Over the past ten years significant progress has been made towards reliable methods for creep life assessment. Through development and application, methods are now at a stage at which their technical viability is established and the cost benefits are proven at the plant operation, maintenance, and strategic planning levels. This paper reviews creep life assessment methods with particular reference to those based on component strain measurement. It is concluded that, through validation, standardization, and data/knowledge banking, consolidation of the substantial amount of information now available must be an objective for the next 5–10 years, whilst not curtailing innovative development.
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References
1.
CaneB. J.AplinP. F.Creep life assessment methods. Proceedings of the 1993 Pressure Vessels and Piping Conference, 1993, pp. 25–29.
2.
CaneB. J.Estimating the remanent creep life of power plant components, High Temp. Technol., 1983, 1, 215.
3.
AshbyM. F.DysonB. F.NPL Report DMA(A) 77, 1984, National Physical Laboratory.
4.
TimminsR.AplinP. F.Long term creep ductility minima in 12%CrMoV steel. Mechanics of creep brittle materials 2, (Edited by CocksA. C. F.PonterA. R. S.), 1991, (Elsevier Science Publishers).
5.
AplinP. F.BulloughC. K.BarlowD. J.The long-term rupture ductility behaviour of 12 CrMoV tubing steels, Proceedings of the Conference on Rupture Ductility of Creep Resistant Steels, 1990, (Institute of Metals).
6.
ToftL. H.MarsdenR. A.Conference on Structural Processes in Creep, 1983, (Institute of Metals, Iron and Steel Institute), p. 276.
7.
CaneB. J.WilliamsK. R.Creep damage accumulation and life assessment of a 0.5Cr … 0.5Mo … 0.25V steel, Conference on Mechanical Behaviour of Materials, ICM 3, 1979, 255–264.
8.
CaneB. J.Damage accumulation and failure criteria in creep brittle ferritic weldment structures, Proceedings of Conference on Welding Technology for Energy Applications, 1982, (American Weldng Society, USA).
9.
LaiJ. K.WickensA.Microstructural changes and variations in creep ductility of 3 casts of type 316 stainless steel, Acta Met., 1979, 27, 217.
10.
HoffN. J.The necking and rupture of rods subjected to constant tensile loads, J. appl. Mech., 1953, 20, 1055.
11.
HartE. W.Theory of the tensile test, Acta Met., 1967, 15, 351–355.
12.
ThreadgillP. L.WilshireB.Creep strength of steels and high temperature alloys, The Metals Society Conference, 1974.
13.
HendersonP. J.McLeanM.Microstructural contributions to friction stress and recovery kinetics during creep of the nickel-base superalloy IN7 38LC. Acta Met., 1983, 31, 1203.
14.
DysonB. F.McLeanM.Particle coarsening sigma sub 0 and tertiary creep, Acta Met., 31, 1983, 17–27.
15.
SvensonL. E.DunlopG. L.Int. Met. Rev., 1980, 445.
16.
NeedhamN. G.CaneB. J.Creep strain and rupture predictions by cavitational assessment in 2.25Cr … 1Mo steel weldments, ASME Conference on Advances in Life Prediction Methods, 1983, 65–73.
17.
HollanK.Int. J. mech. Sci., 1975, 17, 369.
18.
SpeightM. V.BeereW.Vacancy potential and void growth on grain boundaries, Met. Sci., 1975, 9, 190.
DysonB. F.McLeanD.A new method of predicting creep life, Met. Sci. J., 1972, 6, 220–223.
22.
DysonB. F.International Conference on Creep and Fracture of Engineering Materials and Structures, (Edited by WilshireB.OwenD.), 1981, (Pineridge Press, Swansea) p. 235.
23.
BarracloughD. G.CaneB. J.VGB Conference on Assessment of Structural Components after being Subjected to Operating Stresses in the Creep Range, Essen, Germany, Feb. 1984.
24.
BorggreenK.HuntleyP.Second International Conference on Creep and Fracture of Engineering Materials and Structures, Part 2, (Pineridge Press, Swansea).
25.
ManningM. I.Corrosion and mechanical stress at high temperature, 1981, (Applied Science, London), p. 323.
26.
RiedelH.Met. Sci., 1982, 16, 659.
27.
HultJ.Topics in applied continuum mechanics, 1974, (Springer-Verlag, Berlin).
28.
RabotnovY. N.Creep rupture, Proceedings of the 12th International Union of theoretical and applied mechanics congress, 1969, (Springer-Verlag, Berlin), p. 342.
KachanovI. M.Ivz. Akad. Navk., 8, 1958, 27–31 (in Russia).
31.
CaneB. J.Remaining creep life estimation by strain assessment on plant, Int. J. Pressure Vessels Piping, 1982, 10, 11–30.
32.
CaneB. J.TownsendR. D.Prediction of remaining life in low-alloy steels, ASM Materials Science Seminar on Flow and Fracture at Elevated Temperatures, 1983, pp. 279–316.
33.
BrearJ. M.AplinP. F.Incorporating primary creep into the Kachanov-Rabotnov model — effect on rupture life and ductility prediction for ½CrMoV and 1CrMo steels, Proceedings of the Conference on Rupture Ductility of Creep Resistant Steels, (Edited by StrangA.), 1990, (Institute of Metals), pp. 88–102.
34.
BrearJ. M.AplinP. F.TownsendR. D.EggelerG.Improved continuum damage models for creep life predictions, Proceedings of the Sixth Int. Conference on Mechanical Behaviour of Materials - VI. ICM6, Vol. 3, (Edited by Masahiro Jono and Tatsuo Inove) (Pergamon Press, Oxford).
35.
BrearJ. M.AplinP. F.Incorporation of primary creep effects into the Kachanov Rabotnov continuum damage model for creep, Proceedings of the International Conferene on the Behaviour of Defects at High Temperatures, 1992, Paper 26b.
36.
OthmanA. M.HayhurstD. R.Multiaxial creep rupture of a model structure using a two-parameter material model, Int. J. mech. Sci., 1990, 32, 35–48.
37.
BurchJ. M.FarnoC.Precision and speed in close range photogrammetry, Proceedings of 12 PRS Commission V, 1982, pp. 90–99.
38.
EggelerG.MillwardC.CaneB. J.A. remanent life assessment technique based on local strain measurement using replication, Proceedings of the International Conference on Fossil Plant Rehabilitation, pp. 13–17.
39.
IshizakiS.KonnoK.MurayamaK.Nondestructive residual life evaluation techniques or boiler materials, International Conference on Life Assessment and Life Extension, 1988.
40.
Bohmvon W.WolfH.Material Prüf., 1976, 18, 457.
41.
DowneB. G.FidlerR.ProctorE.WilliamsJ. A.PhilippsL. S.NottingL. B.BSSM/SESA Conference on Measurements in Hostile Environments, 1981.
42.
WhukS. P.FosterR. L.Proceedings of the SESA Conference, 1981.
43.
HofstofferP.Proceedings of the VGB Conference on Assessment of Structural Components after being subjected to Operating Stresses in the Creep Range, 1984.
44.
WaltersD.Private Communication, 1991.
45.
ERA Technology, Fibre optics for remote monitoring of structures, 1991, (Publicity Leaflet).
