According to ASTM E328-78, uniformly stressedplate specimen and the apparatus for stress-re-laxation testing are designed. Stress-relaxation test are carried out accordingly.
Based on the analytical solution to stress field around a hole in a stressed orthotropic infinite width plate, a set of equations was derived to calculate the relieved strain matrix.
In this article we have theoretically and experimentally discussed how the deformation of a stressed thin plate is measured by real-time holography with bso-crystal and automatic hologram calculation.