scholarly journals Flexural Strength of Carbon Fiber Reinforced Polymer Repaired Cracked Rectangular Hollow Section Steel Beams

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Tao Chen ◽  
Ming Qi ◽  
Xiang-Lin Gu ◽  
Qian-Qian Yu
Keyword(s):  
Carbon Fiber ◽  
Initial Crack ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Steel Beams ◽  
Fiber Reinforced ◽  
Hollow Section ◽  
Failure Patterns ◽  
Reinforced Polymer ◽  
Cfrp Plate

The flexural behavior of rectangular hollow section (RHS) steel beams with initial crack strengthened externally with carbon fiber reinforced polymer (CFRP) plates was studied. Eight specimens were tested under three-point loading to failure. The experimental program included three beams as control specimens and five beams strengthened with CFRP plates with or without prestressing. The load deflection curves were graphed and failure patterns were observed. The yield loads and ultimate loads with or without repairing were compared together with the strain distributions of the CFRP plate. It was concluded that yield loads of cracked beams could be enhanced with repairing. Meanwhile, the ultimate loads were increased to some extent. The effect of repair became significant with the increase of the initial crack depth. The failure patterns of the repaired specimens were similar to those of the control ones. Mechanical clamping at the CFRP plate ends was necessary to avoid premature peeling between the CFRP plate and the steel beam. The stress levels in CFRP plates were relatively low during the tests. The use of prestressing could improve the utilization efficiency of CFRP plates. It could be concluded that the patching repair could be used to restore the load bearing capacity of the deficient steel beams.

Reconstruction of cracks in a carbon fiber-reinforced polymer laminate plate from signals of eddy current testing

2020 ◽  
Vol 54 (24) ◽  
pp. 3527-3536
Author(s):  
Yali Du ◽  
Xudong Li ◽  
Shejuan Xie ◽  
Shiyou Yang ◽  
Zhenmao Chen
Keyword(s):  
Carbon Fiber ◽  
Eddy Current ◽  
Inverse Analysis ◽  
Eddy Current Testing ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Current Testing ◽  
Reinforced Polymer ◽  
Cfrp Plate

This article aims to study the quantitative eddy current testing of structures of carbon fiber reinforced polymer (CFRP) material; numerical schemes for forward and inverse analysis of eddy current testing signals are proposed and validated for eddy current testing of the CFRP material. At first, an efficient forward solver based on the database approach is updated to treat anisotropic eddy current problem for efficient simulation of the eddy current testing signals due to crack in CFRP material, and an inversion scheme based on the conjugate gradient method is developed using the updated fast forward solver for sizing defect in a CFRP plate. Second, a hybrid inverse analysis scheme is proposed and implemented to improve the sizing accuracy of crack in a CFRP plate using eddy current testing signals of high frequency. Third, eddy current testing signals due to artificial cracks in a CFRP plate are measured and adopted to reconstruct the profile of the cracks. A good agreement between the true and the reconstructed defect sizes demonstrated the validity of both the fast forward solver and the new inversion scheme for sizing defects in the CFRP plate from eddy current testing signals.

Delamination and hole wall roughness evaluation in air-cooled drilling of carbon fiber-reinforced polymer

2021 ◽  
pp. 002199832110092
Author(s):  
Nícholas Hoffmann ◽  
Gabriel SC Souza ◽  
André J Souza ◽  
Volnei Tita
Keyword(s):  
Carbon Fiber ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Process Time ◽  
Air Cooling ◽  
Wall Roughness ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Cfrp Plate ◽  
Carbon Fiber Reinforced

Drilling of carbon fiber-reinforced polymer (CFRP) is widely employed in manufacturing processes in the aeronautical, automobile, and energy industries. The evaluation of the hole region focusing on wall roughness and delamination phenomena is extremely important to predict bolted joints' performance, where at least one of the adherent is a composite material. Thus, this work performed a statistical analysis on the delamination (entrance and exit of the plate) and wall roughness of drilling holes in an 8.6 mm thick CFRP plate carried out by an uncoated carbide drill under compressed air-cooling, varying the cutting speeds and feed rates. Since air-cooling usage combines positive aspects, such as low-cost implementation and shorter process time compared to ultrasonic-assisted drilling, it turns out to be an excellent alternative for aeronautical industry. Thus, the main contribution of the present work consists on analyzing the variation of the delamination in the entrance and exit of the first and tenth holes of a CFRP plate after dry and air-cooled drilling. This variation of the delamination between the cold drill (first hole) and the heated drill due to the drilling holes' sequence (after ten holes) is investigated for 18 different combinations of parameters (runs). For instance, it is shown that if the combination of parameters values is suitable, then it is possible to reduce the mean value of adjusted delamination factor for the entrance of the tenth hole around 11% when comparing cooled-air with dry cutting.

scholarly journals ANALISIS PENGGUNAAN CARBON FIBER REINFORCED PLATE PADA KAPASITAS LENTUR BETON BERTULANG DENGAN METODE ELEMEN HINGGA

2020 ◽  
Vol 3 (2) ◽  
pp. 389
Author(s):  
Alvin Purmawinata ◽  
Edison Leo
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fiber ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Stress And Strain ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Cfrp Plate ◽  
Carbon Fiber Reinforced

Structural strengthening is needed when a structure has degrading servicability, but it is also required  for structures that have changed functions and anticipate due to errors in design and implementation of construction. Strengthening that is popular now is using Carbon Fiber Reinforced Polymer (CFRP). Besides being strong, the installation is very fast and the operation can continue without being interrupted. To analyze the calculation of this structural strengthening, it will refer to ACI 440.2R-17 because Indonesia does not yet have regulations that govern it. Then we need another method to analyze the strengthening of this structure as a comparison, the finite element method. In this research, a bending capacity analysis will be carried out on reinforced concrete beams reinforced with CFRP Plate. Modeling is done by modeling reinforced concrete blocks without strengthening (BT), with reinforcement CFRP Plate (BTF). The result is that the addition of CFRP  plates to reinforced concrete beams can increase the flexural capacity by 103.5% but the deflection decreases by 68.9%. . CFRP Plate used has not reached the optimum strength according to specifications. The maximum stresses on CFRP on BTF beam are only 69.5% of its tensile strength. However, according to the ACI 440.2R-17 calculation, the CFRP stress and strain are also reduced and are not designed based on the stress and strain according to specifications. Stress design of  CFRP  on BTF beam according to the ACI 440.2R-17 calculation is only 38.1% of its tensile strength.AbstrakPerkuatan struktur diperlukan saat struktur sudah mengalami penurunan daya layan,selain itu juga perlu dilakukan untuk struktur yang mengalami perubahan fungsi maupun mengantisipasi akibat kesalahan perancangan maupun pelaksanaan konstruksi.. Perkuatan yang sedang populer kini adalah menggunakan Carbon Fiber Reinforced Polymer (CFRP) . Selain kuat, pemasangannya sangat cepat dan operasional dapat terus berjalan tanpa terganggu. Untuk menganalisis perhitungan perkuatan struktur ini, akan mengacu kepada ACI 440.2R-17 karena Indonesia belum memiliki peraturan yang mengatur. Maka diperlukan metode lain sebagai pembanding yaitu metode elemen hingga. Dalam penelitian ini, akan dilakukan analisis kapasitas lentur terhadap balok beton bertulang yang diberi perkuatan CFRP Plate. Pemodelan dilakukan dengan memodelkan balok beton bertulang tanpa perkuatan (BT) ,dengan perkuatan CFRP Plate (BTF). Hasilnya adalah dengan penambahan CFRP Plate pada balok beton bertulang dapat meningkatkan beban kuat lentur sebesar 103,5 % namun lendutannya turun sebesar 68,9 %. CFRP Plate yang digunakan belum mencapai kekuatan optimum sesuai spesifikasi. Tegangan maksimum pada CFRP pada balok BTF  hanya 69,5% dari kuat tariknya. Akan tetapi, menurut perhitungan ACI 440.2R-17 , tegangan dan regangan CFRP juga direduksi dan tidak didesain berdasarkan tegangan dan regangan sesuai spesifikasi. Tegangan CFRP desain pada balok BTF menurut perhitungan ACI 440.2R-17 hanya 38,1% dari kuat tariknya.

scholarly journals Balok Beton Bertulang yang Diperkuat dengan Carbon Fiber Reinforced Polymer Wrap saat Dibebani Beban Gravitasi

2021 ◽  
Vol 17 (1) ◽  
pp. 1-10
Author(s):  
Brian Widyan Hadi ◽  
Henricus Priyosulistyo ◽  
Muhammad Fauzie Siswanto
Keyword(s):  
Carbon Fiber ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Optimal Method ◽  
Flexural Strengthening ◽  
Failure Patterns ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced ◽  
Strength And Stiffness

ABSTRACTInnovation is developed continuously to find an optimal method of strengthening structural components. There are many strengthening methods for reinforced concrete structures. Carbon Fiber Reinforced Polymer Wrap as a flexural strengthening material according to ACI 440.2R was chosen. The research includes gravity load (dead load and live load) as the initial load during test according to SNI 2847-2013 chapter 20. This research examines the strength of the intact beam, strengthened reinforced beam, and failure pattern, respectively, compared to the intact beam's result theoretically and experimentally. The failure test results show that the maximum loads of the experiment beam were similar to the theoretical analysis with a ratio of 0.98 to 1.33. The failure patterns are shear, flexure-shear, spalling and diagonal cracks, and debonding failures. CFRPW can increase the strength and stiffness of the beams. The increase of CFRP beams (BF A and BF B) is 35,27% and 46,24%, respectively. The increase of stiffness ratio of BF A and BF B is 3,48 and 6,62 compared to BK 1. ABSTRAKSebuah inovasi yang terus dikembangkan agar menemukan sebuah metode yang optimal dalam perkuatan komponen struktur balok. Perkuatan balok beton bertulang dapat dilakukan dalam beberapa metode. Carbon Fiber Reinforced Polymer Wrap dipilih sebagai bahan penguat lentur sesuai ACI 440.2R. Penelitian ini meliputi beban gravitasi (beban mati dan beban hidup) sebagai beban awal pada saat pengujian sesuai SNI 2847-2013 pasal 20. Penelitian ini mengkaji kekuatan balok murni, kekuatan balok yang telah diperkuat, pola keruntuhan dan perbandingan antara hasil teoritis dan eksperimental. Hasil pengujian ultimit menunjukkan bahwa balok uji serupa dengan analisis teoritis dengan perbandingan beban maksimum 0,98 dan 1,33. Pola kegagalan adalah retak geser, geser lentur, keretakan spalling dan diagonal serta kegagalan debounding. CFRPW dapat meningkatkan kekuatan dan kekakuan balok. Peningkatan kekuatan BF A 35,27% dan BF B 46,24% terhadap BK 1. Peningkatan rasio kekakuan balok BF A dan BF B bila dibandingkan dengan BK 1 adalah 3,48 dan 6,62.

scholarly journals The Impact of the HMCFRP Ratio on the Strengthening of Steel Composite I-Beams

2012 ◽  
Vol 2012 ◽  
pp. 1-13 ◽  
Author(s):  
E. Agcakoca ◽  
M. Aktas
Keyword(s):  
Finite Element ◽  
Carbon Fiber ◽  
Polymer Materials ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Steel Beams ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced ◽  
The Impact

Carbon fiber-reinforced polymer materials have become popular in the construction industry during the last decade for their ability to strengthen and retrofit concrete structures. The recent availability of high-modulus carbon fiber-reinforced polymer strips (HMCFRP) has opened up the possibility of using this material in strengthening steel structures as well. The strips can be used in steel bridge girders and structures that are at risk of corrosion-induced cross-sectional losses, structural deterioration from aging, or changes in function. In this study, a set of bending experiments was performed on three types of steel beams reinforced with HMCFRP. The results were used to enhance a nonlinear finite element model built with ABAQUS software. The accuracy of the mathematical models for HMCFRP, epoxy, and steel profiles was compared with the experimental results, and the ability of HMCFRP to continue carrying load from the steel beams during rupture and postrupture scenarios was observed using numerical analysis. Using these verified finite element models, a parametric analysis was performed on the HMCFRP failure modes and the quantity to be used with IPE profile steel beams. The maximum amount of HMCFRP needed for strengthening was determined, and an upper limit for its use was calculated to avoid any debonding failure of the fiber material.

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