For studying environmental deterioration and damage, the foreign object impact tests were carried out for thermal barrier coating material by use of gas-gun-type accelerator, and then FEM analysis was conducted for simulating impact damage. As a result, following conclusions were obtained. 1)Impact damage of the single-particle impact test was caused in the boundary between top coating and bond coating, and formed cracks of the delamination which brought the spalling of top coating. 2)From FEM analysis, shear strain arises in the impact point, and extends along the surface of coating. Maximum peak distribution of shear strain almost corresponds to delaminated length. 3)Delaminated length of coating which is equivalent to impact shear strain could be evaluated by standardized kinetic energy of projectile, that is kinetic energy divided by cross sectional area of projectile.
