Thermo-Mechanical Properties of Shape Memory Alloy Tan Wee Choon, Saifulnizan Jamian and Mohd. Imran Ghazali Faculty of Mechnical and Manufacturing, Universiti Tun Hussien Onn Malaysia Abstract— The Young’s modulus and the Coefficient of Stress Influence are two important parameters of thermo-mechanical properties of shape memory alloys. These parameters are important in the design but there are no technical data on it. A novel method was used to determine the Young’s modulus of shape memory alloys during martensite phase and austenite phase, and the Coefficient of Stress Influence during austenite-martensite and martensite-austenite by using Universal Testing Machine. The load applied on to the Flexinol wire for one cycle was at a very low speed of testing. Throughout the test, the Flexinol wire was heated up to a certain temperature level and maintained it constant by using chamber. The Young’s modulus at martensite phase and austenite phase were 33.160 GPa and 69.592 GPa while the Coefficient of Stress Influence during austenite-martensite and martensite-austenite were 10.761 MPa/ 0 C and 9.082 MPa/ 0 C. Keywords— Young’s modulus, Coefficient of stress influence, Shape memory alloy, Universal Testing Machine III. INTRODUCTION Shape memory alloys are widely used in the engineering applications especially in the robotic, aerospace and vibration control area. To design and optimise the applications of the shape memory alloys, a clear understanding of its behavior and characteristics is required. The thermo-mechanical properties for the shape memory alloys such as the Young’s modulus at martensite phase and austenite phase and the Coefficient of Stress Influence during austenite-martensite and martensite-austenite were the properties that should be determined before designing the system. Unfortunately the properties provided by the manufacture normally were not complete. So further investigation or testing need to be done. Differential Scanning Calorimetry (DSC) is one of the famous method that done to determine the phase transformation temperatures which is one of the important thermo- mechanical properties for the shape memory alloys. The past researchers [1,2,3,4,5], had suggested that DSC as the standard method to determine the phase transformation temperatures for their research purposes but from the analysis that was done, the DSC method is only suitable for the powder form product and not suitable for finished form product such as wire. Some other researchers proposed other methods to determine the properties of the shape memory alloys. Mohammad H Elahinia and Mehdi Ahmadian, [6] suggested to use a linear variable differential transformer (LVDT) consists of a stack of masses that was actuated vertically by an SMA wire. The stress applied to the SMA wire can be adjusted by adding mass to or removing mass from the stack. A personal computer