Residual thermal strain measuring method, residual thermal strain measuring device, and program thereof

摘要

PROBLEM TO BE SOLVED: To precisely measure a x direction, a y direction, a shearing, and a main residual strain distribution from a periodic pattern acquired in a single time even in the case of a specimen largely deformed which is a measurement object.SOLUTION: A residual thermal strain distribution measurement method measures a residual thermal strain distribution as a residual thermal deformation generated when a thermal load is applied to a specimen, and records an image of a periodic pattern present on a surface of the specimen by image recording means at a first temperature and a specimen generation temperature when the specimen is generated, and a moire fringe is generated based on each image of the recorded periodic patterns, and a phase of the moire fringe relating to the specimen at the first temperature is calculated, and the phase of the moire fringe relating to the specimen at the specimen generation temperature is calculated, and a phase difference of the moire fringe at the specimen generation temperature with respect to the first temperature is acquired, and the residual thermal strain of the specimen at the first temperature with respect to the specimen generation temperature is calculated based on the acquired phase difference.SELECTED DRAWING: Figure 1