To provide a method for stress measurement applied even to a minute, brittle, and/or very little specimen.
This instrument for measuring stress acting on a specimen under test, is equipped with: a spectrum measuring part for measuring a spectroscopic spectrum at a region under test of the specimen; a storage part for previously therein storing data including at least the stress sensitivity coefficient of the specimen; an arithmetic part for performing arithmetic processing comprising a step for calculating the peak shift amount of the spectrum caused by stress from the spectroscopic spectrum of the specimen and a step for calculating stress acting on the specimen from the shift amount and from the sensitivity coefficient according to a stress calculation algorithm; and an output part for outputting a calculated stress value. The sensitivity coefficient is derived from a relation between stress distribution in the vicinity of an end of a crack in a standard specimen having the crack and a peak shift amount in the spectroscopic spectrum of the standard specimen caused by stress and measured in the vicinity of the end of the crack.
YABUUCHI YASUFUMI
MENYA KAZUNORI
TSUKAMOTO YOSHIRO
PETTSUOTTEI JUSEPPE
