Detecting the phase transformation temperature of Ni-Ti Shape Memory Alloy (SMA) Fiber by Electrical Resistance Method
Shape memory alloy fibers have a novel ability to memorize their shape and bring intelligent features to textile. Phase transition temperatures are the key parameters that decide the processing and working temperatures. In this paper, transformation of Ni-Ti shape memory alloy fiber was investigated by electrical resistance method. The the resistivitytemperature relationship was derived by logistics marten site volume growth model and mixing rule. In testing, a Ni-Ti fiber with Ni％=55.5a.t.％ was fixed in a hollow tube sealed by resin, the tube was submerged into ice-salt solution to have a uniform changed temperature, the entire device was placed in a temperature chamber. By connecting the Ni-Ti fiber into four electrode electric bridge, the resistance of the fiber was transformed into voltage signal, and meanwhile, the real-time temperature was detected by the tube wall stuck a thermocouple sensor. The resistance-temperature was obtained by data acquisition devices. According to the constitutive relation derived, the effect of temperature resistivity can be eliminated by derivation of the resistance-temperature relationship. The results showed that the Ti-Ni fibers martens tic start temperature Ms was 34.4°C, end temperature Mf was 25.6°C, the austenitic start temperature As was 39.4°C and end temperature Af was 51.1°C. The type of transformation can be judged by the resistance-temperature curves.
Shape memory alloy Ni-Ti alloy fiber Phase transformation temperature Electrical resistance method
Xu Lei Wang Rui Zhang Shu-jie Yang Qiu-Hong
College of Textile, Tianjin Polytechnic University, Tianjin, China
国际会议
上海
英文
998-1002
2009-05-27（万方平台首次上网日期，不代表论文的发表时间）