抄録
The moiré rosette method using two concentric, circular grids can be used as a mean of determining the principal strains and their directions in the case of complex strain fields. But the fundamental theory of this method has not been established yet.
In this paper, it is shown that the discrimination of principal axes and the determination of principal directions can be done by forming fringes with several mismatch values.
Further, a simple method for measuring the Poisson's ratio is presented, and its accuracy is discussed.
