| 摘要 |
PROBLEM TO BE SOLVED: To provide a device and program for automatically measuring fatigue crack of an object to be measured.SOLUTION: An apparatus for automatically measuring fatigue crack of an object includes a CCD camera 4, a triaxial moving stage device 7, and a computer 10. The computer 10 includes: a specific area extraction unit 29 which extracts a pattern located in a first specific area and a pattern located in a second specific area in an initial image on the basis of the position of imaging means; a corresponding area extraction unit 30 which extracts a pattern located in a second corresponding area in an image captured when a load is applied to a test piece T; a crack tip progress determination unit 31 which determines that a crack tip has progressed on condition that a difference between a distance of patterns located in the first and second specific areas and a distance of patterns located in the first and second corresponding areas is equal to or larger than a predetermined size. Every time the number of load applications reaches a predetermined number of times, on the basis of image data indicating an image captured by imaging means, a length and progress speed of a crack K are measured. |
