Evaluation of Interfacial Strength of Brittle Coating Films by Tensile Test.

Nakasa, Keijiro; Takata, Soichiro; Ichigo, Hirozo

doi:10.2472/jsms.44.321

Cited by 10 publications

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“…Eventually, to this end, it is helpful to investigate the cracking behavior in coating film under the monotonic loading. This can be characterized by a critical strain corresponding to the crack initiation on the coating film which is related to the fatigue strength of coated materials [8,9].…”

Section: Introductionmentioning

confidence: 99%

Influences of Cracking Behavior of Coating Film on Fatigue Strength in Alumina Coated Stainless Steels

Shin

Katagiri²

2004

KEM

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Static tensile tests and cyclic plane bending tests of alumina coated stainless steels were conducted in ambient air in order to investigate how the cracking or decohesion of coating film related to the fatigue behaviors of the base metal. The coating processes employed were the plasma-chemical vapor deposition method and the ion-plating. The coated specimens showed similar stress-strain curves with that of the base metal, except for the crystalline alumina coated specimen with a lower flow stress. The critical strain corresponding to crack initiation in the coating film as well as the fatigue strength in the coated specimens varied depending on the coating process employed. An increase in the fatigue limit and prolonged fatigue lifetime in most coated specimens were observed as compared with that of the base metal. In the case of the ion plated specimen, it fatigued at a high stress amplitude level, and fatigue cracks were induced in the substrate where the coating film had cracked or delaminated. These led to a shorter fatigue life than the base metal. Both the suppression effect of slip deformation in the substrate by the coating film and the damage formation in the coating film influenced the fatigue strength of the coated specimens.

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Section: Introductionmentioning

confidence: 99%

Influences of Cracking Behavior of Coating Film on Fatigue Strength in Alumina Coated Stainless Steels

Shin

Katagiri²

2004

KEM

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“…In some cases, however, the coating can be cracked and delaminated by stress-or heatcycles and overloading, so that the characterization of cracking and delamination behaviors is essential to maintain the reliability of coated structures. Present authors [3,4] have already proposed a method to evaluate the delamination strength from uniaxial tensile test of a smooth specimen with thermally-sprayed coating based on Kendall's analysis [5], where the loading direction is parallel to the coating and the delamination of coating occurs mainly by shear stress along the interface.…”

Section: Introductionmentioning

confidence: 99%

An Analysis of Repeating-Division Type Cracking Pattern in Brittle Coating under Equi-Biaxial Tension

Gao

Nakasa

Kato

2000

Journal of the Society of Materials Science, Japan

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In order to characterize the "Repeating-division type" cracking pattern which is often observed in the brittle coating on a ductile substrate under equi-biaxial tension, the bulge tests were carried out on steel disks with WC-Co coating which was deposited by high-velocity flame spraying. Moreover, an elastic-plastic analysis was applied to the division process of coating to derive the relation among crack interval, tensile stress and strain of substrate at the division, coating and substrate thickness, strength of coating, interfacial strength between coating and substrate, and material's constants. The characteristics of the division process calculated from the analytical equation agree semiquantitatively well with the experimental results that the crack interval decreases with increasing tensile stress and increases with increasing coating thickness.

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An analysis of island-delamination type cracking pattern in the brittle film coated on a disk under axisymmetric tension

Nakasa¹,

Takata²,

Ichigo³

1998

Engineering Fracture Mechanics

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Evaluation of Interfacial Strength of Brittle Coating Films by Tensile Test.

Cited by 10 publications

References 0 publications

Influences of Cracking Behavior of Coating Film on Fatigue Strength in Alumina Coated Stainless Steels

Influences of Cracking Behavior of Coating Film on Fatigue Strength in Alumina Coated Stainless Steels

An Analysis of Repeating-Division Type Cracking Pattern in Brittle Coating under Equi-Biaxial Tension

An analysis of island-delamination type cracking pattern in the brittle film coated on a disk under axisymmetric tension

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