In-situ testing system of metal materials under high temperature and complex loads

An in-situ testing system of metal materials under complex loads, comprising:

• a fatigue testing unit configured for pre-tightening a sample and then performing a fatigue testing on the sample;
• a loading unit configured for heating the sample;
• a signal detecting unit comprising a pressure sensor and a displacement sensor;
• the pressure sensor is configured for monitoring a tensile force to which the sample is subjected;
• the displacement sensor is configured for monitoring a displacement of the sample after being stretched during the pre-tightening of the sample;
• and
• a base configured for bearing the fatigue testing unit, the loading unit and the signal detecting unit;
• and the base is able to be positioned on a scanning electron microscope stage or an open microscopic device,
• wherein:
• the fatigue testing unit comprises a sample clamping unit, a fatigue driving module and a mechanical pre-tightening unit;
• the sample clamping unit comprises a first clamping unit and a second clamping unit, the first clamping unit is configured for clamping a first end of the sample, and the second clamping unit is configured for clamping a second end of the sample;
• the fatigue driving module comprises a fatigue driving motor, a first transmission unit, an eccentric shaft assembly, a connecting rod and a bearing, the eccentric shaft assembly is rotatably arranged on the base, the fatigue driving motor is able to drive the eccentric shaft assembly to rotate through the first transmission unit, the first clamping unit is movably arranged on the base in a telescopic direction of the sample, a first end of the connecting rod is rotatably connected with an eccentric shaft section of the eccentric shaft assembly through the bearing, and a second end of the connecting rod is rotatably connected with the first clamping unit;
• and
• the mechanical pre-tightening unit comprises a translation beam, a lead screw and a lead screw driving assembly, the translation beam is fixedly connected with the second clamping unit, the lead screw is rotatably installed on the base, the lead screw is in threaded connection with the translation beam, the lead screw driving assembly is fixed on the base, and the lead screw driving assembly is configured for driving the lead screw to rotate.