Transient crack growth under creep conditions

Hawk, D. E.; Bassani, J.L.

doi:10.1016/0022-5096(86)90018-9

Cited by 56 publications

(23 citation statements)

References 12 publications

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“…Hui and Riedel [25] demonstrate that for a growing crack, with damage neglected, as r ~ 0 the creep and elastic strain-rates are of the same order of magnitude. Complete solutions for transient crack growth under SSC are given by Hawk et al [2,3].…”

Section: Crack Tip Fields Under Small-scale Creepmentioning

confidence: 99%

“…The load is suddenly applied at time t = 0 and either instantaneously or after an incubation period the crack begins to propagate. This problem has been considered in detail in [2][3][4][5], where the influence of damage on creep is neglected, that is, the creep potential is given by (4) with f -1. Riedel [1,8,26] has analyzed crack growth in a material described by the Kachanov creep-damage equations, i.e., (6) and (7) with ~0 = 0.…”

Section: Crack Tip Fields Under Small-scale Creepmentioning

confidence: 99%

“…In terms of the K field, RR field and HR stress fields defined by (11), (12), and (15) respectively, Hawk and Bassani [2,3] have demonstrated the following evolution for the transient crack-tip fields under SSC conditions. At time t = 0, the crack-tip solution is simply the elastic K field.…”

Section: Transient Crack Growth: Matching Of Singular Fieldsmentioning

confidence: 99%

“…Recent studies [2][3][4][5] that neglect the effect of damage on creep demonstrate that the crack-tip fields under small-scale-creep (SSC) conditions have a complex history or time dependence. In fact, the appropriate fracture parameter that correlates crack growth under SSC conditions is a subject of considerable debate [6,7].…”

Section: Introductionmentioning

confidence: 99%

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Influence of damage on crack-tip fields under small-scale-creep conditions

Bassani

Hawk

1990

Int J Fract

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The growth of a sharp crack typically is accompanied by a damage or fracture process zone that propagates with the crack tip. The present understanding of the transient crack-tip fields under small-scale-creep conditions is limited primarily to analyses based upon creep flow rules that neglect damage. In this paper, Kachanov-type creep-damage constitutive equations are developed that include the dilatational creep that arises from caviation and microcrack damage. A finite element calculation demonstrates the effects of this type of creep-damage behavior on the asymptotic, singular crack-tip fields.

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Section: Crack Tip Fields Under Small-scale Creepmentioning

confidence: 99%

Section: Crack Tip Fields Under Small-scale Creepmentioning

confidence: 99%

Section: Transient Crack Growth: Matching Of Singular Fieldsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of damage on crack-tip fields under small-scale-creep conditions

Bassani

Hawk

1990

Int J Fract

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“…The crack growth rate is correlated with C * (t) in the extensive creep regime according to ASTM E1457 [11], the only available standard for creep crack growth testing of metallic materials, and with C t parameter [12] in the small-scale creep to the extensive creep regimes. However, recent experimental data [13,14] and analytical evidence [15,16] has shown that C * (t) is not suitable for characterising creep crack growth behaviour in materials with low ductility in which the crack tip can advance at a rate comparable to the creep zone expansion rate. This directs attention to the crack tip parameters that correlate data in both creep ductile and creep brittle materials.…”

Section: Introductionmentioning

confidence: 99%

High temperature crack initiation and defect assessment of P22 steel weldments using time dependent failure assessment method

Doğan¹,

Ceyhan²,

Petrovski³

2007

Engineering Fracture Mechanics

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High temperature deformation and crack resistance of low alloy ferritic grade P22 steel weldments applied in power plants are reported. The creep crack initiation (CCI) and creep crack growth (CCG) data were determined using compact type (C(T)) and C-Shape (CS(T)) fracture mechanics specimens at 550 °C. The deformation and crack growth behaviour of similar weldment zones and significance of CCI and CCG in defect assessment of components were addressed. The weldments with industrially relevant properties were produced in butt welded pipe joint from which test specimens are sampled. The studied material covers a spectrum of microstructures and ductility over the weldment zones to give representative for a welded component. The emphasis is placed on the measurement and particularly analysis of crack initiation for failure assessment in P22 steel weldments. The particular importance of construction of isochronous curves for time dependent failure assessment diagram (TDFAD) method is reported. It is aimed to contribute establishing guidelines for acceptable methodologies for testing, analysis and assessment of welded components using TDFAD for high temperature service.

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Some recent developments in numerical modelling of fracture toughness in brittle matrix composites

Hom

Mataga

McMeeking

1989

Numerical Meth Engineering

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Finite element analysis was used to study the fracture toughening of a c e r v i c by a stress induced dilatant transformation of second phase particles. The finite element method was based on a continuum theory which modelled the composite as subcntical material. Transient crack growth was simulated in the finite element mesh by a nodal release technique. The crack's remote tensile opening load was adjusted to maintain the near-tip energy release rate at the level necessary for crack advance. The transformation zone surrounding the crack developed as the crack propagated through the composite. Resistance curves were computed from the analysis; and the results show that during crack advance maximum toughness is achieved before a steady state is reached.The toughening effect of a crack-bridging ductile phase in a brittle material may be predicted if ligament deformation is characterized. A plastically deforming ligament constrained by surrounding elastic matrix material is modelled using finite elements and the relevant toughness enhahcement information extracted.Comparison is made to model experiments as well as to toughness measured for technologically important materials. The results suggest that debonding along the interface between the ligament and the matrix may enhance the toughening effect of a ductile phase.

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Transient crack growth under creep conditions

Cited by 56 publications

References 12 publications

Influence of damage on crack-tip fields under small-scale-creep conditions

Influence of damage on crack-tip fields under small-scale-creep conditions

High temperature crack initiation and defect assessment of P22 steel weldments using time dependent failure assessment method

Some recent developments in numerical modelling of fracture toughness in brittle matrix composites

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