The tensile failure of nickel oxide scales at ambient and at growth temperature

Nagl, M. M.; Saunders, S. R. J.; Evans, W. T.; Hall, D. W.

doi:10.1016/0010-938x(93)90315-8

Cited by 67 publications

(40 citation statements)

References 8 publications

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“…This shows that the optimal crack arrangement is that of an equally distributed array of cracks throughout the film, recovering experimental evidence of periodicity of the cracks [22], without making any a priori assumption on the topology of the crack set.…”

Section: Solution For a Perfectly Bonded Film Subject To Transverse Cmentioning

confidence: 95%

Fracture and debonding of a thin film on a stiff substrate: analytical and numerical solutions of a one-dimensional variational model

Baldelli

Bourdin

Marigo

et al. 2012

Continuum Mech. Thermodyn.

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We study multifissuration and debonding phenomena of a thin film bonded to a stiff substrate using the variational approach to fracture mechanics. We consider a reduced one-dimensional membrane model where the loading is introduced through uniform inelastic (e. g. thermal) strains in the film or imposed displacements of the substrate. Fracture phenomena are accounted for by adopting a Griffith model for debonding and transverse fracture. On the basis of energy minimization arguments, we recover the key qualitative properties of the experimental evidences, like the periodicity of transverse cracks and the peripheral debonding of each regular segment. Phase diagrams relate the maximum number of transverse cracks that may be created before debonding takes place, as a function of the material properties and the sample's geometry. The theoretical results are illustrated with numerical simulations obtained through a finite element discretization and a regularized variational formulation of the Ambrosio-Tortorelli type, which is suited to further extensions in two-dimensional settings.

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Section: Solution For a Perfectly Bonded Film Subject To Transverse Cmentioning

confidence: 95%

Fracture and debonding of a thin film on a stiff substrate: analytical and numerical solutions of a one-dimensional variational model

Baldelli

Bourdin

Marigo

et al. 2012

Continuum Mech. Thermodyn.

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“…2 [7]. Nagl et al [8] divided the process when metal with an oxide layer is elongated into three stages. Up to the critical tensile strain no cracks were observed.…”

Section: Theoretical Failure Mechanismmentioning

confidence: 99%

Mechanical descaling of wire rod using reverse bending and brushing

Gillström

Jarl

2006

Journal of Materials Processing Technology

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“…For instance, Nagl et al [6] show how an oxide layer in a tension test first develops an increasing number of transverse cracks ; above a critical density, interfacial cracks develop, starting from transverse crack corners, leading to delamination of oxide rafts. A transition criterion is proposed is [7,4], involving layer thickness, fracture stress and interfacial toughness; it allows to measure the ultimate shear strength of the interface [7].…”

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confidence: 99%

Mechanical behaviour of iron oxide scale: Experimental and numerical study

Picqué

Bouchard

Montmitonnet

et al. 2006

Wear

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Picqué et alMechanical behaviour of iron oxide scale 2 SummaryThe paper addresses the identification of constitutive parameters of thick, brittle layers on metal substrates. Application is to the iron oxide behaviour during hot rolling processes of steel, where oxide scale breaking and embedding is one of the major causes of surface defects. Contact management of a FEM software has been adapted in order to address the transitions corresponding to transverse oxide fracture, along with two other mechanisms, namely delamination and interfacial stick / slip. It is applied to the hot strip rolling process to show pre-bite cracking and its consequences ("microextrusion" of the metal). To approximate the stress state prevailing at roll bite entry, the four-point Hot Bending Test (4PHBT) has been selected for the measurement of oxide properties. Oxidation is made in-situ in the test rig under conditions similar to a Hot Strip Mill (HSM) environment. Comparison of load-deflection curves for oxidized and nonoxidized samples allows to determine the mechanical properties of the oxide. Above a critical temperature T c -around 700°C, but depending on strain rate -the oxide is ductile (with a very narrow plastic strain range, p < 10 -2 ), Elastic-Viscoplastic (EVP) constitutive parameters are identified numerically. Below T c , brittleness is manifested by an array of transverse, through-thickness cracks. Acoustic Emission (AE) has been used to help detect the onset of fracture, while numerical simulation gives the critical fracture stress at the corresponding point of the load-deflection curve. Results for four low carbon steel grades are compared.

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The tensile failure of nickel oxide scales at ambient and at growth temperature

Cited by 67 publications

References 8 publications

Fracture and debonding of a thin film on a stiff substrate: analytical and numerical solutions of a one-dimensional variational model

Fracture and debonding of a thin film on a stiff substrate: analytical and numerical solutions of a one-dimensional variational model

Mechanical descaling of wire rod using reverse bending and brushing

Mechanical behaviour of iron oxide scale: Experimental and numerical study

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