Zhu H.,Nanjing University of Science and Technology |
Dong K.,Nanjing University of Science and Technology |
Wang H.,Fasten Group Co. |
Huang J.,Nanjing University of Science and Technology |
And 3 more authors.
Powder Technology | Year: 2013
In this paper, the iron matrix composite TiC/Fe was fabricated by an in-situ process called exothermic dispersive synthesis from a powder blend of pure elements Fe, Ti and C. The microstructure of the resulting composite was investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray energy dispersive spectroscopy (EDS). Only TiC phase was found to form during the heating process. Differential scanning calorimetry (DSC) analysis reveals that the reaction between C and Ti occurs through one step and its activation energy is 2586.5. kJ/mol. Moreover, with the increase of the heating rate, the reaction peak shifts to the higher temperature. The whole reaction consists of three distinct stages: at the start, the reaction rate is very slow, and then it increases rapidly, finally it becomes slow again toward the completion. During the heating process, C diffused into the iron matrix and the content of C in the iron can exceed 2.11%, leading to the formation of both eutectic and eutectoid structure in the final composite. © 2013. Source
Iron wire; steel wire; wire of common metal; wire of common metal alloys; slings of metal for handling loads; ropes of metal; bindings of metal; non-electric cables of metal; binding thread of metal for agricultural purposes.
Zhao X.,Fasten Group Co. |
Liu L.,Fasten Group Co. |
Ji J.,Fasten Group Co. |
Li S.,Wuhan University of Technology |
And 2 more authors.
Yadian Yu Shengguang/Piezoelectrics and Acoustooptics | Year: 2013
The specific fiber Bragg grating(FBG) strain sensors and FBG temperature sensors were fixed on the outer steel wires of cable pipe so that the smart bridge cable was realized successfully which can monitor on-line cable force and temperature in real-time. However, the reliability of smart bridge cable with built-in sensor should be researched further. By simulating the bearing alternating stress load on the smart cable during operation period and based on the fatigue performance requirements for the bridge cable in National Standard GB/T18365-2001, the fatigue property of the smart bridge cable integrated with FBG sensors was tested. The results showed that the smart bridge cable met the requirements of fatigue and static load. The sensing signal of the built-in FBG sensor was still effective after and during 2 million fatigue cycle times of smart bridge cable. Source
Luan B.-F.,Chongqing University |
Zhang D.,Chongqing University |
Guo N.,Chongqing University |
Xu W.-L.,Fasten Group Co. |
And 3 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2011
Microstructure of two kinds of hot rolled hypereutectoid steel wire rod for bridge steel cable were characterized by means of optical microscopy(OM), filed emission scanning electron microscopy(FEG-SEM), x-ray energy dispersive spectrometer(EDS) and electron backscatter diffraction(EBSD) technique. One kind was DP wire rod cooled by Stelmor conveyor line, the other was DLP rod cooled by salt-bath quenching. The results of microstructure analysis indicate that the average grain size of surface layer of the DP wire rod is less than that of the center area. More irregular pearlite lamellar structure is observed in the cross section of the DP rod and the pearlite interlamellar spacing of the DP rod is less than that of DLP wire rod. Moreover, less difference of average grain size is found between the surface layer and the center area as well as the uniform pealite lamellar structure is observed in the DLP wire rod. Source
Fu S.,Nanjing University of Science and Technology |
Wu J.,Nanjing University of Science and Technology |
Liu L.,Fasten Group Co. |
Zhao X.,Fasten Group Co.
Structural Health Monitoring and Integrity Management - Proceeding of the 2nd International Conference of Structural Health Monitoring and Integrity Management, ICSHMIM 2014 | Year: 2015
The bolt joints on the cage guides are exposed to the possibility of damage, and thus, require intensive care. Periodic manned surveillance was conducted at cost of money and time. Nevertheless, it was very difficult to check many bolts on the cage guides carefully. An approach to efficiently monitor multipoint bolts of the cage guide has been proposed in this paper. The bolt fastening monitoring sensor consists of a reed switch, a DF wireless data module with 315 Mhz operation frequency, and encoders PT2262. The reed switch was trigged ON or OFF by changes in the surrounding magnetic field. The reed switch was attached to nuts. The DF wireless data module as a RF transmitter. In the experiment, when the bolt loosening the reed switch had been closed and the RF transmitter sent a message. The receiving terminal will check out the bolt loosening. The spectrum of DF wireless module tests and bolt loosening experiments shown that bolt loosening can be effectively detected within 300 m. The newly developed sensor system is expected to solve multipoint bolts detection problems and provided a low-power monitoring technology. © 2015 Taylor & Francis Group, London. Source