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Mechanical and thermal characterization ofudthe filament wound composites forudconstruction

机译:ud的机械和热学表征用于 n的纤维缠绕复合材料施工

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摘要

Properties of fiber reinforced composites (FRP) arise as a function of its constituent materials, their distribution, and the interaction among them and as a result of it an unusual combination of material properties can be obtained. There are various methods of their manufacturing, but filament winding is a very important and widely used technique for FRP production related to civil engineering. The basis of this technology includes winding of resin-impregnated fibers into a tool and hardening of the wound structure. This technology enables the fibers to be placed into the direction of the load that may be expected during exploitation of construction elements. By varying the winding angle with respect to the mandrel axis, directional strength can be obtained by the loads, which will operate on the finished product. It is essential to know the mechanical and thermal characteristics of filament wound tubes in order to employ them in design applications.udThe focus of this stay was to investigate the mechanical and thermal properties of different glass fiber reinforced composite pipes produced by filament winding technique. So, the research program of the STSM was divided into two tasks. The first one refers to the mechanical characterization, and the second one to the thermal characterization of the epoxy resin and filament wound pipes.udBased on the investigation in the fame of this STSM, it can be concluded that from the mechanical point of view there are significant differences in the filament wound pipes with different fiber orientation. Regarding the tensile properties, the bigger winding angle lead to higher hoop tensile properties of filament-wound tubular samples. But, for the transverse compression properties of composite specimens the lower winding angle lead to higher transverse compression properties of the samples. The optimal mechanical properties have the samples on the primary level winded with angle 450. It was noticed a slight influence of the fiber tension but the velocity of the filament winding doesn’t influence on the mechanical properties of the specimens.udFrom the results of thermal characterization, it can be concluded that all filament wound pipes have a good thermal stability and their weight loss was observed at temperature interval from 600 oC to 1000 oC. Based on the measurements for the glass transition and rate of cure, it can be concluded that crosslinking reaction between the resin and fibers in the filament wound pipes is already reached in all composites.
机译:纤维增强复合材料(FRP)的性能取决于其组成材料,其分布以及它们之间的相互作用,因此,可以获得材料性能的异常组合。它们的制造方法多种多样,但是对于与土木工程相关的FRP生产,纤维缠绕是非常重要且广泛使用的技术。该技术的基础包括将树脂浸渍的纤维缠绕到工具中,并使缠绕的结构硬化。这项技术使纤维可以在建筑构件开发过程中预期的载荷方向上放置。通过改变相对于心轴轴线的缠绕角度,可以通过载荷获得方向强度,该载荷将作用于成品。为了将其用于设计应用中,必须知道细丝缠绕管的机械和热学特性。 ud此研究的重点是研究通过细丝缠绕技术生产的不同玻璃纤维增​​强复合管的机械和热学性能。因此,STSM的研究计划分为两个任务。第一个是指环氧树脂和长丝缠绕管的机械特性,第二个是指环氧树脂和长丝缠绕管的热特性。 ud基于对这种STSM的名声的调查,可以得出结论,从机械的角度来看纤维取向不同的长丝缠绕管之间存在显着差异。关于拉伸性能,较大的缠绕角导致细丝缠绕的管状样品的更高的环向拉伸性能。但是,对于复合样品的横向压缩特性,较低的缠绕角导致样品的较高的横向压缩特性。最佳的机械性能使样品在初级水平上以450°的角度缠绕。注意到纤维张力的影响很小,但是细丝缠绕的速度对样品的机械性能没有影响。通过热特性,可以得出结论,所有细丝缠绕管都具有良好的热稳定性,并且在600 oC至1000 oC的温度区间观察到了重量损失。基于玻璃化转变和固化速率的测量结果,可以得出结论,在所有复合材料中,长丝缠绕管中的树脂和纤维之间已经发生交联反应。

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    Srebrenkoska Vineta;

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  • 年度 2015
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