The electro-hydraulic servo fatigue testing machine, abbreviated as the testing machine, is mainly used to test the dynamic characteristics of metal, non-metal, and composite materials at room temperature (or high and low temperature, corrosive environment). The testing machine can perform the following tests: Tensile and compression tests Crack propagation test A closed-loop servo control system composed of an electrical controller, servo valve, load sensor, displacement sensor, extensometer, and computer can automatically and accurately control the testing process, and automatically measure testing parameters such as force, displacement, deformation, torque, angle, etc. The testing machine can achieve waveforms such as sine wave, triangular wave, square wave, sawtooth wave, anti sawtooth wave, pulse wave, etc. It can perform mechanical tests such as tension, compression, bending, low cycle and high cycle fatigue. Environmental testing equipment can also be configured to complete environmental simulation tests at different temperatures. The testing machine is flexible and convenient to operate, and the lifting, locking, and specimen clamping of the moving crossbeam are all completed by button operation. It adopts advanced hydraulic servo drive technology for loading, high-precision dynamic load sensors, and high-resolution magnetostrictive displacement sensors to measure the force and displacement of the specimen. The fully digital measurement and control system realizes PID control of force, deformation, and displacement, and each control can be smoothly converted between them. The experimental software works in the WINDOWS XP/Win7 Chinese environment, with powerful data processing capabilities. The experimental conditions and results are automatically saved, displayed, and printed. The entire experimental process is controlled by computers, and the testing machine is an ideal cost-effective testing system for industries such as research institutes, metallurgical construction, national defense and military industry, colleges and universities, mechanical manufacturing, transportation, etc.