Instrument and method for mechanical properties in situ testing of materials under high temperature and complex mechanical loads

An instrument for mechanical properties in situ testing of materials under a high temperature and complex mechanical loads, comprising:

• a support frame module;
• a high-frequency fatigue load applying module;
• a static-dynamic mechanical load applying module;
• a high/low temperature applying module;
• and
• an in-situ monitoring module,
• wherein the support frame module is isolated from a vibration through a vibration isolation spring and is fixed to the ground through an anchor screw;
• wherein the high-frequency fatigue load applying module is rigidly connected to a support plate in the support frame module through a motor support base, is matched with a rail assembly I of the support frame module through a slider assembly I, and is rigidly connected to welded bellows I of a high-temperature applying sub-module through a connecting flange, and the high-frequency fatigue load applying module is configured to apply a high-frequency fatigue load on a tested sample or apply a static bending preload on the tested sample;
• wherein the static-dynamic mechanical load applying module is rigidly connected to a mounting platform of the support frame module through a hydraulic cylinder fixing plate and an intermediate connecting plate, and is connected to welded bellows II, welded bellows IV, and welded bellows III of the high-temperature applying sub-module through a flange of a high-temperature connecting rod I, a flange of a high-temperature connecting rod II, and a flange of a high-temperature connecting rod III respectively, and the static-dynamic mechanical load applying module is configured to apply a combination of static-dynamic tension/compression/bending loads on the tested sample;
• wherein the high-temperature applying sub-module of the high/low temperature applying module is rigidly connected to the mounting platform through an L-shaped rail base, a low-temperature applying sub-module of the high/low temperature applying module is matched with a rail assembly III of a rotary cart through a slider assembly III, and the high-temperature applying sub-module and the low-temperature applying sub-module are switchable for use, so as to apply a variable temperature environment from a low temperature to a high temperature on the tested sample;
• wherein the in-situ monitoring module is arranged in front of the high-temperature applying sub-module and behind the high-temperature applying sub-module, and is integrally fixed on the mounting platform, and the in-situ monitoring module is configured to dynamically monitor microstructure evolution of the tested sample and a fatigue failure mode of the tested sample in situ;
• and
• wherein the high-frequency fatigue load applying module is arranged vertically, the static-dynamic tension/compression load applying sub-module is arranged horizontally, and the high-frequency fatigue load applying module and the static-dynamic tension/compression load applying sub-module are perpendicular to each other in space;
• the high-frequency fatigue load applying module is individually operable, to apply a static bending preload and a high-frequency fatigue load on the tested sample during a test;
• and the high-frequency fatigue load applying module is operable in cooperation with the static-dynamic tension/compression load applying sub-module to apply a high-frequency fatigue load on the tested sample loaded with a static-dynamic bending load applied.