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  • 1
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    Influencing Factors on Shear Strength of Asphalt Mortar with High Viscosity (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-05-17
    Description: In order to study the influencing factors on the shear strength of asphalt mortar with high viscosity, many different compositions are considered to analyse the shear strength of asphalt mortar, such as asphalt from different resource, mineral powder, wimble weight, temperature and ratio of filler to bitumen. The results indicate that among these factors, the influence of wimble strength is the smallest, which can be ignored. The shear strength of asphalt mortar decreases with increasing temperature from 25°C∼50°C. Meanwhile it changes with the ratio of filler to bitumen by 1.2 under the temperature changing from 25°C∼35°C. Also with the rising ratio between filler and bitumen, the sheer strength of mortar increases. However, the temperature sensitivity changes differently with its peak. Compared to the type of mineral powder, the influence of asphalt resource on shear strength and temperature sensitivity are more significant.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 2
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    Rheological Properties of Asphalt Mortar with High Viscosity (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-05-17
    Description: In order to study the rheological and rotary viscosity characteristics of asphalt mortar with high viscosity containing different asphalt and filler, the component, filler-bitumen ratio and temperature are considered. The results show that among these factors, viscosity and specific surface area are the main factors that influence the ability of resistance to high temperature deformation. The temperature sensitivity and G*/sinδ increase with increasing filler-bitumen ratio.The growth rate changes corresponding to the filler-bitumen ratio of 1.2. A good exponential relationship exists between G*/sinδ and Brookfield rotary viscosity at 135°C and 150°C. Thus, the results of Brookfield rotary viscosity can be used to estimate the influence of filler-bitumen ratio to asphalt mortar characteristics at high temperature instead of filler-bitumen ratio to asphalt mortar characteristics at high temperature instead of G*/sinδ.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 3
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    The Architecture Design of Detection and Calibration System for High-voltage Electrical Equipment (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-02-08
    Description: With the construction of Material Quality Inspection Center of Shandong electric power company, Electric Power Research Institute takes on more jobs on quality analysis and laboratory calibration for high–voltage electrical equipment, and informationization construction becomes urgent. In the paper we design a consolidated system, which implements the electronic management and online automation process for material sampling, test apparatus detection and field test. In the three jobs we use QR code scanning, online Word editing and electronic signature. These techniques simplify the complex process of warehouse management and testing report transferring, and largely reduce the manual procedure. The construction of the standardized detection information platform realizes the integrated management of high-voltage electrical equipment from their networking, running to periodic detection. According to system operation evaluation, the speed of transferring report is doubled, and query...
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  • 4
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    Effect of Impact Hydroforming Loads on the Formability of AA5A06 Sheet Metal (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-09-22
    Description: Recently, aluminium (Al) alloys are increasingly used in the automobile and aerospace industries because of their light weight and corrosion resistance properties. However, the applications of these materials are limited due to their poor formability especially at room temperature. Although hydroforming technology is one of the approaches used to improve the formability of Al alloys, it still cannot fulfil the requirements of designers and manufacturers to form high-quality complex shaped components. It has been found that high-speed forming is able to improve the formability of low plasticity metals at room temperature. Thus, impact hydroforming (IHF) technology is proposed by combining the advantages of high-speed forming and hydroforming, and it was used to address the issues of quasi-static hydroforming. Accordingly, the aim of this study is to investigate the effect of IHF on the formability of AA5A06 sheet metal. An IHF bulge experiment setup was developed by making use of...
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  • 5
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    ARIEL E-linac Cryogenic System: Commissioning and First Operational Experience (2015)
    Institute of Physics (IOP)
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    Publication Date: 2015-12-19
    Description: The Advanced Rare IsotopE Laboratory (ARIEL) is a major expansion of the Isotope Separator and Accelerator (ISAC) facility at TRIUMF. A key part of the ARIEL project is a 10 mA 50 MeV continuous-wave superconducting radiofrequency (SRF) electron linear accelerator (e-linac). The 1.3 GHz SRF cavities are operated at 2 K. HELIAL LL helium liquefier by Air Liquide Advanced Technologies (ALAT) with a tuneable liquid helium (LHe) production was installed and commissioned in Q4’2013 [1]. It provides 4 K liquid helium to one injector and one accelerator cryomodules that were installed and tested in 2014. The 4 K to 2 K liquid helium transition is achieved on-board of each cryomodule. The cryoplant, LHe and LN2 distributions, sub-atmospheric (S/A) system and cryomodules were successfully commissioned and integrated into the e-linac cryogenic system. Required pressure regulation for both 4 K cryoplant in the Dewar and 2 K with the S/A system was achieved under simulated load. Final integr...
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  • 6
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    Pump hump characteristic research based on mass transfer equation (2015)
    Institute of Physics (IOP)
    Details
    Publication Date: 2015-01-16
    Description: The current development of modern pumped storage plants aims towards a higher flexibility in operation, an extended operation range of the hydraulic machine (especially in the pumping mode), and a higher reliability. The pumping requirements are the crucial design drivers, since, even if the turbine mode performance is very sound, the success of a project depends also on the pump turbine delivering the required maximum pump head and starting reliably in pump mode. Pump hump (pump instability working points at highest head) which is an instability source to the pump-turbine vibration is a serious damage to the pump operation on high head. So the pump hump and cavitation number based on the numerical simulation and experiment results are shown in this paper. The pump hump is sensitive affected by the cavitation number. With the cavitation number decreasing, the hump on flow characteristic curve (e.g. head-flow rate curve, H-Q curve) is gradually decreasing until vanished. P...
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  • 7
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    Evaluation of Disaster Prevention and Sheltering Index of Stadiums Based on Combination of Normal and Disaster time (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-08-03
    Description: Urban disaster Shelters play a vital role in dealing with all kinds of major disasters in cities. As an important part of the modern city disaster prevention and refuge, the sport stadiums based on combination of normal time and disaster time have the unique advantage of emergency refuge and can play an irreplaceable role in other disaster prevention shelters. In normal times, the stadiums play sports entertainment functions, and can be converted into disaster prevention shelters when disasters occur. In this paper, by establishing the evaluation index system of the disaster prevention and shelter in stadiums, the AHP is used to analyse the potential of disaster prevention and refuge in several different types of stadiums, and then comprehensively evaluates the disaster prevention and evacuation capabilities of stadiums.
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 8
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    The Energy Distribution Properties of the Guided Wave in the Underground Layered Pipeline Structure: Finite Element Simulation and Experimental Verification (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-08-04
    Description: Many layered pipe structures (LPSs) are covered under the soil, so it is important to investigate the guided wave propagation characteristics for underground LPSs in structural health monitoring (SHM). The paper aims to propose a finite element model to describe the ultrasonic guided wave propagation properties in (underground) layered pipeline. Firstly, a selection of suitable excitation frequency and mode of PZT-based guided waves is successfully finished. Secondly, finite element analysis (FEA) using ABAQUS software is applied to establish an (underground) layered pipe model with piezoceramic (PZT) transducers for generating the guided waves. The finite element analysis (FEA) results show that the soil have a significant impact on the generating modes. The analysis of reflection signal is difficult because of mode conversion. Thus, the energy method of guided wave is used in order to analyze properties of underground layer pipe. The soil impacts for layered pipe focus on the ...
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  • 9
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    Effect of Mn on microstructure and corrosion properties of extruded Mg-1%Zn alloy (2017)
    Institute of Physics (IOP)
    Details
    Publication Date: 2017-03-11
    Description: The microstructure of the extruded Mg-1Zn alloy doped with different content of manganese was analyzed by optical microscopy, scanning electron microscopy with energy dispersive X-ray spectroscopy and X-ray diffractometry. The mass-loss immersion method and electrochemical test were used to evaluate the corrosion properties. The results show that the microstructure of the extruded Mg-1%Zn- x %Mn (mass fraction, x =0.4, 0.8, 1.2) alloys consists of α-Mg and α-Mn, the grain size of α-Mg decreases with increasing Mn content. Electrochemical corrosion behavior of the alloys is similar. Mn has considerable effect on the corrosion rate, the corrosion process is exacerbated by the galvanic corrosion occurred at interface between α-Mg and α-Mn. The corrosion rate increases as the Mn content increases. Mg-1%Zn-0.4% Mn alloy exhibits the best corrosion resistance between the Mg-1%Zn- x %Mn alloys
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 10
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    Optimum design of exit guide vane on the bidirectional tubular turbine (2013)
    Institute of Physics (IOP)
    Details
    Publication Date: 2013-12-22
    Description: Performance prediction about the forward generation condition based on a bidirectional through-flow turbine runner was conducted. The model characteristic curves and efficiency curve under reverse generation condition were plotted. In order to improve the reverse performance, exit guide vanes were lied behind the runner, the forward and reverse operating performance about a runner lied post-guide vane were numerically simulated. The results shows that the flow field distribution on forward generation condition did not significantly change after exit guide vanes were lied, and the energy conversion efficiency decreased. After exit guide vanes were lied, flow pattern of runner intake on under reverse generation condition were bettered, and the energy conversion efficiency increased. This study confirms that the exit guide vanes can improve the hydraulic performance of the turbine on reverse generation condition in view of numerical simulation.
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