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  • Open Access


    An Experimental Study on the Reinforcement of Weakly-Consolidated Shallow Formation in Deep Water Using an Epoxy Resin-Based Fluid

    Leiju Tian1, Yuhuan Bu1,*, Huajie Liu1,*, Lingyun Zhao2,3

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.5, pp. 1215-1226, 2023, DOI:10.32604/fdmp.2022.022219

    Abstract The mechanical properties of Portland cement differ from the weakly consolidated shallow formation in deep water. This results in undesired abrupt changes in the compressive strength and elastic modulus at the cement–formation interface. In this study, a water-borne epoxy resin was applied as a strengthening material to reinforce the weakly consolidated shallow formation and protect the cement sheath from potential failure. The mechanical properties of the unconsolidated clay were tested, including their changes with increases in the temperature and curing time. In addition, the effects of the seawater, cement slurry alkaline filtrate, and saltwater drilling More >

  • Open Access


    Experimental Study of Moso Bamboo to-Steel Connections with Embedded Grouting Materials

    Shidong Nie1,2, Wei Fu1,2, Hui Wang1,2,*, Di Wu1,2,3, Min Liu1,2, Junlong Wang4

    Journal of Renewable Materials, Vol.11, No.3, pp. 1401-1423, 2023, DOI:10.32604/jrm.2022.023446

    Abstract Moso bamboos have attracted excessive attention as a renewable green building material to the concept of sustainable development. In this paper, the 20 bolted Moso bamboo connection specimens with embedded steel plates and grouting materials were designed according to connection configurations with different bolt diameters and end distance of bolt holes, and their bearing capacities and failure modes were analyzed by static tension tests. According to the test results of all connectors, the failure modes of the specimens are divided into four categories, and the effects of bolt diameter and bolt hole end distance on More >

  • Open Access


    An Experimental Study of Composite Columns Filled with Eucalyptus nitens Timber under Axial Compression

    Yingyao Cheng1,2, Xudong Chen3, Huaming An1,*, Huimin Wang2,4, Kai Tao2,5

    Journal of Renewable Materials, Vol.11, No.2, pp. 825-836, 2023, DOI:10.32604/jrm.2022.022599

    Abstract Eucalyptus nitens (E. nitens) has been much used for producing paper but also shows promise for structural applications. In this study, static compressive tests were undertaken to examine its suitability to be used in an innovative composite column. The composite column was comprised of a rectangular steel tube with E. nitens timber infill. The nonlinear compressive behaviour of the composite column filled with E. nitens wood for both dry and wet conditions was examined. The same tests on rectangular steel tubes and bare dry and wet E. nitens samples were also undertaken as a comparison. For samples with different conditions, More > Graphic Abstract

    An Experimental Study of Composite Columns Filled with <i>Eucalyptus nitens</i> Timber under Axial Compression

  • Open Access


    An Experimental Study on the Performance of a Hybrid Photovoltaic/Thermal Solar System

    Xin Xu1,*, Lian Zhang1,2,*

    Energy Engineering, Vol.119, No.6, pp. 2319-2345, 2022, DOI:10.32604/ee.2022.022457

    Abstract Considered as the widespread renewable energy, solar energy is used to produce the electricity and heat for carbon peaking and carbon neutralization. However, the photo-electric conversion efficiency will decrease with the increase of cells temperature. To solve this problem, a water-type hybrid photovoltaic/thermal (PV/T) solar system has been designed and tested in Hong Kong. The outdoor experiment proceeded all days in 6 months with three different operating modes. The data of selected 33 days were used to analyze the performance of the system. The results showed that the thermal efficiencies were 33.6%, 52%, and 48.3%… More >

  • Open Access


    Flow Structure and Short-Term Riverbed Evolution in Curved Flumes

    Shuxian Gao1, Yonggang Cao2,*, Yuchuan Bai3, Yanhua Yang1

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.2, pp. 487-500, 2023, DOI:10.32604/fdmp.2022.021149

    Abstract River bending is the major effect responsible for bed topography and bank changes. In this study, fluid velocity (measured by a three-dimensional Doppler advanced point current meter) and bed topographical data have been collected in 40 sections of an experimental model. The whole flume was composed of an organic glass bend, upstream and downstream water tanks, two transition straight sections, a circulation pump, and a connection pipeline. Each section has been found to be characterized by a primary circulation and a small reverse circulation, with some sections even presenting three more or more circulation structures. More >

  • Open Access


    Analysis of the Microstructure of a Failed Cement Sheath Subjected to Complex Temperature and Pressure Conditions

    Zhiqiang Wu1,2, Yi Wu2, Renjun Xie2, Jin Yang1, Shujie Liu3, Qiao Deng4,*

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.2, pp. 399-406, 2023, DOI:10.32604/fdmp.2022.020402

    Abstract One of the main obstacles hindering the exploitation of high-temperature and high-pressure oil and gas is the sealing integrity of the cement sheath. Analyzing the microstructure of the cement sheath is therefore an important task. In this study, the microstructure of the cement sheath is determined using a CT scanner under different temperature and pressure conditions. The results suggest that the major cause of micro-cracks in the cement is the increase in the casing pressure. When the micro-cracks accumulate to a certain extent, the overall structure of the cement sheath is weakened, resulting in gas More >

  • Open Access


    Numerical Simulation and Experimental Study of the Stress Formation Mechanism of FDM with Different Printing Paths

    Heping Hou1, Yang Yue1,*, Jian Liu1, Darun Xi2, Shanhui Liu1

    Journal of Renewable Materials, Vol.11, No.1, pp. 273-289, 2023, DOI:10.32604/jrm.2023.021167

    Abstract Environmental contamination has been caused by petroleum-based polymeric materials in the melt deposition process. Nowadays biodegradable materials have been widely used in the fused deposition modeling (FDM) industry, such as polylactic acid (PLA). However, internal complex thermal stress and deformations in part caused by an uneven distribution of PLA filament deposition temperatures during FDM, which will seriously affect the geometric accuracy of the printed part. In order to reduce material waste and environmental pollution during the printing process, the accuracy of PLA part can be improved. Herein, numerical simulation was carried out to investigate the… More >

  • Open Access


    Experimental Study of Mode-I and Mode-II Interlaminar Fracture Characteristics of Poplar LVL

    Zhongping Xiao1, Chen Li1,2, Biqing Shu1, Shukai Tang2, Xinghuan Yang2, Yan Liu2,*

    Journal of Renewable Materials, Vol.11, No.1, pp. 245-255, 2023, DOI:10.32604/jrm.2023.020751

    Abstract Fracture is a common failure form of poplar laminated veneer lumber (LVL). In the present work, we performed an experimental study on the mode-I along-grain interlaminar fracture, mode-I cross-grain interlaminar fracture, and mode-II interlaminar fracture of poplar LVL. We investigated stress mechanisms, failure modes, and fracture toughness values of the different fracture types. The experimental results revealed that the crack in the mode-I along-grain interlaminar fracture specimen propagated along the prefabricated crack direction, and the crack tip broke. The mode-I cross-grain interlaminar fracture specimen had cracks in the vertical direction near the prefabricated crack. In… More >

  • Open Access


    Experimental Study on the Treatment of Tertiary Oil Recovery Wastewater via a Novel Electro-Coagulation Method

    Wei Cui1,2,*, Zhilun Yan1,2, Zhi Tang1,2, Mengyao Xu1,2, Jian Tian1,2, Chengyi Shen1,2

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.1, pp. 51-60, 2023, DOI:10.32604/fdmp.2023.021499

    Abstract At present, methods for treating tertiary oil recovery wastewater via electro-coagulation are still in their early stage of development. In this study, a device for electro-coagulation wastewater treatment was built and tested in an oil field. The effects that the initial pH value, electrode type, and connection mode have on the coagulation and separation effect were assessed by measuring the mass fraction and turbidity of oil. The results have shown that when the electro-coagulation method is used, the effectiveness of the treatment can be significantly increased in neutral pH conditions (pH = 7), in acidic conditions, and More >

  • Open Access


    Experimental Study on the Degradation of Bonding Behavior between Reinforcing Bars and Concrete after Corrosion and Fatigue Damage

    Shiqin He*, Jiaxing Zhao, Chunyue Wang, Hui Wang

    Structural Durability & Health Monitoring, Vol.16, No.3, pp. 195-212, 2022, DOI:10.32604/sdhm.2022.08886

    Abstract In marine environments, the durability of reinforced concrete structures such as bridges, which suffer from the coupled effects of corrosion and fatigue damage, is significantly reduced. Fatigue loading can result in severe deterioration of the bonds between reinforcing steel bars and the surrounding concrete, particularly when reinforcing bars are corroded. Uniaxial tension testing was conducted under static loading and fatigue loading conditions to investigate the bonding characteristics between corroded reinforcing bars and concrete. An electrolyte corrosion technique was used to accelerate steel corrosion. The results show that the bond strength was reduced under fatigue loading, More >

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