A Three-Point Bending Test Machine for Studying the Thermomechanical Properties of Shape Memory Alloys

An experimental test machine for studying of the thermomechanical properties of shape-memory alloys in the temperature range from −130 to +300°C under mechanical stresses of up to 2000 MPa and the maximum bending deformation of a sample of up to 20% is described. The principle of operation of the test machine is based on three-point bending of a sample at a variable temperature and a constant load. The deflection of the sample is measured by an optical displacement transducer, which determines the high accuracy and reliability of the results. The apparatus was tested using samples of the Ni49.8Ti50.2 shape-memory alloy.