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Yiwei Xia, Xiaoping Li, Yu Peng, Mianheng Lai, Lu Wang
In recent years, load-bearing exterior sandwich wall boards have been adopted in civil engineering. The exterior walls of structures are often exposed to low velocity impacts such as stones, tools, and windborne debris, etc. The ultimate loading capacity, deformation, and ductility of sandwich walls are weakened by impact loads. In this study, the sandwich wall boards consisted of glass fiber reinforced plastic (GFRP) face sheets and a web-foam core. The core of wall boards was not the isotropic material. There was no doubt that the mechanical performance was seriously influenced by the impact locations...
September 13, 2018: Materials
Kai Xu, Changchun Ren, Qingshan Deng, Qingping Jin, Xuemin Chen
Glass fiber-reinforced polymers (GFRPs) have received increasing attention in recent years due to their overall performance of light weight, low cost and corrosion resistance, and they are increasingly used as reinforcement in concrete structures. However, GFRP material has low elastic modulus and linear elastic properties compared with steel bars, which introduces different bonding characteristics between bars and concrete. Therefore, a reliable monitoring method is urgently needed to detect the bond slip in GFRP-reinforced concrete structures...
August 13, 2018: Sensors
Anne Ducassou, Laetitia Padovani, Leonor Chaltiel, Stéphanie Bolle, Jean-Louis Habrand, Line Claude, Christian Carrie, Xavier Muracciole, Bernard Coche-Dequeant, Claire Alapetite, Stéphane Supiot, Charlotte Demoor-Goldschmidt, Valerie Bernier-Chastagner, Aymeri Huchet, Julie Leseur, Elisabeth Le Prise, Christine Kerr, Gilles Truc, Tan Dat Nguyen, Anne-Isabelle Bertozzi, Didier Frappaz, Sergio Boetto, Annick Sevely, Fatima Tensaouti, Anne Laprie
PURPOSE: The objective of this study was to analyze survival and prognostic factors for children, adolescents, and young adults treated with postoperative radiation therapy (RT) for intracranial ependymoma. METHODS AND MATERIALS: Between 2000 and 2013, 202 patients aged ≤25 years were treated in the 13 main French pediatric RT reference centers. Their medical records were reviewed for information, treatments received, and survival rates. All children had received postoperative RT- conformal, intensity modulated, or proton beam...
September 1, 2018: International Journal of Radiation Oncology, Biology, Physics
Monica J Emerson, Vedrana A Dahl, Knut Conradsen, Lars P Mikkelsen, Anders B Dahl
A unidirectional (UD) glass fibre reinforced polymer (GFRP) composite was scanned at varying resolutions in the micro-scale with several imaging modalities. All six scans capture the same region of the sample, containing well-aligned fibres inside a UD load-carrying bundle. Two scans of the cross-sectional surface of the bundle were acquired at a high resolution, by means of scanning electron microscopy (SEM) and optical microscopy (OM), and four volumetric scans were acquired through X-ray computed tomography (CT) at different resolutions...
June 2018: Data in Brief
Lamia Heikal, Anna Starr, Dania Hussein, Jesus Prieto-Lloret, Phil Aaronson, Lea Ann Dailey, Manasi Nandi
Reduced nitric oxide (NO) bioavailability correlates with impaired cardiovascular function. NO is extremely labile and has been challenging to develop as a therapeutic agent. However, NO bioavailability could be enhanced by pharmacologically targeting endogenous NO regulatory pathways. Tetrahydrobiopterin, an essential cofactor for NO production, is synthesized by GTP cyclohydrolase-1 (GCH1), which complexes with GCH1 feedback regulatory protein (GFRP). The dietary amino acid l-phenylalanine activates this complex, elevating vascular BH4 ...
June 2018: JACC. Basic to Translational Science
Saurabh Gupta, Prabhu Rajagopal
This paper studies the interaction of the fundamental symmetric Lamb wave mode S0 with delaminations in 8-layered glass fibre reinforced polymer (GFRP) laminated composites, using numerical models validated against experiments. The validation is performed using experiments on the eight layer quasi-isotropic GFRP composite laminate [0/90/45/-45]S . Further numerical studies were performed on the laminates [0/45/-45/90]S, [0/45/90/-45]S, [90/45/-45/0]S, [90/-45/0/45]S, [45/-45/0/90]S, and [45/90/-45/0]S to study the effect of ply layups on the reflection of S0 Lamb waves...
November 2018: Ultrasonics
Guanghui Li, Jun Zhao, Zike Wang
Fiber-reinforced polymer (FRP) bars have been widely applied in civil engineering. This paper presents the results of an experimental study to investigate the tensile fatigue mechanical properties of glass fiber-reinforced polymer (GFRP) bars after elevated temperatures exposure. For this purpose, a total of 105 GFRP bars were conducted for testing. The specimens were exposed to heating regimes of 100, 150, 200, 250, 300 and 350 °C for a period of 0, 1 or 2 h. The GFRP bars were tested with different times of cyclic load after elevated temperatures exposure...
June 16, 2018: Materials
Daniel Teufl, Swen Zaremba
During the production of fiber-reinforced composite materials, liquid resin is introduced into the fiber material and cured, i.e., hardened. An elevated temperature is needed for this curing. Microwave curing of composites has been investigated for some time, but it has mostly been done using small domestic or laboratory equipment. However, no investigation has been carried out using an industrial-sized chamber-microwave for glass fiber-reinforced plastic (GFRP). Here, we show that microwave curing produces laminates of the same quality as oven-cured ones...
May 18, 2018: Materials
Michal Dziendzikowski, Patryk Niedbala, Artur Kurnyta, Kamil Kowalczyk, Krzysztof Dragan
One of the ideas for development of Structural Health Monitoring (SHM) systems is based on excitation of elastic waves by a network of PZT piezoelectric transducers integrated with the structure. In the paper, a variant of the so-called Transfer Impedance (TI) approach to SHM is followed. Signal characteristics, called the Damage Indices (DIs), were proposed for data presentation and analysis. The idea underlying the definition of DIs was to maintain most of the information carried by the voltage induced on PZT sensors by elastic waves...
May 11, 2018: Sensors
João Vitor de Queiroz, José Cavalcante Souza Vieira, Grasieli de Oliveira, Camila Pereira Braga, Izabela da Cunha Bataglioli, Janaína Macedo da Silva, Wellington Luiz de Paula Araújo, Pedro de Magalhães Padilha
Predator fish can accumulate high levels of mercury, which qualifies them as potential indicators of this toxic metal. The predatory species Brachyplatystoma filamentosum, popularly known as filhote, is among the most consumed species in the Brazilian Amazon. Continuing the metalloproteomic studies of mercury in Amazonian fishes that have been developed in the last 5 years, the present paper provides the data of protein characterization associated with mercury in muscle and liver samples of filhote (Brachyplatystoma filamentosum) collected in the Madeira River, Brazilian Amazon...
May 8, 2018: Biological Trace Element Research
Peiyu Wang, Zhencheng Li, Yongmao Pei
An in situ high temperature microwave microscope was built for detecting surface and sub-subsurface structures and defects. This system was heated with a self-designed quartz lamp radiation module, which is capable of heating to 800°C. A line scanning of a metal grating showed a super resolution of 0.5 mm (λ/600) at 1 GHz. In situ scanning detections of surface hole defects on an aluminium plate and a glass fiber reinforced plastic (GFRP) plate were conducted at different high temperatures. A post processing algorithm was proposed to remove the background noises induced by high temperatures and the 3...
April 16, 2018: Optics Express
Tanja Scherer, Gabriella Allegri, Christineh N Sarkissian, Ming Ying, Hiu Man Grisch-Chan, Anahita Rassi, Shelley R Winn, Cary O Harding, Aurora Martinez, Beat Thöny
Hyperphenylalaninemia (HPA) caused by hepatic phenylalanine hydroxylase (PAH) deficiency has severe consequences on brain monoamine neurotransmitter metabolism. We have studied monoamine neurotransmitter status and the effect of tetrahydrobiopterin (BH4 ) treatment in Pahenu1/enu2 (ENU1/2) mice, a model of partial PAH deficiency. These mice exhibit elevated blood L-phenylalanine (L-Phe) concentrations similar to that of mild hyperphenylalaninemia (HPA), but brain levels of L-Phe are still ~5-fold elevated compared to wild-type...
July 2018: Journal of Inherited Metabolic Disease
Devon S Ellis, Habib Tabatabai, Azam Nabizadeh
The use of fiber reinforced polymer (FRP) bars in reinforced concrete members enhances corrosion resistance when compared to traditional steel reinforcing bars. Although there is ample research available on the behavior of FRP bars and concrete members reinforced with FRP bars under elevated temperatures (due to fire), there is little published information available on their post-fire residual load capacity. This paper reports residual tensile strength, modulus of elasticity, and bond strength (to concrete) of glass fiber reinforced polymer (GFRP) bars after exposure to elevated temperatures of up to 400 °C and subsequent cooling to an ambient temperature...
February 27, 2018: Materials
Fang Xie, Ju Chen, Xinlong Dong, Bing Feng
Experimental investigation of GFRP (glass fiber reinforced polymer) tubes that were filled with magnetically driven concrete was carried out to study the flexural behavior of specimens under bending. Specimens having different cross section and lengths were tested. The test specimens were fabricated by filling magnetically driven concrete into the GFRP tubes and the concrete was vibrated using magnetic force. Specimens vibrated using vibrating tube were also tested for comparison. In addition, specimens having steel reinforcing bars and GFRP bars were both tested to study the effect of reinforcing bars on the magnetically driven concrete...
January 8, 2018: Materials
Kumar Anubhav Tiwari, Renaldas Raisutis, Vykintas Samaitis
This work proposes a novel hybrid signal processing technique to extract information on disbond-type defects from a single B-scan in the process of non-destructive testing (NDT) of glass fiber reinforced plastic (GFRP) material using ultrasonic guided waves (GW). The selected GFRP sample has been a segment of wind turbine blade, which possessed an aerodynamic shape. Two disbond type defects having diameters of 15 mm and 25 mm were artificially constructed on its trailing edge. The experiment has been performed using the low-frequency ultrasonic system developed at the Ultrasound Institute of Kaunas University of Technology and only one side of the sample was accessed...
December 9, 2017: Sensors
Amin Haghbin, Gholamhossein Liaghat, Homayoun Hadavinia, Amir Masoud Arabi, Mohammad Hossein Pol
In this work, an electrophoretic deposition (EPD) technique has been used for deposition of carbon nanotubes (CNTs) on the surface of glass fiber textures (GTs) to increase the volume conductivity and the interlaminar shear strength (ILSS) of CNT/glass fiber-reinforced polymers (GFRPs) composites. Comprehensive experimental studies have been conducted to establish the influence of electric field strength, CNT concentration in EPD suspension, surface quality of GTs, and process duration on the quality of deposited CNT layers...
September 22, 2017: Materials
Mateusz Koziol, Tomasz Figlus
The work aimed to assess the failure progress in a glass fiber-reinforced polymer laminate with a 3D-woven and (as a comparison) plain-woven reinforcement, during static bending, using acoustic emission signals. The innovative method of the separation of the signal coming from the fiber fracture and the one coming from the matrix fracture with the use of the acoustic event's energy as a criterion was applied. The failure progress during static bending was alternatively analyzed by evaluation of the vibration signal...
December 14, 2015: Materials
Insub Choi, JunHee Kim, Ho-Ryong Kim
A full-scale experimental test was conducted to analyze the composite behavior of insulated concrete sandwich wall panels (ICSWPs) subjected to wind pressure and suction. The experimental program was composed of three groups of ICSWP specimens, each with a different type of insulation and number of glass-fiber-reinforced polymer (GFRP) shear grids. The degree of composite action of each specimen was analyzed according to the load direction, type of the insulation, and number of GFRP shear grids by comparing the theoretical and experimental values...
March 19, 2015: Materials
JunHee Kim, Young-Chan You
A full-scale experimental program was used in this study to investigate the structural behavior of novel insulated concrete sandwich wall panels (SWPs) reinforced with grid-type glass-fiber-reinforced polymer (GFRP) shear connectors. Two kinds of insulation-expanded polystyrene (EPS) and extruded polystyrene (XPS) with 100 mm thickness were incased between the two concrete wythes to meet the increasing demand for the insulation performance of building envelope. One to four GFRP shear grids were used to examine the degree of composite action of the two concrete wythes...
March 3, 2015: Materials
Luca Righetti, Vikki Edmondson, Marco Corradi, Antonio Borri
Fiber-reinforced composite (FRP) materials have gained an increasing success, mostly for strengthening, retrofitting and repair of existing historic masonry structures and may cause a significant enhancement of the mechanical properties of the reinforced members. This article summarizes the results of previous experimental activities aimed at investigating the effectiveness of GFRP (Glass Fiber Reinforced Polymers) grids embedded into an inorganic mortar to reinforce historic masonry. The paper also presents innovative results on the relationship between the durability and the governing material properties of GFRP grids...
July 21, 2016: Materials
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