Measuring and Rigidity Moduli of GFRP Experimentally

Q3 Engineering

Open Civil Engineering Journal Pub Date : 2023-08-01 DOI:10.28991/cej-2023-09-08-07

Y. Awad, Ahmed M. El-Fiky, Hosam M. Hegazy, M. G. Hasan, Ibrahim A. Yousef, A. Ebid, M. Khalaf

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引用次数: 0

Abstract

Although GFRP poles are widely accepted today due to their low cost and weight and high electrical and corrosion resistance, they suffer large deformations due to the low elastic and rigidity moduli (E & G) values of the GFRP. Accordingly, it is essential to accurately measure these values to estimate the actual deformation of the pole. This study presented a procedure to measure (E & G) values using three different tests on three sample sizes: full, scale pole, conic sample, and ad coupon sample, instead of using the manufacturer values as usual. This study is also concerned with the shear modulus value and when it can be neglected as usual in other traditional materials. The GRG optimization technique was used to analyze the results and determine the optimum values for (E & G) considering the results of the three tests. The results showed that the values of (E & G) are greatly affected by the sample’s size and shape, the slenderness ratio of the sample (L/r), and the shear deformation contribution. The critical slenderness ratio (L/r), corresponding to a shear deformation contribution of 10%, was determined for each test. This value is recommended as the upper boundary for any test that measures the (E & G) values. Testing several samples with different (L/r) values is also recommended to enhance accuracy. This study was concerned with determining the optimum values of elastic and rigidity moduli for GRFP poles compared to the manufacturer’s conservative values. The results indicated that the shear modulus can be neglected and the importance of the scale effect on the results of flexure and shear modulus. Doi: 10.28991/CEJ-2023-09-08-07 Full Text: PDF

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玻璃钢刚度模量的实验测量

虽然GFRP杆由于其低成本和重量以及高电气和耐腐蚀性而被广泛接受，但由于GFRP的低弹性和刚度模量(E和G)值，它们会遭受很大的变形。因此，准确测量这些值以估计磁极的实际变形是至关重要的。本研究提出了一种测量(E & G)值的程序，使用三种不同的测试来测量三种样本大小:满、刻度杆、圆锥样本和优惠券样本，而不是像往常一样使用制造商的值。本研究还涉及到剪切模量值以及在其他传统材料中通常可以忽略的情况。采用GRG优化技术对试验结果进行分析，并结合3种试验结果确定E和G的最优值。结果表明，(E和G)值受试样尺寸和形状、试样长细比(L/r)和剪切变形贡献的影响较大。每次试验均确定了对应于10%剪切变形贡献的临界长细比(L/r)。建议将此值作为测量(E和G)值的任何测试的上限。还建议使用不同的(L/r)值测试多个样本以提高准确性。本研究关注的是确定GRFP杆的弹性和刚度模量的最佳值，与制造商的保守值相比。结果表明，剪切模量可以忽略不计，尺度效应对挠曲和剪切模量的计算结果具有重要意义。Doi: 10.28991/CEJ-2023-09-08-07全文:PDF

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来源期刊

Open Civil Engineering Journal Engineering-Civil and Structural Engineering

CiteScore

1.90

自引率

0.00%

发文量

期刊介绍： The Open Civil Engineering Journal is an Open Access online journal which publishes research, reviews/mini-reviews, letter articles and guest edited single topic issues in all areas of civil engineering. The Open Civil Engineering Journal, a peer-reviewed journal, is an important and reliable source of current information on developments in civil engineering. The topics covered in the journal include (but not limited to) concrete structures, construction materials, structural mechanics, soil mechanics, foundation engineering, offshore geotechnics, water resources, hydraulics, horology, coastal engineering, river engineering, ocean modeling, fluid-solid-structure interactions, offshore engineering, marine structures, constructional management and other civil engineering relevant areas.