Fracture analysis of Pre-cracked 8YSZ TBCs with edge and internal cracks under Thermo-mechanical load: A numerical approach

Kadam, Prajakta Jagtap; Damale, A. V.; Kadam, Nikhil R.

doi:10.1016/j.matpr.2022.04.415

Cited by 6 publications

(1 citation statement)

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“…In investigation methods on cracking, the finite element method (FEM) is commonly used to simulate the formation and growth of cracks. Kadam and Koushali et al used the finite element method to perform failure analysis in the context of YSZ and concluded that the internal stresses causing coating cracking are typically interlayer positive stresses and shear forces, which correspond to type I and type II fracture modes, respectively [23,24]. Using the finite element method, Zhi-Y et al explained the YSZ coating peel fractures as the connection between the interface peak and the cracks within the YSZ [25].…”

Section: Introductionmentioning

confidence: 99%

Effect of Hot Spot within Combustion Liner on YSZ Crack Propagation Mode

Guo

Wang²,

Shi³

et al. 2023

Coatings

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On the aero-engine combustor liner, a phenomenon of overheating resembling a hot spot exists, accompanied by a preferential peeling of the YSZ thermal barrier coating that will negatively affect the service life of the component. The hot spot temperatures will affect the ineffectiveness of YSZ, so in this paper, the morphological and property changes of YSZ sintering is investigated experimentally, and a coupled analysis of the YSZ crack propagation mode under the hot spot is performed using ABAQUS. The results show that the pore fractal size D of YSZ increases by 15%. Inside the hot spot region, the coating has a shear stress of 75 MPa. By inserting cohesive units globally in the FEM to simulate the random crack initiation and propagation, unlike the thinning of YSZ layered peeling caused by uniform superheating, the hot spot will cause the crack initiation at the tip of the pores inside the coating and the oblique propagation, eventually forming an oblique crack connection through the pores. When the temperature gradient reaches 30 K/mm, the crack propagation is 40% greater than in a uniform temperature field; consequently, the YSZ in the hot spot boundary region with a greater temperature gradient results in more severe bulk peeling.

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Section: Introductionmentioning

confidence: 99%