Abstract
In this study, the new and simple crack length measurement method by using grid pattern of Au film was suggested. Au film coated on the surface of a specimen by the ion sputtering method was cut like a comb by scanning laser beam condensed as a line, and the fine grid pattern film with the grid width, 10μm, and space width, 7μm, was made. Further, to confirm the validity of the method the crack growth test was carried out with four-point bending using soda-lime glass specimens. As a result, it was confirmed that the crack length measurement using the fine grid pattern film could express the relationship between the crack growth rate and stress intensity factor of the material in detail, and the possibility of the application to the other ceramic materials was also showed.
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