Volume 12, Issue 4 (11-2012)
Modares Mechanical Engineering 2012, 12(4): 147-155 |
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A novel method to decrease macro-residual stresses of laminated composites by adding carbon nano-fibers. Modares Mechanical Engineering 2012; 12 (4) :147-155
URL: http://mme.modares.ac.ir/article-15-12399-en.html
URL: http://mme.modares.ac.ir/article-15-12399-en.html
Abstract: (5889 Views)
In this research, a novel method to decrease macro-residual stresses of laminated composites by adding carbon nano-fiber (CNF) is proposed. To this end, using micromechanical and modified micromechanical approaches, coefficient of thermal expansion (CTE) and Young’s modulus of carbon nano-fiber reinforced polymer are calculated. Then using this enhanced matrix, longitudinal and transverse of thermal expansion and Young’s modulus of a CNF/glass/epoxy unidirectional lamina in presence of CNF are obtained. Finally, using the classical lamination theory (CLT), macro-residual stresses for CNF/glass/epoxy laminated composites are obtained. The results explain how CNF can result in reducing macro-residual stresses in nano particle filled laminated composites. The results for both cross ply and angle ply glass/epoxy laminated composites are presented and show that adding CNF through the matrix can decrease macro-residual stresses in each plies up to about 30%. The main reason for the decrease in residual stresses are due to the sever decrease of coefficient of thermal expansion of the unidirectional ply.
Keywords: young’s modulus, Polymeric composites, Carbon nano-fiber, Macro-residual stress, Coefficient of thermal expansion
Received: 2012/01/5 | Accepted: 2012/04/14 | Published: 2012/10/1
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