モアレ法による測定ひずみぼ下限界について

概要

論文の詳細を見る
The moire method is a means of strain measurement which utilizes the change of interfringe spacing due to the applied stress, The errors introduced in the measurement of interfringe spacing have thus direct influence on the calculated values of strain. In the present study, the equation for calculating the strain from the measured interfringe spacing was derived from arbitrary amounts of mismatch and misalignment, and the relation between the exact strain and the errors in measurement was obtained from this equation. Further, the procedure is described for determining the lowest limit of strain which can be measured within the prescribed allowable errors. The results of this study may be summarized as follows. (1) The rate of change in the interfringe spacing due to the applied load is smaller for larger amounts of mismatch and misalignment. (2) From the relation between the errors of measurement and the rate of change in the interfringe spacing, there exists a certain domain of unmeasurable strain. (3) The lowest limit of the measurable strain under predetermined amounts of mismatch and misalignment can be determined from the curves of relative errors versus the exact amount of strain. Besides, this lowest limit of strain becomes larger with the increase of mismatch and misalignment as well as the errors in the measurement of interfringe spacing.
社団法人日本材料学会の論文
1970-07-15