Method for monitoring strain strengthening of connecting pipe of vacuum insulation cryogenic pressure vessel

The invention relates to the technical field of strain strengthening monitoring, in particular to a method for monitoring strain strengthening of a connecting pipe of a vacuum insulation cryogenic pressure vessel, which comprises the following steps of coating paint on the surface of the connecting pipe to be monitored for speckle treatment, reading two speckle images before and after surface deformation of the object, collecting images of the surface of the test piece before and after loading, calculating displacement, strain and deformation information of the surface of the test piece, and converging the data into a three-dimensional cloud picture, and displaying the strain condition of the three-dimensional cloud picture. A non-contact strain measurement system is adopted, a strain real-time monitoring technology for stress and strain concentration positions of the low-temperature equipment in the strain strengthening process is developed, and the strain strengthening condition of a discontinuous position