Study What Can be Achieved by the Lack of Flexural Strain Energy of Change for The Efficient Recovery of Novolak of The Elasticity As a Result of Fiber-Reinforcement | ||
| Engineering and Technology Journal | ||
| Article 1, Volume 30, Issue 12, July 2012, Pages 284-301 PDF (847.17 K) | ||
| DOI: 10.30684/etj.2012.57265 | ||
| Author | ||
| Rola Abdul Khader Abbas | ||
| Abstract | ||
| This study deals, with the problem of the widening expanse of time to download is not limited to a certain mechanical property of clear-cut, but intertwined and branched out and became one of its aspects scientific insomnia ... Because the total value of creep does not give us a firm base to judge the causes, but under certain circumstances can be separated total distortions for sample into two recoverable deformation and irrecoverable deformation. Therefore, the sum that in order to facilitate the perception of mechanical we need to know the creep resilience modulus and may even add images to unforeseen come to know through the flexural strain energy , which helps to understand this mechanism in order to avoid the dangers arising from the phenomenon of creep. Generally has this study measured the ability of novolak material side by side with the composites prepared reinforcing the novolak material, by glass fiber once and asbestos fibers once and hybrid fibers (30% fiber glass +30% fiber asbestos) again on the absorption of elastic energy which disappear after the removal three – point flexural stress and is know by creep resilience modulus, note that the ratio weighted mount reinforced (60%) and that the samples of various kinds attended with two different ratio from the material hardened (Hexamethylene - teraamine) (HMTA), a percentage (10%) weight once and (14%) and weight again . * The practical results showed that a small fraction absorbed elastic mechanical energy after the first period of time from loading to be non-refundable after the demise of the forces of bending acting on them, and this shows the extent of accumulation of elastic strain energy stored in novolak material over time and raise the value of creep resilience modulus and the consequent decrease of the potential to restore the original situation after removing the stress and thus discouraged the return of this energy absorbed . As a reference this study also to the high elastic strain energy and creep resilience modulus For an article novolak when compared composites as a result of the lack of fiber foregoing in. This is a clear proof on the efficiency of reinforcement mechanism to be strengthened to raise the efficiency of novolak to return the energy bending absorbed, and study also showed that the increase the proportion of material hardened (HMTA) to (14%) lead to the devaluation of resilience modulus which confirms the sharply decreasing the accumulation of elastic strain energy to novolak material and composites, and indicative of, the positive impact of increasing the proportion of material hardened can cancel at least in part the negative impact of this accumulation of elastic strain energy stored in this article prepared to restore elasticity. | ||
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