Crack growth behavior of 9Cr−1Mo (P91) steel under creep–fatigue conditions

Narasimhachary, Santosh B.; Saxena, Ashok

doi:10.1016/j.ijfatigue.2013.07.006

Cited by 77 publications

(51 citation statements)

References 15 publications

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“…n s (2) where I n is numerical constant which depends on the creep exponent, n, and out of plane stress state (plane stress vs. plane strain), L -is a crack characteristic length which can be taken as crack depth, specimen width, unit 1 cm and so on. As a consequence, stress, strain and displacement rate for power-law creeping materials can be written as…”

Section: Hrr-type Leading-term Singularity Fieldmentioning

confidence: 99%

“…Considerable studies devoted to creep-fatigue interaction of power plant component materials in the past have already been carried out [1][2][3][4][5]. Fracture mechanics approaches have been previously used to characterize creepfatigue crack growth rate in creep-ductile power plant materials.…”

Section: Introductionmentioning

confidence: 99%

“…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%

See 2 more Smart Citations

A creep stress intensity factor approach to creep–fatigue crack growth

Shlyannikov

Tumanov

Boychenko

2015

Engineering Fracture Mechanics

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Section: Hrr-type Leading-term Singularity Fieldmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A creep stress intensity factor approach to creep–fatigue crack growth

Shlyannikov

Tumanov

Boychenko

2015

Engineering Fracture Mechanics

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“…Most importantly in Low Cycle Fatigue (LCF) and Thermomechanical Fatigue (TMF) where is has been shown that non-uniform crack growth can be prevalent and the measurement of these can be difficult. [8] Quite often efforts are made to stop tunnelling occurring in the test, by modified specimen geometries [9], interrupting the test to put different loading on the sample which has been shown to return the crack to a uniform shape or post processing to try to understand the stress intensity factor [10]. Current work however is not being undertaken in live crack growth experiments, efforts are concentrating on characterising response using a range of samples with known shape.…”

Section: Introductionmentioning

confidence: 99%

Development of a technique for the real-time determination of crack geometries in laboratory samples

et al. 2018

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Abstract.Crack size determination using electrical potentials both in service and in the laboratory has been undertaken for many years. In the laboratory this has mainly concentrated on the measurement of crack depth, with either alternating current (AC) or direct current (DC) supplies. Some work to determine the varying depth along the width of cracks as an inspection tool of in service parts using mapping methods has been done. This has used both AC and DC utilising various models to understand the data recorded, in Alternating Current Potential Drop (ACPD) a range of frequencies have been used to give various skin depths.The resulting analyses have been grouped into two groups 'thin skin' and 'thick skin', in the thin skin case the skin depth is significantly smaller than the depth of the crack 1/10th of the crack depth whereas in the thick skin cases are for cases where skin depth is over this limit. Some work has been carried out to try and unify these two approaches.The work presented here looks to develop a method using variable frequency ACPD to resolve further information about cracks growing in laboratory specimens. A system has been developed to rapidly sweep a wide frequency band and record voltage drop across a crack or feature. A selection of steel samples with known geometries and features have been used to trial and benchmark the technique. These samples have a range of cross sections as well as machined features or a range of shapes and sizes to simulate a range of crack geometries. This work has been approximated using a 2D computational model. This has been done using a reduced thickness approach. 165, 09004 (2018) MATEC Web of Conferences

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“…Among the new materials for applications in power plants, modified P91 steel has been widely adopted due to its excellent mechanical properties at elevated temperatures, combined with good workability and weldability [1][2][3][4][5][6] . As welding is one of the main industrial processes for fabrication of structures and pipelines, the knowledge of residual stress (RS) induced by this process is extremely important because the mechanical properties of the welded components, such as fatigue and thermal fatigue resistance, are not only determined by the microstructures present in the joint, but also by residual stresses heterogeneously introduced in the thermal cycle during the process 7,8 .…”

Section: Introductionmentioning

confidence: 99%