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Effects of blades inside a nozzle on the fiber orientation and distribution in fiber-reinforced cement-based materials

机译:喷嘴内叶片对纤维增强水泥材料纤维取向分布的影响

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摘要

This study developed a nozzle with blades inside called the B-nozzle to improve the fiber orientation and distribution in fiber-reinforced cement-based materials. Numerical simulations were conducted to determine the shape parameters of the B-nozzle while considering the physical interactions between the flow of the cementitious material, the boundaries of the nozzle, and the movement and rotation of the fiber. Based on the shape parameters of the B-nozzle designed from the numerical simulations, experiments were conducted for two sizes of B-nozzles with diameters of 80 and 100 mm to evaluate the influence of the blades on the fiber orientation and distribution. Pouring equipment was also fabricated to maintain the flow direction and initial pressure condition during the tests. The dimensions of the specimen are defined as 130 mm x 130 mm x 260 mm in consideration of the sizes of the fiber and nozzle. A specimen was cut into six pieces to measure the fiber orientation and distribution on the cutting surfaces using image acquisition and processing techniques. Compared to conventional circular nozzles, the B-nozzles increased the mean fiber orientation coefficients by approximately 31-39% and the fiber distribution coefficients by 3-23%.
机译:本研究开发了一种带有叶片的喷嘴,称为B-喷嘴,以改善纤维增强水泥材料中的纤维取向和分布。进行数值模拟以确定B形喷嘴的形状参数,同时考虑水泥材料流动之间的物理相互作用,喷嘴的边界,以及纤维的运动和旋转。基于由数值模拟设计的B喷嘴的形状参数,对直径为80和100mm的两种B形喷嘴进行实验,以评估叶片对纤维取向和分布的影响。还制造浇注设备以在测试期间保持流动方向和初始压力条件。考虑到纤维和喷嘴的尺寸,样本的尺寸定义为130mm×130mm×260mm。将试样切成六片,以使用图像采集和处理技术测量切割表面上的纤维取向和分布。与传统的圆形喷嘴相比,B形喷嘴将平均纤维取向系数增加约31-39%,纤维分布系数升高3-23%。

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