TY - JOUR
T1 - On Stresses Induced in a Thermal Barrier Coating Due to Indentation Testing
AU - Yan, Jin
AU - Karlsson, Anette M
AU - Bartsch, Marion
AU - Chen, Xi
N1 - Yan, J., Karlsson, A. M., Bartsch, M., 2009, "On Stresses Induced in a Thermal Barrier Coating due to Indentation Testing," Computational Materials Science, 44(4) pp. 1178-1191.
PY - 2009/2/1
Y1 - 2009/2/1
N2 - Instrumented indentation has been suggested as a method to determine interfacial fracture toughness of thermal barrier coatings. However, in a previous experimental study we showed that the results are ambiguous. In this work, we investigate the experimental results by numerical simulations incorporating the material microstructure. In the numerical simulations, based on finite element analyses, the stress fields that are associated with the loading and unloading of the indenter are investigated. By comparing these stress fields to the damage observed in the experimental study, including crack path and interfacial delaminations, we explain key findings from the experimental observations. Our results suggest that indentation testing of multilayered coated structures might not induce the delamination in the overall weakest interface and therefore the test results must be evaluated with care.
AB - Instrumented indentation has been suggested as a method to determine interfacial fracture toughness of thermal barrier coatings. However, in a previous experimental study we showed that the results are ambiguous. In this work, we investigate the experimental results by numerical simulations incorporating the material microstructure. In the numerical simulations, based on finite element analyses, the stress fields that are associated with the loading and unloading of the indenter are investigated. By comparing these stress fields to the damage observed in the experimental study, including crack path and interfacial delaminations, we explain key findings from the experimental observations. Our results suggest that indentation testing of multilayered coated structures might not induce the delamination in the overall weakest interface and therefore the test results must be evaluated with care.
KW - Indentation; Thermal barrier coatings (TBC); Multilayered coatings; Interfacial fracture toughness; Numerical simulations
UR - https://engagedscholarship.csuohio.edu/enme_facpub/118
U2 - 10.1016/j.commatsci.2008.07.037
DO - 10.1016/j.commatsci.2008.07.037
M3 - Article
VL - 44
JO - Computational Materials Science
JF - Computational Materials Science
ER -