.11648/j.ijmsa.20150404.19

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AMA Style

Sunith Babu L., H. K. Shivanand. Mechanical Characterization of PU Based Sandwich Composites with Variation in Core Density. Int J Mater Sci Appl. 2015;4(4):277-282. doi: 10.11648/j.ijmsa.20150404.19

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@article{10.11648/j.ijmsa.20150404.19,
  author = {Sunith Babu L. and H. K. Shivanand},
  title = {Mechanical Characterization of PU Based Sandwich Composites with Variation in Core Density},
  journal = {International Journal of Materials Science and Applications},
  volume = {4},
  number = {4},
  pages = {277-282},
  doi = {10.11648/j.ijmsa.20150404.19},
  url = {https://doi.org/10.11648/j.ijmsa.20150404.19},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijmsa.20150404.19},
  abstract = {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.},
 year = {2015}
}

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TY - JOUR
T1 - Mechanical Characterization of PU Based Sandwich Composites with Variation in Core Density
AU - Sunith Babu L.
AU - H. K. Shivanand
Y1 - 2015/07/18
PY - 2015
N1 - https://doi.org/10.11648/j.ijmsa.20150404.19
DO - 10.11648/j.ijmsa.20150404.19
T2 - International Journal of Materials Science and Applications
JF - International Journal of Materials Science and Applications
JO - International Journal of Materials Science and Applications
SP - 277
EP - 282
PB - Science Publishing Group
SN - 2327-2643
UR - https://doi.org/10.11648/j.ijmsa.20150404.19
AB - 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.
VL - 4
IS - 4
ER -

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Author Information

Sunith Babu L.

Dept of Mechanical Engineering, MSRIT, Bangalore, India
H. K. Shivanand

Dept of Mechanical Engineering, UVCE, Bangalore, India

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APA Style

Sunith Babu L., H. K. Shivanand. (2015). Mechanical Characterization of PU Based Sandwich Composites with Variation in Core Density. International Journal of Materials Science and Applications, 4(4), 277-282. https://doi.org/10.11648/j.ijmsa.20150404.19

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ACS Style

Sunith Babu L.; H. K. Shivanand. Mechanical Characterization of PU Based Sandwich Composites with Variation in Core Density. Int. J. Mater. Sci. Appl. 2015, 4(4), 277-282. doi: 10.11648/j.ijmsa.20150404.19

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AMA Style

Sunith Babu L., H. K. Shivanand. Mechanical Characterization of PU Based Sandwich Composites with Variation in Core Density. Int J Mater Sci Appl. 2015;4(4):277-282. doi: 10.11648/j.ijmsa.20150404.19

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@article{10.11648/j.ijmsa.20150404.19,
  author = {Sunith Babu L. and H. K. Shivanand},
  title = {Mechanical Characterization of PU Based Sandwich Composites with Variation in Core Density},
  journal = {International Journal of Materials Science and Applications},
  volume = {4},
  number = {4},
  pages = {277-282},
  doi = {10.11648/j.ijmsa.20150404.19},
  url = {https://doi.org/10.11648/j.ijmsa.20150404.19},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijmsa.20150404.19},
  abstract = {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.},
 year = {2015}
}

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