Crack Spacing Distribution in Coating Layer of Galvannealed Steel under Applied Tensile Strain

Ochiai, Shojiro; Iwamoto, Shinichiro; Nakamura, Toyomitsu; Okuda, Hiroshi

doi:10.2355/isijinternational.47.458

Cited by 13 publications

(14 citation statements)

References 26 publications

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“…The cohesive properties of the coating (critical strain, toughness, and Weibull modulus) are derived from fragmentation stage I [16,17,[27][28][29][30]. The toughness can be calculated assuming that it is equal to the energy release rate at critical strain [31,32]:…”

Section: The Fragmentation and Electro-fragmentation Test Methodsmentioning

confidence: 99%

Mechanical integrity of thin inorganic coatings on polymer substrates under quasi-static, thermal and fatigue loadings

et al. 2010

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The interplay between residual stress state, cohesive and adhesive properties of coatings on substrates is reviewed in this article. Attention is paid to thin inorganic coatings on polymers, characterized by a very high hygro-thermo-mechanical contrast between the brittle and stiff coating and the compliant and soft substrate. An approach to determine the intrinsic, thermal and hygroscopic contributions to the coating residual stress is detailed. The critical strain for coating failure, coating toughness and coating/substrate interface shear strength are derived from the analysis of progressive coating cracking under strain. Electrofragmentation and electro-fatigue tests in situ in a microscope are described. These methods enable reproducing the thermo-mechanical loads present during processing and service life, hence identifying and modeling the critical conditions for failure. Several case studies relevant to food and pharmaceutical packaging, flexible electronics and thin film photovoltaic devices are discussed to illustrate the benefits and limits of the present methods and models.

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Section: The Fragmentation and Electro-fragmentation Test Methodsmentioning

confidence: 99%

Mechanical integrity of thin inorganic coatings on polymer substrates under quasi-static, thermal and fatigue loadings

et al. 2010

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“…The accuracy of this method is primarily related to the absence of third body interactions, such as indentercoating friction in case of scratch and indentation tests, or adherent-coating traction in case of peel and pull-out tests. The topic of multiple cracking of coatings on high elongation substrates (and matrices in composite laminates) has motivated a considerable amount of work, for instance to obtain statistical strength parameters from crack spacing distributions (Hui et al, 1999;Leterrier et al, 1997a,b;Ochiai et al, 2007) and layer toughness (Kim and Nairn, 2000;Nairn, 2000). Prior analyses of experimental data, however, are limited to single coatings (Andersons et al, 2007;Handge, 2002;Handge et al, 2000;Howells et al, 2008;Hsueh and Yanaka, 2003;Leterrier et al, 2004;Tang et al, 2001;Yanaka et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Models for saturation damage state and interfacial shear strengths in multilayer coatings

Leterrier

Waller

Nairn

2010

Mechanics of Materials

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a b s t r a c tThe present work investigates the saturation damage state of a two-layer coating on a substrate (layer 1/layer 2/substrate) under uniaxial tensile loading in order to derive expressions for the interfacial strength between layer 1 and layer 2, and between layer 2 and substrate. It is based on experimental data on specimens where layer 1 is an inorganic film, layer 2 is an organic coating and the substrate is a polymer. The analysis is relevant to the cases where layer 1 cracks first, followed by layer 2, in which cracks appear due to stress concentrations caused by the cracks in layer 1. It considers the cases where at least one interface is completely yielded with shear stress equal to the interfacial shear stress, and where the crack density in layer 1 is equal to or higher than the crack density in layer 2. The possible situations depend on the relative shear strengths between layers 1 and 2 and between layer 2 and the substrate. The interfacial shear strength between layer 1 and layer 2, and between layer 2 and substrate are derived for elastic and yielded stress transfer cases and found to frame experimental values obtained with single-layer coatings.

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“…[6][7][8] The intermetallic phases can exhibit multiple cracks under both thermally induced residual stresses and externally applied stresses. [9][10][11] As a matter of fact, such loads, generating large deformations, induce the formation of cracks in the coating. The passage of both air and moisture from the environment through the cracks leads to oxidation and corrosion reactions in both substrate (steel) and coating.…”

Section: Introductionmentioning

confidence: 99%

“…Many experimental investigations have been performed to analyze damage evolution in coated components. [11,[13][14][15][16][17] In the experimental studies reported in refs. [13,15,16], performed on galvanized steels under different static loading conditions, it was observed that the brittleness of δ phase (highlighted by the highest microhardness and stiffness and the lowest toughness) with respect to that of ζ and η phases is the main factor that causes damage initiation in coatings.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Traditional and Technological Zinc‐Based Coatings: Part II

et al. 2022

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Herein, the bending behavior of hot‐dip galvanizing hot‐rolled hypersandelin plates, together with the corresponding crack pattern, is numerically investigated by using a hybrid model developed in Ansys LS‐DYNA environment, by combining the discrete element method (DEM) with finite element method (FEM). The experimental bending tests here simulated and available in the literature are performed by considering two types of bath, that is, a pure zinc bath and a technological bath, consisting in a zinc bath with 3% Sn addition by weight. The results related to the bending behavior are compared with both experimental data and other FE numerical results, previously obtained by some of the present authors. Moreover, the numerical crack patterns are compared with the experimental observations of the longitudinal section of the plates at the end of testing, by means of a light optical microscope. A quite satisfactory agreement is observed.

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Crack Spacing Distribution in Coating Layer of Galvannealed Steel under Applied Tensile Strain

Cited by 13 publications

References 26 publications

Mechanical integrity of thin inorganic coatings on polymer substrates under quasi-static, thermal and fatigue loadings

Mechanical integrity of thin inorganic coatings on polymer substrates under quasi-static, thermal and fatigue loadings

Models for saturation damage state and interfacial shear strengths in multilayer coatings

Numerical Simulation of Traditional and Technological Zinc‐Based Coatings: Part II

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