Start-stop torque is one of the key parameters of valve's capacity. In China, a torque spanner is used to measure the
small-bore torque, but the accuracy is not very high. In the large-bore situation, the previous method can not be used to
measure the torque, so the torque is determined by the design calculation result. Sometimes this result is far from the
practical one, and the difference will impact the apolegamy of the actuating device of a valve. Some other methods, such
as inductance type transducer valve torque sensor, strain gauge valve torque sensor, appeared. They both have the
advantage of high accuracy, but their automatic level is low and their measuring equipments are complex. In this paper, a
new style torque measuring device which is based on theory of mechanics of materials and measuring principle of strain
gauge is designed. The maximal torque is 2000Nm. The measuring device is easy for installation, accurate on results,
and is able to meet the actually online measuring demands.
Martensitic phase transformation is an important style of nondispersive solid state change. Shape memory effect of shape
memory alloy (SMA) was just discovered in this transformation. Generating, growing and spreading of martensitic phase
transformation belt are the major areas of SMA research. Interface of martensitic phase transformation of NiTi
polycrystal SMA under the tensile stress is studied by using Moiré interference technique in the paper. Also ANSYS
software is used to simulate the process of martensitic phase transformation under the same condition. These two
methods get the uniform result, thus providing some reference to the further application study of SMA.
Study on the mechanical behavior of FRP-concrete structure is mainly by means of theoretic calculation and experimental analysis. Comparing with the electrical strain gauge which are generally used to measure the external strain for short term, fiber optic sensor which is embedded in the interface of FRP tube and inner concrete, can easily not only measure the internal strain of the structure, but also monitor the crack expanding of inner concrete. The Mach-Zehnder interferometer is applied in the strain measurement. The optical parameter of fiber optic sensor is identified in the calibration experiment, so the internal strain can be calculated by processing the experimental optical signal. The method of automatic data collection and signal processing of the measuring system is presented in the paper.