Notch-related weakening and strengthening behavior under creep–fatigue conditions was studied in terms of the elastic–viscoplasticity finite-element method (FEM). A coupled damage analysis, i.e., the skeletal point method for creep damage evaluation coupled with the equivalent strain range method for fatigue damage, was employed in the notch effect evaluation. The results revealed that, under the short holding time condition, a weakening behavior was observed for the notch, while a strengthening effect was detected with the increase of holding time. The difference could be ascribed to the creep damage contribution in the holding stage. The influence of stress concentration factor (SCF), stress ratio, and the maximum stress was strongly dependent on the competition of creep and fatigue mechanism.
Issue Section:
Materials and Fabrication
References
1.
Goyal
, S.
, Laha
, K.
, Das
, C. R.
, Panneerselvi
, S.
, and Mathew
, M. D.
, 2014
, “Effect of Constraint on Creep Behavior of 9Cr-1Mo Steel
,” Metall. Mater. Trans. A
, 45A
(2
), pp. 619
–632
.2.
Isobe
, N.
, Yashirodai
, K.
, and Murata
, K.
, 2014
, “Creep Damage Assessment for Notched Bar Specimens of a Low Alloy Steel Considering Stress Multiaxiality
,” Eng. Fract. Mech.
, 123
, pp. 211
–222
.3.
Yu
, Q. M.
, Wang
, Y. L.
, Wen
, Z. X.
, and Yue
, Z. F.
, 2009
, “Notch Effect and Its Mechanism During Creep Rupture of Nickel-Base Single Crystal Superalloys
,” Mater. Sci. Eng. A
, 520
(1–2), pp. 1
–10
.4.
Hyde
, T. H.
, Becker
, A. A.
, Song
, Y.
, and Sun
, W.
, 2006
, “Failure Estimation of TIG Butt-Welded Inco718 Sheets at 620 °C Under Creep and Plasticity Conditions
,” Comput. Mater. Sci.
, 35
(1
), pp. 35
–41
.5.
Goyal
, S.
, and Laha
, K.
, 2014
, “Creep Life Prediction of 9Cr-1Mo Steel Under Multiaxial State of Stress
,” Mater. Sci. Eng. A
, 615
, pp. 348
–360
.6.
Shi
, D. Q.
, Hu
, X. A.
, Wang
, J. K.
, and Huang
, J.
, 2013
, “Effect of Notch on Fatigue Behaviour of a Directionally Solidified Superalloy at High Temperature
,” Fatigue Fract. Eng. Mater. Struct.
, 36
(12
), pp. 1288
–1297
.7.
Chen
, Q.
, Kawagoishi
, N.
, and Nisitani
, H.
, 1999
, “Evaluation of Notched Fatigue Strength at Elevated Temperature by Linear Notch Mechanics
,” Int. J. Fatigue
, 21
(9
), pp. 925
–931
.8.
Bubphachot
, B.
, Watanabe
, O.
, Kawasaki
, N.
, and Kasahara
, N.
, 2011
, “Crack Initiation Process for Semicircular Notched Plate in Fatigue Test at Elevated Temperature
,” ASME J. Pressure Vessel Technol.
, 133
(3
), p. 031403
.9.
Berto
, F.
, Gallo
, P.
, and Lazzarin
, P.
, 2014
, “High Temperature Fatigue Tests of Un-Notched and Notched Specimens Made of 40CrMoV13.9 Steel
,” Mater. Des.
, 63
, pp. 609
–619
.10.
Sakane
, M.
, Ohnami
, M.
, Awaya
, T.
, and Shirafuji
, N.
, 1989
, “Frequency and Hold-Time Effects on Low Cycle Fatigue Life of Notched Specimens at Elevated Temperature
,” ASME J. Eng. Mater. Technol.
, 111
(1
), pp. 54
–60
.11.
Huang
, J.
, Yang
, X.
, Shi
, D.
, Yu
, H.
, Dong
, C.
, and Hu
, X.
, 2014
, “Systematic Methodology for High Temperature LCF Life Prediction of Smooth and Notched Ni-Based Superalloy With and Without Dwells
,” Comput. Mater. Sci.
, 89
, pp. 65
–74
.12.
Ponter
, A. R. S.
, Chen
, H.
, Willis
, M. R.
, and Evans
, W. J.
, 2004
, “Fatigue-Creep and Plastic Collapse of Notched Bars
,” Fatigue Fract. Eng. Mater. Struct.
, 27
(4
), pp. 305
–318
.13.
Feng
, L.
, and Xuan
, F. Z.
, 2015
, “Release and Redistribution of Residual Stress in the Welded Turbine Rotor Under Service-Type Loadings
,” Nucl. Eng. Des.
, 295
, pp. 500
–510
.14.
ASME
, 2015
, “ASME Boiler and Pressure Vessel Code, III-NH, Class 1 Components in Elevated Temperature Service
,” American Society of Mechanical Engineers, New York.15.
Jiang
, Y. P.
, Guo
, W. L.
, Yue
, Z. F.
, and Wang
, J.
, 2006
, “On the Study of the Effects of Notch Shape on Creep Damage Development Under Constant Loading
,” Mater. Sci. Eng. A
, 437
(2
), pp. 340
–347
.16.
Jiang
, Y. P.
, Guo
, W. L.
, and Yue
, Z, F.
, 2007
, “On the Study of the Creep Damage Development in Circumferential Notch Specimens
,” Comput. Mater. Sci.
, 38
(4
), pp. 653
–659
.17.
Xu
, X.
, Wang
, G. Z.
, Xuan
, F. Z.
, and Tu
, S. T.
, 2016
, “Effects of Creep Ductility and Notch Constraint on Creep Fracture Behavior in Notched Bar Specimens
,” Mater. High Temp.
, 33
(2
), pp. 198
–207
.18.
Telesman
, J.
, Gabb
, T. P.
, Ghosn
, L. J.
, and Gayda
, J.
, 2016
, “Effect of Notches on Creep-Fatigue Behavior of a P/M Nickel-Based Superalloy
,” Int. J. Fatigue
, 87
, pp. 311
–325
.19.
Nix
, W. D.
, Earthman
, J. C.
, Eggeler
, G.
, and IIschner
, B.
, 1989
, “The Principal Facet Stress as a Parameter for Predicting Creep Rupture Under Multiaxial Stresses
,” Acta Metall.
, 37
(4
), pp. 1067
–1077
.20.
Webster
, G. A.
, Holdsworth
, S. R.
, Loveday
, M. S.
, Nikbin
, K.
, Perrin
, I. J.
, Purper
, H.
, Skelton
, R. P.
, and Spindler
, M. W.
, 2004
, “A Code of Practice for Conducting Notched Bar Creep Tests and for Interpreting the Data
,” Fatigue Fract. Eng. Mater. Struct.
, 27
(4
), pp. 319
–342
.21.
Hayhurst
, D. R.
, 1972
, “Creep Rupture Under Multi-Axial States of Stress
,” J. Mech. Phys. Solids
, 20
(6
), pp. 381
–382
.22.
Cane
, B. J.
, 1981
, “Creep Damage Accumulation and Fracture Under Multiaxial Stresses
,” ICF5
, Cannes, France, pp. 1285
–1293
.23.
Dassault Systems
, 2011
, Abaqus 6.11 User's Manual, Dassault Systems SIMULIA
, Providence, RI
.24.
Wu
, D. L.
, Zhao
, P.
, Wang
, Q. Q.
, and Xuan
, F. Z.
, 2015
, “Cyclic Behavior of 9–12% Cr Steel Under Different Control Modes in Low Cycle Regime: A Comparative Study
,” Int. J. Fatigue
, 70
, pp. 114
–122
.25.
Wu
, D. L.
, Xuan
, F. Z.
, Guo
, S. J.
, and Zhao
, P.
, 2016
, “Uniaxial Mean Stress Relaxation of 9–12% Cr Steel at High Temperature: Experiments and Viscoplastic Constitutive Modeling
,” Int. J. Plast.
, 77
, pp. 156
–173
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