Aiming at problem that it is difficult to measure mechanical properties

a new mechanical-property testing device is designed which can apply alternating load and conduct tensile test simultaneously. Working principle and components of the testing device are presented. Based on piezoresistive effect

a force sensor with double parallel flexible hinge structure is designed and its resolution can reach 2 m N. The vibration module is composed of piezoelectric ceramics and level amplifier which can realize stable output of alternating load at the frequency of 0. 7 k Hz. Data acquisition and motion control system are developed based on VB. NET software platform. It can realize the automatic leveling of fixed and moving platform and tensile testing. Feasibility and stability of the system are verified by comparing the repetitive experiments of the pre-applied alternating load and the direct tensile test.