Episode 114 of the Professor Alex Volinsky podcast. A review, not an experiment — and the abstract is not retrievable, so this episode surveys the territory such a review covers. Damage sequence: cracks initiate at coating defects, channel across the coating, then deflect along the interface (delamination) or penetrate the substrate. Based on the paper: Review of the Fatigue Behavior of Hard Coating-Ductile Substrate Systems; Yan-yun Bai, Jin Gao, Tao Guo, Ke-wei Gao, Alex A. Volinsky, Xiao-lu Pang; International Journal of Minerals, Metallurgy and Materials, 2021, Vol. 28(1), pp. 46-55. Hosts Elena and Marcus. AI-generated voices.