System and method for monitoring metal sample stress in high-temperature and high-pressure environment in real time

The invention provides a system and method for monitoring metal sample stress in a high-temperature and high-pressure environment in real time. The system comprises two connection assembly systems, two displacement sensing systems and a data acquisition system. The method includes the steps that when metal sample stress is monitored in real time and a metal sample bears axial force in the high-temperature and high-pressure environment in a high-pressure kettle, metal within the gauge length deforms in a stretch-out or draw-back mode, the deformation amount of the metal is transmitted to induction iron cores through the connection assembly systems fixed to the metal sample, inductance type extensometers can sense displacement of the induction iron cores and send out electric signals, a signal amplifier can amplify the electric signals, the data acquisition device acquires the amplified electric signals and calculates the displacement difference of the two connection assembly systems, and the metal sample stress is obtained by dividing the displacement difference by the original gauge length. The system and the method solve the problem that in the prior art, the stress can not be measured in real time in the high-temperature and high-pressure environment, high measurement accuracy is achieved, and the test requirements for mechanical and chemical interaction in various high-temperature and high-pressure environments can be met.