Method for testing mechanical property and fracture toughness of metal material in high-temperature water environment

The invention discloses a method for testing mechanical properties and fracture toughness of a metal material in a high-temperature water environment. The method comprises the following steps: step 1, pretreating a sample; 2, installing a periscope and a high-speed camera; step 3, acquiring mechanical property parameters of the material; and 4, obtaining material fracture parameters. The method is simple in step and reasonable in design, the strain distribution of the surface of the to-be-researched metal material is obtained by performing a uniaxial tensile experiment and a fracture mechanics experiment on the to-be-researched metal material in a high-temperature water environment, and the strain distribution obtained in the experiment is subjected to inversion analysis by using finite element software simulation; therefore, the mechanical property parameters and the fracture toughness are obtained, a reference basis is provided for performance evaluation of the to-be-studied metal material in the high-tempe