TY - GEN
T1 - Thermal cycling induced crack nucleation and propagation in thermal barrier coating system
AU - Sun, Yongle
AU - Zhang, Weixu
AU - Tian, Man
AU - Wang, T. J.
PY - 2011/2/4
Y1 - 2011/2/4
N2 - Failure of thermal barrier coating (TBC) system is associated with the morphological imperfection of thermally grown oxide (TGO) layer. The objective of this work is to numerically investigate the crack nucleation and propagation in TBC system upon thermal cycling based on a cohesive zone model, in which TGO thickness imperfection effect is incorporated. The results show that TGO/BC (bond coat) interface is subjected to high tensile stress in the vicinity of TGO thickness imperfection during thermal cycling, thereby inducing crack nucleation. Owing to the plastic deformation of BC, fracture behavior of TGO/BC interface is related to BC yield strength for a typical thermal growth rate of TGO. Furthermore, the embedded oxide in BC could be also ruptured as a result of the increasing transverse stress, which will lead to the coalescence of adjacent cracks.
AB - Failure of thermal barrier coating (TBC) system is associated with the morphological imperfection of thermally grown oxide (TGO) layer. The objective of this work is to numerically investigate the crack nucleation and propagation in TBC system upon thermal cycling based on a cohesive zone model, in which TGO thickness imperfection effect is incorporated. The results show that TGO/BC (bond coat) interface is subjected to high tensile stress in the vicinity of TGO thickness imperfection during thermal cycling, thereby inducing crack nucleation. Owing to the plastic deformation of BC, fracture behavior of TGO/BC interface is related to BC yield strength for a typical thermal growth rate of TGO. Furthermore, the embedded oxide in BC could be also ruptured as a result of the increasing transverse stress, which will lead to the coalescence of adjacent cracks.
KW - Cohesive zone model
KW - Crack
KW - Thermal barrier coating
KW - Thermal cycling
UR - http://www.scopus.com/inward/record.url?scp=79551492147&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/KEM.462-463.383
DO - 10.4028/www.scientific.net/KEM.462-463.383
M3 - Conference contribution
AN - SCOPUS:79551492147
SN - 9780878492107
T3 - Key Engineering Materials
SP - 383
EP - 388
BT - Fracture and Strength of Solids VII
T2 - 8th International Conference on Fracture and Strength of Solids 2010, FEOFS2010
Y2 - 7 June 2010 through 9 June 2010
ER -