Creep Behavior of Fiber Reinforced Polymer

Topics: Composite material, Fiberglass, Epoxy Pages: 9 (2416 words) Published: September 6, 2013
epEng. & Tech. Journal, Vol.28, No.7, 2010

The Effect of Fiber Orientation on Creep Behavior And Flextural Strength In Epoxy Composites Dr. Emad S. AL-Hassani * &
Abstract The creep behavior, flexural strength, shear stress was investigated in this paper for epoxy, epoxy composite reinforced with glass fibers: (chopped strand mat), woven roven (90о-0о) and chopped strand mat together as a sandwich composite with volume fraction (21, 25, 29) % for each type. The tests were done at constant temperature (room temperature (23 ± 2) оC. The results shown that the increasing in volume fraction increases the creep behavior, flextural strength, shear stress for all samples also the results shown the effect of fiber orientation in increasing the creep behavior, flextural strength, shear stress in sandwich composites in comparession with the composites reinforced with randomly glass fibers.

Sheelan R. Areef**

Received on:30/8/2009 Accepted on:7/1/2010

‫ﺘﺄﺜﻴﺭ ﺍﺘﺠﺎﻩ ﺍﻻﻟﻴﺎﻑ ﻋﻠﻰ ﺨﺎﺼﻴﺔ ﺍﻟﺯﺤﻑ ﻭﻤﺘﺎﻨﺔ ﺍﻻﻨﺤﻨﺎﺀ ﻟﻤﺘﺭﺍﻜﺒﺎﺕ ﺍﻻﻴﺒﻭﻜﺴﻲ‬ ‫ﺍﻟﺨﻼﺼﺔ‬ ,‫ﺘﻡ ﻓﻲ ﻫﺫﺍ ﺍﻟﺒﺤﺙ ﺩﺭﺍﺴﺔ ﺴﻠﻭﻙ ﺍﻟﺯﺤﻑ, ﻤﺘﺎﻨﺔ ﺍﻻﻨﺤﻨﺎﺀ, ﺍﺠﻬـﺎﺩ ﺍﻟﻘـﺹ ﻟـﺭﺍﺘﻨﺞ ﺍﻻﻴﺒﻭﻜﺴـﻲ‬ ‫ﻤﺘﺭﺍﻜﺒﺎﺕ ﺍﻷﻴﺒﻭﻜﺴﻲ ﺍﻟﻤﺩﻋﻤﺔ ﺒﺎﻻﻟﻴﺎﻑ ﺍﻟﺯﺠﺎﺠﻴﺔ: ﺤﺼﻴﺭﺓ ﻤﺤﺎﻜﺔ ﻋﺸﻭﺍﺌﻴﺎ ﻭ ﺤﺼﻴﺭﺓ ﻤﺘﻌﺎﻤﺩﺓ ﺍﻻﺘﺠﺎﻩ‬ % (21, 25, 29 ) ‫09( ﻭﺍﻟﻌﺸﻭﺍﺌﻴﺔ ﺍﻷﺘﺠﺎﻩ ﻤﻌﺎﹰ ﺒﺸﻜل ﻤﺘﺭﺍﻜﺏ ﻤﺘﻭﺍﻟﻑ ﻭﺒﻜﺴﺭ ﺤﺠﻤﻲ ﻤﻘﺩﺍﺭﻩ‬о-0о) (23 ± 2) оC ‫ﻟﻜﻼ ﺍﻟﻨﻭﻋﻴﻥ. ﺘﻡ ﺍﺠﺭﺍﺀ ﺍﻻﺨﺘﺒﺎﺭﺍﺕ ﺒﺩﺭﺠﺔ ﺤﺭﺍﺭﻴﺔ ﺜﺎﺒﺘﺔ ﻭﻫﻲ ﺩﺭﺠﺔ ﺤﺭﺍﺭﺓ ﺍﻟﻐﺭﻓﺔ‬ ‫ﺃﻅﻬﺭﺕ ﺍﻟﻨﺘﺎﺌﺞ ﺍﻥ ﺯﻴﺎﺩﺓ ﺍﻟﻜﺴﺭ ﺍﻟﺤﺠﻤﻲ ﻴﺯﻴﺩ ﻤﻥ ﺴﻠﻭﻙ ﺍﻟﺯﺤﻑ, ﻤﺘﺎﻨﺔ ﺍﻷﻨﺤﻨﺎﺀ, ﺍﺠﻬﺎﺩ ﺍﻟﻘﺹ ﻟﻠﻌﻴﻨﺎﺕ‬ ‫ﻜﺎﻓﺔ ﻜﻤﺎ ﺃﻅﻬﺭﺕ ﺍﻟﻨﺘﺎﺌﺞ ﺘﺄﺜﻴﺭ ﺍﺘﺠﺎﻩ ﺍﻷﻟﻴﺎﻑ ﻓﻲ ﺍﺯﺩﻴﺎﺩ ﺴﻠﻭﻙ ﺍﻟﺯﺤﻑ ﻭﻤﺘﺎﻨﺔ ﺍﻻﻨﺤﻨﺎﺀ ﻭﺍﺠﻬﺎﺩ ﺍﻟﻘـﺹ‬ ‫ﻟﻠﻌﻴﻨﺎﺕ ﺍﻟﻤﺩﻋﻤﺔ ﺒﺎﻷﻟﻴﺎﻑ ﺍﻟﺯﺠﺎﺠﻴﺔ ﺍﻟﻤﺘﻭﺍﻟﻔﺔ ﻤﻘﺎﺭﻨﺔ ﺒﺎﻟﻌﻴﻨﺎﺕ ﺍﻟﻤﺩﻋﻤﺔ ﺒﺎﻷﻟﻴﺎﻑ ﺍﻟﺯﺠﺎﺠﻴﺔ ﺍﻟﻌﺸـﻭﺍﺌﻴﺔ‬ .‫ﺍﻻﺘﺠﺎﻩ‬ Introduction A composite may be defined as any multiple phase material that exhibits a significant proportion of the properties of both the constituent materials, a judicious combination of two or more distinct materials can provide better combination of properties. Fiber reinforced composites are those composites in which the dispersed phase is in the form of fibers, technologically, these composites are very important as they provide high strength and stiffness on a weight basis [1] . Many researchers studied in this field, Balkees [2] showed that the orientation of fibers had a major role in increasing the creep resistance according to applied load,

* Materials Engineering Department, University of Technology /Baghdad **Applied Sciences Department, University of Technology /Baghdad 1281

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Eng. & Tech. Journal, Vol.28, No.7, 2010

The Effect of Fiber Orientation on Creep Behavior And Flexural Strength In Epoxy Composites

microstructure of the composite, and adhesion between the resin and the fibers. Papanico laou [3] gave an excellent review for damage development in polymeric materials which is completely different from the respective one of metals, leading to complex damage mechanisms such as fiber breakage, matrix cracking, fiber debonding and ply- delamination, addition all the damages appears not only in different types, but also in different levels and location, which have different effects on the residual life of a composite structure. Houshyar [4] gave that the incorporation and increase of the fiber concentration gave rise to a considerable increase of tensile, flexural strength, the maximum improvement in properties was observed for the composite with W = f 50% which is equal to Vf = 26%, is chosen as a critical fiber concentration, this was due to the reinforcement imparted by the fibers that allowed stress transfer from the matrix to the fibers. Lee & Jyongsik [5] reported that as fiber content increased, the tensile and flextural modulus of the glass fiber composite showed a linear increment. Another study by Abot & Yasmin [6] showed that the interface region between the matrix and glass fibers limited the mechanical properties of the composite. Amorphous materials such as high...

References: Eng. & Tech. Journal, Vol.28, No.7, 2010
The Effect of Fiber Orientation on Creep Behavior And Flexural Strength In Epoxy Composites
Eng. & Tech. Journal, Vol.28, No.7, 2010
The Effect of Fiber Orientation on Creep Behavior And Flexural Strength In Epoxy Composites
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