Relation between Residual Stresses in TBCs Interface Area with TGO Interface Morphology
Considering the thermally-growth oxide (TGO) that grows between top ceramic coating (TCC)and bond coat (BC) interface and surface morphology of bond coat in a TBC system, the effect of residual stresses distribution by actual and assuming interface morphology in TGO area was calculated with ABAQUS. The calculating result shows that the residual stress of TCC/TGO and TGO/TCC interface are affected by interface morphology obviously, σyy is tensile at peaks and compressive at valleys for both with maximum stress beside the symmetrical center and at the symmetrical center respectively. σyy stress in TCC is bigger than that of BC for both. σxx stress of actual TGO in the three layers remains the same, the interim area change dramatically with TCC layer compressive stress, TGO layer smaller compressive stress, BC layer tensile stress.
Elwin Mao and Xibing Li
Z. Y. Han and H. Zhang, "Relation between Residual Stresses in TBCs Interface Area with TGO Interface Morphology", Applied Mechanics and Materials, Vol. 151, pp. 469-473, 2012