Rola Abdul Khader Abbas
Abstract
This study deals, with the problem of the widening expanse of time to downloadis not limited to a certain mechanical property of clear-cut, but intertwined andbranched out and became ...
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This study deals, with the problem of the widening expanse of time to downloadis not limited to a certain mechanical property of clear-cut, but intertwined andbranched out and became one of its aspects scientific insomnia ... Because the totalvalue of creep does not give us a firm base to judge the causes, but under certaincircumstances can be separated total distortions for sample into two recoverabledeformation and irrecoverable deformation. Therefore, the sum that in order tofacilitate the perception of mechanical we need to know the creep resiliencemodulus and may even add images to unforeseen come to know through the flexuralstrain energy , which helps to understand this mechanism in order to avoid thedangers arising from the phenomenon of creep.Generally has this study measured the ability of novolak material side by side withthe composites prepared reinforcing the novolak material, by glass fiber once andasbestos fibers once and hybrid fibers (30% fiber glass +30% fiber asbestos) again onthe absorption of elastic energy which disappear after the removal three – pointflexural stress and is know by creep resilience modulus, note that the ratio weightedmount reinforced (60%) and that the samples of various kinds attended with twodifferent ratio from the material hardened (Hexamethylene - teraamine) (HMTA), apercentage (10%) weight once and (14%) and weight again .* The practical results showed that a small fraction absorbed elastic mechanicalenergy after the first period of time from loading to be non-refundable after thedemise of the forces of bending acting on them, and this shows the extent ofaccumulation of elastic strain energy stored in novolak material over time and raisethe value of creep resilience modulus and the consequent decrease of the potential torestore the original situation after removing the stress and thus discouraged the returnof this energy absorbed .As a reference this study also to the high elastic strain energy and creep resiliencemodulus For an article novolak when compared composites as a result of the lack offiber foregoing in. This is a clear proof on the efficiency of reinforcement mechanismto be strengthened to raise the efficiency of novolak to return the energy bendingabsorbed, and study also showed that the increase the proportion of material hardened(HMTA) to (14%) lead to the devaluation of resilience modulus which confirms thesharply decreasing the accumulation of elastic strain energy to novolak material and composites, and indicative of, the positive impact of increasing the proportion ofmaterial hardened can cancel at least in part the negative impact of thisaccumulation of elastic strain energy stored in this article prepared to restoreelasticity.
