Creep crack growth in steel at 838 K I: Behaviour at a constant load

Neate, G.J.

doi:10.1016/0025-5416(86)90095-9

Cited by 30 publications

(31 citation statements)

References 20 publications

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“…Creep crack initiation data for a normalised and tempered 1/2CrMoV steel at 565°C have been given by Neate [5]. The measured COD at crack incubation, di, was found to be dependent on stress.…”

Section: Materials' Datamentioning

confidence: 99%

Example of an Application of an Assessment Procedure for Defects in Plant Operating in the Creep Range

Ainsworth¹,

Coleman²

1987

Fatigue Fract Eng Mat Struct

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A worked example is presented to illustrate the application of a CEGB procedure for the assessment of defects in plant that operates within the creep range. The example chosen is a large cylindrical pressure vessel with a fully circumferential crack for which experimental results are available. The example demonstrates that it is straightforward to perform the calculations required in the procedure for the time for structural failure by continuum damage mechanisms, the time for crack incubation and the time for crack growth. It is predicted that crack incubation in the pressure vessel occurs at about one-third of life with the remaining life being taken up by crack growth. The predictions are in close agreement with the experimentally observed incubation, growth and final failure times.

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Section: Materials' Datamentioning

confidence: 99%

Example of an Application of an Assessment Procedure for Defects in Plant Operating in the Creep Range

Ainsworth¹,

Coleman²

1987

Fatigue Fract Eng Mat Struct

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“…Thus, these data suggest that correlations of crack growth rate with C* may be valid over a slightly wider range than allowed by inequality (10). The incubation displacements measured by Neate [25] did not satisfy inequality (5). This indicates that for practical purposes, inititiation should be assumed to occur at time-zero.…”

Section: Representative Materials Datamentioning

confidence: 98%

“…In [2], materials data are examined from a range of materials: C-Mn steel weld metal [24],1/2 CrMoV steel in the bainitic and normalised and tempered conditions [25], and type 316 stainless steel [26]. For illustrative purposes, the data for 112 CrMoV steel in the untempered, coarse-grained bainitic condition are described here.…”

Section: Representative Materials Datamentioning

confidence: 99%

“…A range of specimen geometries was tested by Neate [25] at 565°C but only the tests on CT specimens are considered here. The validity requirements with respect to crack size and specimen dimensions were met in all tests.…”

Section: Representative Materials Datamentioning

confidence: 99%

“…The uniaxial creep curves for this material showed pronounced primary stages and in calculating Czf a primary creep law has been used in conjunction with a strain hardening rule to allow for increase in stress as the crack grew. It may be noted that if a steady state law had been used instead of the full creep curves to evaluate C$ this would have led to gross underestimates of the C* values obtained experimentally [25].…”

Section: Representative Materials Datamentioning

confidence: 99%

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Cegb Assessment Procedure for Defects in Plant Operating in the Creep Range

Ainsworth¹,

Chell

Coleman³

et al. 1987

Fatigue Fract Eng Mat Struct

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In recent years considerable progress has been made in research work addressing the behaviour of defects at elevated temperature. Developments have been made both in structural assessment techniques and in methods for analysing representative materials data. On the basis of these developments a procedure has been produced within the CEGB for the assessment of defects in plant operating in the creep range under loadings for which creep rather than creep-fatigue is the dominant failure mechanism. This paper describes the CEGB procedure. Calculations are required for three events: the time for overall structural failure by continuum damage mechanisms; the time for incubation prior to crack extension; and the time for subsequent growth to a maximum tolerable defect size. Methods are presented for calculating these times and for obtaining the materials data required to perform the calculations.

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Contour Integrals For Creep Crack Growth Analysis

Blackburn

1989

Mechanics of Creep Brittle Materials 1

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Creep crack growth in steel at 838 K I: Behaviour at a constant load

Cited by 30 publications

References 20 publications

Example of an Application of an Assessment Procedure for Defects in Plant Operating in the Creep Range

Example of an Application of an Assessment Procedure for Defects in Plant Operating in the Creep Range

Cegb Assessment Procedure for Defects in Plant Operating in the Creep Range

Contour Integrals For Creep Crack Growth Analysis

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