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- 저자 : Mesfin Kebede Kassa (검색결과 2 건)
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Mesfin Kebede Kassa,Rajeshkumar Selvaraj,Ananda Babu Arumugam 한국섬유공학회 2022 Fibers and polymers Vol.23 No.12
This paper presents the progressive failure analysis of carbon nano tubes/polymer/fiber reinforced laminatedcurved composite panels under transverse pressure load distributed over the panel surface for various taper configurations. The ply-by-ply stresses were computed using the finite element method with displacement fields derived based on higherorder shear deformation theory (HSDT). The first ply failure was predicted based on Tsai-Wu failure criterion, and thestiffness degradation method were employed to track post-failure behavior and failure progression. The verification of thecurrent method is performed by comparing the results of the FE analysis with the numerical results available in literature andexperimental tests. Finally, various parametric analysis were performed to investigate the influence of MWCNTsconcentration, taper configurations and curved geometries on the failure characteristics. It was noticed that the failureresistance of the panel significantly enhanced with the addition of CNT filler, regardless of the considered taperconfigurations. It was also noticed that the hyperbolic and cylindrical geometries have the highest and lowest overall stiffnessand strength. It was observed that the taper configuration TC-3 results a higher LPF load among the other taperconfigurations for all the considered curved geometries. Finally, the present work could be used as a guide to study the failurecharacteristics of CNT reinforced laminated tapered curved composite panels, which finds many application in finds manyapplications in windmill, turbine and helicopter blades.
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Tilak Rana,Mesfin Kebede Kassa,Abhishek Shinde,Paul Praveen A,Sushila Chowdhary,Ananda Babu Arumugam 한국섬유공학회 2022 Fibers and polymers Vol.23 No.6
In this study, the elastic properties of the various honeycomb core configurations tailored with MWCNT filledglass fiber reinforced polymer composite materials (GFRP) were investigated numerically using vibration based techniquesand verified with experimental works. The shear properties of GFRP and CNT-GFRP strips corrugated hybrid honeycombcore structures with the influence of Armchair and Zigzag arrangement in CNTs using the vibration analysis have beencarried out along the out of plane with respect to Gxz and Gyz directions. The fabrication of honeycomb core using MWCNTfilled glass fiber reinforced polymer composite materials (GFRP) were prepared with corrugation method after preparing thelamina using vacuum bagging assisted hand layup technique and tested using vibration based techniques for verifying thedeveloped numerical formulation. Finally, the parametric study was carried out to identify the effects of the addition ofvarious different types of CNT; weight percentages of MWCNT, different ply orientations of the fibers, various honeycombconfigurations and honeycomb cell size. It was observed that significant difference is noticed in the shear characteristics ofthe honeycomb with respect to the variations in the parameters considered. Further, it was noticed from the analysis that thehoneycomb structures made by the insertion of strips in various locations of the hexagonal honeycomb cells could yieldhigher shear moduli than that of the conventional honeycomb structure. It can be concluded that the vibration basedtechniques implemented for evaluation the elastic properties of the various honeycomb core configurations tailored withMWCNT filled GFRP composite materials and results extracted could support the designers for developing various cell corewith the addition of MWCNT for the light weight applications such robots, aircraft and automobile applications.
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