A model for sliding mode crack closure part I: Theory for pure mode II loading

Tong, J.; Yates, Robert D.; Brown, M. W.

doi:10.1016/0013-7944(95)00044-v

Cited by 65 publications

(32 citation statements)

References 11 publications

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“…But, on the other hand, pure mode II loading on a rough crack generates a cyclic mode I, because gliding asperities wedge the crack open. Several analytical models (Tong et al 1995;Yu and Abel 1999;Bian et al 2006) were developed to describe the latter effect, but the assumption of rigid asperities leads to overestimate the induced K I and to underestimate K effective II . Elastic-plastic finite element simulations taking into account the contact and friction of crack face asperities can be used to overcome this limitation, as shown below.…”

Section: Kinematic Interactions Between the Crack Facesmentioning

confidence: 99%

Influence of the loading path on fatigue crack growth under mixed-mode loading

et al. 2009

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International audienceFatigue crack growth testswere performed under various mixed-mode loading paths, on maraging steel. The effective loading paths were computed by finite element simulations, in which asperity-induced crack closure and friction were modelled. Application of fatigue criteria for tension or shear-dominated failure after elastic–plastic computations of stresses and strains, ahead of the crack tip, yielded predictions of the crack paths, assuming that the crack would propagate in the direction which maximises its growth rate. This approach appears successful in most cases considered herein

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Section: Kinematic Interactions Between the Crack Facesmentioning

confidence: 99%

Influence of the loading path on fatigue crack growth under mixed-mode loading

et al. 2009

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“…Most of the literature has dealt with mode I crack closure effects. Recent work of Tong et al [21 ] addressed modeling of sliding mode crack closure effects due to faceted fracture surfaces which may prevail in Stage I propagation of small crystallographic cracks. This contrasts to plasticity-induced closure transients for both long and short cracks subjected to fairly high Figure 16.…”

Section: O(t) T(t)mentioning

confidence: 99%

“…This contrasts to plasticity-induced closure transients for both long and short cracks subjected to fairly high Figure 16. Schematic of microstructural roughness-induced crack interference for mode I and II loading [21].…”

Section: O(t) T(t)mentioning

confidence: 99%

“…Figure 16) may become more important in the HCF regime, particularly under Stage I growth where the magnitude of the crack tip sliding displacement is comparable to or exceeds the opening displacement. For small cracks growing in Stage I HCF, an inverted type of closure transient is possible as deduced from the modeling of predominate mode II growth based on frictional contact resistance along the crack faces [21]; in this case, the effective mode II stress intensity factor increases significantly as the crack lengthens, while the effective mode I stress intensity factor decreases. This behavior is quite distinct from that of plasticity-induced closure in mode I.…”

Section: O(t) T(t)mentioning

confidence: 99%

“…[13]). In this case, mixed mode I-II roughness-induced interference effects [21] as well as poorly understood mixed mode plasticity-induced closure effects will likely dominate crack growth transients rather than traditional mode I plasticity-induced closure [25] or roughness-induced closure/obstruction concepts based on mode I. In cases where Stage I crystallographic growth is promoted in HCF with little crack surface roughness, small crack arrest at barriers may be quite minimal, with little trace of a small crack threshold.…”

Section: Fracture Mechanics Parameters For Small Crack Propagationmentioning

confidence: 99%

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Basic issues in the mechanics of high cycle metal fatigue

McDowell

1996

Int J Fract

159

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Mechanics issues related to the formation and growth of cracks ranging from subgrain dimension to up to the order of one mm are considered under high cycle fatigue (HCF) conditions for metallic materials. Further efforts to improve the accuracy of life estimation in the HCF regime must consider various factors that are not presently addressed by traditional linear elastic fracture mechanics (LEFM) approaches, nor by conventional HCF design tools such as the S-N curve, modified Goodman diagram and fatigue limit. A fundamental consideration is that a threshold level for AK for small/short cracks may be considerably lower than that for long cracks, leading to non-conservative life predictions using the traditional LEFM approach.Extension of damage tolerance concepts to lower length scales and small cracks relies critically on deeper understanding of (a) small crack behavior including interactions with microstructure, (b) heterogeneity and anisotropy of cyclic slip processes associated with the orientation distribution of grains, and (c) development of reliable small crack monitoring techniques. The basic technology is not yet sufficiently advanced in any of these areas to implement damage tolerant design for HCE The lack of consistency of existing crack initiation and fracture mechanics approaches for HCF leads to significant reservations concerning application of existing technology to damage tolerant design of aircraft gas turbine engines, for example. The intent of this paper is to focus on various aspects of the propagation of small cracks which merit further research to enhance the accuracy of HCF life prediction. Predominant concern will rest with polycrystalline metals, and most of the issues pertain to wide classes of alloys.

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A mixed mode crack growth model taking account of fracture surface contact and friction

2006

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Fracture surface interactions, of whatever origin, can significantly affect the stress intensity factor, and consequently, can also be relevant to fatigue crack propagation. In the occurrence of interaction between fracture surfaces, the effective loading cycle experienced by material near the crack tip may be very different from that evaluated on the basis of the external loadings only. The purpose of the work described in this paper is to obtain the effective mode II stress intensity factor, k IIeff , in a surface cracked elasto-plastic plate with a factory roof fracture surface subjected to an in-plane shear (mode II) loading. A new model estimating the magnitude of the frictional mode II stress intensity factor, k f , arising from the mismatch of the fracture surface roughness during in-plane shear, is developed. Furthermore, the results of this study are employed in modeling the fatigue response of the surface cracked plates subjected to mixed mode loading.

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A model for sliding mode crack closure part I: Theory for pure mode II loading

Cited by 65 publications

References 11 publications

Influence of the loading path on fatigue crack growth under mixed-mode loading

Influence of the loading path on fatigue crack growth under mixed-mode loading

Basic issues in the mechanics of high cycle metal fatigue

A mixed mode crack growth model taking account of fracture surface contact and friction

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