Periodic cracking of functionally graded coatings

Erdoğan, F.; Öztürk, Murat

doi:10.1016/0020-7225(95)00065-6

Cited by 91 publications

(37 citation statements)

References 13 publications

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“…Figures 2 and 3 show the static SIF for the periodic surface crack in an isotropic FGM coating bonded to a homogeneous half space with βh = −1 and βh = 1, respectively. Since the results obtained by us agree very well with those presented by Erdogan and Ozturk [13], only our numerical results are plotted in Figs. 2 and 3.…”

Section: Numerical Results and Discussionsupporting

confidence: 62%

“…(18) is just the results for the inhomogeneous coating bonded to an infinite homogeneous substrate, and Erdogan and Ozturk [13] have studied the corresponding static problem with isotropic properties. For d=h, the result of Eq.…”

Section: Integral Equationsmentioning

confidence: 97%

“…To make the analysis tractable, the shear moduli and mass density of the FGM coating and the substrate are assumed to be [13]:…”

Section: Formulation Of Problemmentioning

confidence: 99%

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Anti-plane problem of periodic cracks in a functionally graded coating–substrate structure

Chen

2005

Arch Appl Mech

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The static and dynamic anti-plane problem for a functionally graded coating-substrate structure containing a periodic array of parallel cracks, which are perpendicular to the boundary, is considered. Integral-transform techniques are employed to reduce the problem to the solution of an integral equation with hypersingular kernels. Numerical results are presented to show the influence of geometry, material properties and material gradient parameter on the fracture behavior.

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Section: Numerical Results and Discussionsupporting

confidence: 62%

Section: Integral Equationsmentioning

confidence: 97%

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Anti-plane problem of periodic cracks in a functionally graded coating–substrate structure

Chen

2005

Arch Appl Mech

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“…Meanwhile, Li and Wu [17] studied the problem of periodic array of cracks in the anisotropic material. The anti-plane shear problem for periodic cracking in functionally graded coatings has been considered by Erdogan and Ozturk [18] . Wang and Mai [19] studied the problem of a periodic array of cracks in an infinite functionally graded material under mechanical and thermal loading.…”

Section: Introductionmentioning

confidence: 99%

The periodic crack problem in bonded piezoelectric materials

Ding

Xing

2007

Acta Mech. Solida Sin.

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The problem of a periodic array of parallel cracks in a homogeneous piezoelectric strip bonded to a functionally graded piezoelectric material is investigated for inhomogeneous continuum. It is assumed that the material inhomogeneity is represented as the spatial variation of the shear modulus in the form of an exponential function along the direction of cracks. The mixed boundary value problem is reduced to a singular integral equation by applying the Fourier transform, and the singular integral equation is solved numerically by using the GaussChebyshev integration technique. Numerical results are obtained to illustrate the variations of the stress intensity factors as a function of the crack periodicity for different values of the material inhomogeneity.KEY WORDS periodic array of parallel crack, functionally graded piezoelectric material, singular integral equation, Gauss-Chebyshev integration technique

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“…Issues about cracks in TBCs during service were investigated extensively in previous studies, with consideration of different influence factors. Erdogan and Schulze [12,13] investigated the effect of periodic surface cracks on the interfacial fracture behaviors. Chen et al [14] found different failure modes in TBCs with bond coat deposited by different spraying methods.…”

Section: Introductionmentioning

confidence: 99%

Competition mechanism of interfacial cracks in thermal barrier coating system

et al. 2017

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Abstract:The mechanism of competition between different interfacial cracks is investigated, specifically considering the cracks at top-coat/bond-coat and bond-coat/substrate interfaces in a thermal barrier coating system (TBCs). To assess the cracking process driven by mechanical loading, in-situ three-point bending tests were conducted on TBCs samples having different top coats (TC) and bond coats (BC). The competition between cracks at TC/BC and BC/substrate interfaces was observed for the first time, and then analyzed to elucidate the mechanism. Experimental and numerical results show that the differences in modulus ratio and thickness ratio of TC to BC are the main factors controlling the competition, which eventually leads to different fracture modes, i.e. when TC thickness is large or BC modulus is low, the coatings peel off from the TC/BC interface; while, with the decreasing TC thickness or increasing BC modulus, the delamination location changes to BC/substrate interface. A failure map based on the two ratios is numerically established, which agrees well with the experimental results. It is advised that the crack propagation path can be controlled by adjusting the combination of the two ratios to trigger both TC/BC and BC/substrate interfacial cracks in TBCs, thereby leading to more energy dissipation and better bending-resistance.

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Periodic cracking of functionally graded coatings

Cited by 91 publications

References 13 publications

Anti-plane problem of periodic cracks in a functionally graded coating–substrate structure

Anti-plane problem of periodic cracks in a functionally graded coating–substrate structure

The periodic crack problem in bonded piezoelectric materials

Competition mechanism of interfacial cracks in thermal barrier coating system

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