The influence of plasticity in creep crack growth in steels

Fookes, AJ; Smith, David J.

doi:10.1016/s0308-0161(03)00100-5

Cited by 18 publications

(7 citation statements)

References 11 publications

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“…When data for crack extensions less than 0.5 mm are excluded, more than 50% of the test duration would be removed. Similar results were also found for other tests and are examined in detail in Fookes 17 . Therefore, it would not be valid to use data shown in Fig.…”

Section: Methodssupporting

confidence: 67%

“…To overcome this, Fookes 15 develops a method of obtaining experimental values of the plastic displacements using key curve analysis. 17 Shown in Fig. 5 the inelastic strain rates to determine C * , results show similar trends to those shown in Fig.…”

Section: Characterization Of Ccgsupporting

confidence: 69%

“…Furthermore, the analysis using reveals that , which is physically meaningless and suggests that the sum of the elastic and plastic displacement rates is overestimated. To overcome this, Fookes 15 develops a method of obtaining experimental values of the plastic displacements using key curve analysis 17 …”

Section: Methodsmentioning

confidence: 99%

“…Similar results were also found for other tests and are examined in detail in Fookes. 17 Therefore, it would not be valid to use data shown in Fig. 4b to correlate CCG rate using C * .…”

Section: Characterization Of Ccgmentioning

confidence: 99%

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A new method for assessing high‐temperature crack growth

Fookes

Smith

2005

Fatigue Fract Eng Mat Struct

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A B S T R A C T Experimental creep crack growth (CCG) test data are obtained by following standards that characterize CCG rates using the C * parameter. Such data are then used in hightemperature failure assessment procedures. An alternative approach to defect assessment at high-temperature failure is an extension of the R6 failure assessment diagram (FAD). At high temperature, creep toughness, K c mat , can be estimated from CCG tests and replaces low-temperature toughness in R6. This approach has the advantage that it is not necessary to establish a creep fracture regime, such as small-scale, primary or widespread creep. Also, a new strain-based FAD has been developed, potentially allowing variations of stress and temperature to be accommodated. In this paper, the results of a series of crack growth tests performed on ex-service 316H stainless steel at 550 • C are examined in the light of the limitations imposed by ASTM for CCG testing. The results are then explored in terms of toughness and presented in FADs.Keywords creep crack growth; failure assessment diagram; material toughness; strain based. I N T R O D U C T I O NCreep-ductile materials are used extensively in the petroleum and power generation industries to fabricate pressurized equipment, such as piping and pressure vessels. These materials are usually tough and ductile at lower temperatures and retain good strength at high temperatures. Many austenitic and ferritic steels exhibit creepductile behaviour, and typically, these materials have ductilities that exceed 20%. Extensive experimental and theoretical studies on creep crack growth (CCG) have been carried out generally on materials that show considerable creep ductility. Materials classified as creep-ductile have the ability to sustain significant amounts of deformation prior to crack growth and final failure.In contrast, creep-brittle materials are more resistant to creep deformation, and their creep ductility is relatively low. However, in the next generation of power plants there is the need to reduce CO 2 emission and limit the use of natural resources, and this has provided an additional incentive to increase efficiency. 1 The main enabling technology is the development of stronger high-temperature materials, capable of operating under high stresses at ever increasing temperatures. Many of these advanced materials applicable to such operations are creep-brittle. Other

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Section: Methodssupporting

confidence: 67%

Section: Characterization Of Ccgsupporting

confidence: 69%

Section: Methodsmentioning

confidence: 99%

“…Similar results were also found for other tests and are examined in detail in Fookes. 17 Therefore, it would not be valid to use data shown in Fig. 4b to correlate CCG rate using C * .…”

Section: Characterization Of Ccgmentioning

confidence: 99%

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A new method for assessing high‐temperature crack growth

Fookes

Smith

2005

Fatigue Fract Eng Mat Struct

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“…Fracture mechanics approaches have been previously used to characterize creepfatigue crack growth rate in creep-ductile power plant materials. The most of these studies [2,[5][6][7] performed using compact tension C(T) specimens demonstrated that C(t)/C*-integral to be effective crack tip parameter in correlating creep-fatigue crack growth rates in such materials. The steady-state of experimental correlations of creep-fatigue initiation and growth using fracture mechanics parameters are obtained from laboratory tests and at stress levels well above those relevant to service conditions.…”

Section: Introductionmentioning

confidence: 99%