Determination and Reducing of Curvature from Residual Stresses in Cured Shapes by Using Carbon Nanotubes in Unsymmetric Carbon/Epoxy Laminates

Document Type : Research Article

Authors

University of Kashan

Abstract

In this research, the curvature of cured three-phase un-symmetric cross-ply composite laminates and the effect of carbon nanotubes on it have been studied. The un-symmetric cross-ply composite laminates are including three different phases: carbon fiber, polymer epoxy, and carbon nanotube particles. The different volume fraction of carbon nanotubes as %0, %1, %2 and %3 have been considered in the three-phase un-symmetric cross-ply composite laminate. Different micromechanics models such as Halpin-Tsai, bridging and Schapery models have been used to determine the mechanical and thermal properties. Adding %1 volume fraction of carbon nanotubes leads to decreasing the longitudinal and transverse coefficient thermal expansions and increasing the longitudinal, transverse and shear modulus ones in the composite laminate. Hyer model has been employed to investigate different parameters such as curvature, critical length, and deformed shape in different lengths of square un-symmetric cross-ply laminates. Results show that the addition of 1% volume fraction of carbon nanotubes decreased the critical length and curvature about 9% and 14%, respectively. In addition to Hyer model, the finite element analysis has been used to determine the curvature of the cured un-symmetric cross-ply laminate. The results of finite element analysis and Hyer model have been compared together that showed appropriate conformity and less than 10% error.

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References

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Amirkabir Journal of Mechanical Engineering
Volume 51, Issue 5
November and December 2019
Pages 1107-1018

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