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Material parameter The fluid medium is air with density of 1.225kg/m3, and the temperature is 300K.
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Acknowledgement This material is based upon work supported by the Applied Basic Research Project of Science and Technology department of Sichuan, China (2015JY0276), the Key Research Program of Xihua University (Z1020212, Z1120225), the Open Research Fund of Key Laboratory of Manufacturing and Automation of Xihua University (SZjj2011-016) and the National Nature Science Foundation of China (51305357).
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Acknowledgements This work was financially supported by the National Natural Science Foundation of China (41071017), and the key project of National Natural Science Foundation of Chongqing, China (2008BA0015).
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Materials and Methods Strip casting, rolling, recrystallization.
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Fig.1 Chemical structure of carboxylic polymer SLPC 3.Experimental materials and methods 3.1 Materials of concrete and paste A kind of P.O.42.5 cement of JinYu brand was chosen, aggregates including machine-made commingle sand, with a finess modulus of 2.5 and a powder content of 7～9％, and machine-made gravel, with a granule diameter of 5～25mm, were mainly from Hebei Sanhe, mineral admixtures included fly ash of grade II from Gaojin fire plant and the milling slag powder from principal steel factory, chemistry admixtures were a high range polycarboxylic water-reducer JSPC3002 for construction market and the SLPC.
Acknowledgment The authors are thankful to the Natural Sciences Foundation Council of Beijing, China (2072006), Beijing imbursing project of excellence persons(20061D0501700243）.
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Overseas and Domestic Research Status There are multiple ways of measuring torque, for example, torque is measured by feelings of shaft deformation, such as the way of pasting strain gauges in the rotating shaft surface, coating magnetostrictive materials, placing piezoelectric crystal and so on; The torque is also can be acquires by measuring the phase of shaft two section with double section tooth ring, photosensitive materials, laser speckle optical methods.
Various types of torque sensors are designed, such as magnetic susceptibility, gas sensor, force sensor, thermal, optical, laser and other types, the torque sensor materials are from metal materials into semiconductor, ceramic, optical fiber and other.
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