Chengjiang, China
Chengjiang, China

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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.


Zhao X.,Fasten Group Ltd | Liu L.,Fasten Group Ltd | Ji J.,Fasten Group Ltd | 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.


Tian W.-Y.,Jiangyin Polytechnique College | Chen Q.-F.,Fasten Group Co.
Journal of Clinical Rehabilitative Tissue Engineering Research | Year: 2010

BACKGROUND: Thermofusion device utilized in interventional surgery easily leads to sealing carbonization or blood leaking due to overheat. OBJECTIVE: To discuss the application of PTC polymer in radio-frequency thermofusion device. METHODS: For medical application of PTC Polymer in radio-frequency endo-surgical devices, polymer selecting rules were set and the PTC was prepared; the function of prepared device was tested. RESULTS AND CONCLUSION: The functional testing showed that the device meet the requirement on RF thermo-fusion and tissue cut. With the application of the key material into thermal fusion devices, it yielded fast and safe dissection and fusion of tissues and arteries of varies diameter; no fume, no carbonization and no conglutination between device surface and coagulation tissues are found. Because of minimum heat conduction, the device can protect effectively the surrounding organs as thin as possible. By combining such device with conventional electrosurgical station, minimum output and auto-stopping operation can be realized.


Jin W.,Nanjing University of Science and Technology | Liu L.,Nanjing University of Science and Technology | Liu L.,Fasten Group Ltd | Wu J.,Nanjing University of Science and Technology | Zhao X.,Fasten Group Ltd
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 cage guide are difficult to monitor their loosening state; usually periodic inspections by artificial are conducted at the cost of time and money; however, it is very difficult to check whole bolts in-site carefully. To improve this situation, an effective method is proposed to detect the bolt loosening, which used Radio Frequency Identification Device (RFID) technique. The main principle of the detection system is that the metal film can influence the data communication between the RFID tag and the reader. Therefore, a proof-of-concept model is established consisting of the bolt gearing system, passive UHF RFID tags, reader network, and monitoring software. A metal film and the RFID tag are bonded to the big gear, and the small gear’s center is the bolt to be detected. The reader cannot receive the signal from the tag obscured by a metal film. In contrast, the tag cannot be completely covered by a metal film when the bolt is loosen, so the RFID tag transmits data over the air in response to interrogation by an RFID reader, and then the location of loosen bolts is found. The test results revealed that the bolt loosening can be effectively detected, proving the applicability of this system to the maintenance of the bolt joints of cage guide. The novel developed monitor system is expected to solve conventional problems of the detection of bolt loosening by enabling measurement of structural members, which was previously impossible, thus indicating a high potential of this method to accurately monitor bolt loosening. © 2015 Taylor & Francis Group, London.


Fu S.,Nanjing University of Science and Technology | Wu J.,Nanjing University of Science and Technology | Liu L.,Fasten Group Ltd | Zhao X.,Fasten Group Ltd
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.


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.


Patent
Fasten Group Company Ltd | Date: 2012-08-08

A bridge intelligent cable system with a built-in fiber grating sensor is provided, which is applied in a cable bearing structure such as a cable-stayed bridge, a suspension bridge, and an arch bridge. The system includes an anchor cup (1), a wire dividing plate (5), a connecting cylinder (4), a fiber grating sensor, and a cable body (11), in which the fiber grating sensor includes a fiber grating strain sensor (9) and a fiber grating temperature sensor (10), tail fibers of the fiber grating strain sensor (9) and the fiber grating temperature sensor (10) are led out, the packaged fiber grating strain sensor (9) is fixedly connected to an outer-layer steel wire (3) of the connecting cylinder (4), the packaged fiber grating temperature sensor (10) is suspended on the steel wire (3) of the connecting cylinder (4), holes (5-1) are punched in the wire dividing plate (5), and a preserved steel pipe (7) is buried in advance in the connecting cylinder (4) and the anchor cup (1). The system improves survival rates of the fiber grating sensor and the fibers in cable manufacturing and application processes, ensures reliability of the embedding technology of the fiber grating sensor, and effectively leads a fiber grating signal out of the cable body without distortion.

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