Abstract
When thin coated material plate is subjected to a high-temperature, the plate is bended due to difference of thermal expansion coefficient between coating and substrate. Therfore, stress in coating layer under a high-temperature will be able to measure directly through a bending deflection of the plate. The aim of this paper deals with measurement method of in si-tu stress in coating layer under thermal cycling condition. The top coating material treated in this study is conventional and virtical cracked APS 8wt%Y_2O_3-ZrO_2. Bending deflection is measured by laser senser, and in-situ stress in coating layer is obtained based on classic bending beam theory. Comparison about thermal stress between TBCs will be done.
