In-situ testing device and method for mechanical behavior of material under force-heat-humidity coupling

The invention relates to an in-situ testing device and method for mechanical behaviors of a material under force-heat-humidity coupling, and belongs to the field of material testing. The low-temperature nitrogen heater, the two mechanical loading assemblies, the atmosphere cavity, the X-ray imaging assembly, the high-temperature nitrogen on-off assembly, the low-temperature nitrogen on-off assembly and the gas control assembly are all fixed to the table top of the frame body. The device has the advantages that the structure is novel, the humidity in the cavity can be accurately controlled by adjusting the volume of nitrogen and water vapor in the atmosphere cavity, mechanical contact can be eliminated through non-contact heating, the mechanical loading assembly can conduct static and dynamic stretching/compression on a sample, the X-ray imaging assembly can monitor the change in the sample in real time, and the detection accuracy is high. Further, a damage mechanism of the sample under the condition of force-