A new prediction model of stress relaxation from creep data in terms of average creep rate was established. An incremental calculation procedure has been further established to obtain stress relaxation data from creep data. To validate the effectiveness of the proposed conversion models, the predicted results were compared with those obtained by the previous continuum damage mechanics model as well as the stress relaxation experimental data using 1Cr10NiMoW2VNbN steel. Results showed that the creep–stress relaxation conversion model based on the average creep rate is better than that based on the continuum damage mechanics model because the former avoids the dispersion effect of fracture strain data, although the predicted results from the two models are both well in agreement with the experiment data.
WoodfordDA. Test methods for accelerated development, design and life assessment of high-temperature materials. Mater Design1993; 14(4): 231–241.
2.
BoseSCSinghKSwaminathanJ. Prediction of creep life of X10CrMoVNbN-91 (P-91) steel through short term stress relaxation test methodology. Mater Sci Tech2004; 20(10): 1290–1296.
3.
YamashitaMWadaY. The stress relaxation behavior of SUS 304 stainless steel. In: Collection and uses for relaxation data in design: ASME Pressure Vessels and Piping Conference-JSME Co-Sponsorship, Honolulu, Hawaii, July 23–27 1989, pp.15–19. New York: ASME.
4.
AotoKKoakutsuTWadaY. The prediction of the stress relaxation behavior of the high-temperature structural materials by creep-strain equations. In: International conference on creep, Tokyo, Japan, 14–18 April 1986, pp.495–500. JSME, IMechE, ASME, ASTM.
5.
KitadeSSetoguchicKYamauchiM. Cyclic stress-strain behavior of modified 9Cr-1Mo steel under creep-fatigue interaction. In: Collection and Uses for Relaxation Data in Design: ASME Pressure Vessels and Piping Conference-Jsme Co-Sponsorship, Honolulu, Hawaii, 23–27 July 1989, pp.35–41. New York, NY: ASME.
6.
ChabocheJL. A review of some plasticity and viscoplasticity constitutive equations. Int J Plasticity2008; 24: 1642–1693.
7.
NaumenkoKAltenbachHGorashY. Creep analysis with a stress range dependent constitutive model. Arch Appl Mech2009; 79: 619–630.
8.
BoyleJT. Stress relaxation and elastic follow-up using a stress range-dependent constitutive model. Proc IMechE, Part C: J Mechanical Engineering Science2012; 226(6): 1472–1483.
9.
EllisFVTordonatoS. Calculation of stress relaxation properties for type 422 stainless steel. J Press Vess: T ASME2000; 122(1): 66–71.
10.
OthmanAMHayhurstDR. Multi-axial creep rupture of a model structure using a two parameter material model. Int J Mech Sci1990; 32(1): 35–48.
11.
RaoGGuptaOPPradhanB. A new predictive method of stress relaxation behavior for high temperature structural materials. In: ECCC creep conference, Design & Life Assessment Issues, London, UK, 12–14 September 2005, pp.1023–1031.
12.
EvansRWWilshireB. Creep of metals and alloys. London: The Institute of Metals, 1985.
13.
SchlottnerGSeeleyRE. Estimation of the remaining life of high temperature steam turbine components. Int J Pres Ves Pip1985; 98(1): 35–44.
14.
GuoJQZhengXTZhangY. A unified continuum damage mechanics model for predicting the stress relaxation behavior of high-temperature bolting. J Pres Vess: T ASME2014; 136: 011203-1–011201-6.
DysonB. Use of CDM in materials modeling and component creep life prediction. J Press Vess: T ASME, 2000; 122(8): 281–296.
17.
MovaghgharALvovGI. A method of estimating wind turbine blade fatigue life and damage using continuum damage mechanics. Int J Damage Mech2012; 21(6): 810–821.
18.
JingJPMengGSunY. An effective continuum damage mechanics model for creep-fatigue life assessment of a steam turbine rotor. Int J Pres Ves Pip2003; 80(6): 389–396.
19.
YangJHsiaoJSFongM. The application of physically based CDM modeling in prediction of materials properties and component lifetime. J Press Vess: T ASME2004; 126(8): 369–375.
20.
TuST. High temperature structural integrity. Beijing, China: Science Press, 2003, pp.63–64.
21.
GuoJQXuanFZHeL. Stress relaxation performance and prediction models for bolt material of 1Cr10NiMoW2VNbN. Nucl Power Eng2008; 29(6): 119–124 (in Chinese).
22.
BoltonJ. In: StrangA (ed) Performance of Bolting Materials in High Temperature Plant Applications: Conference Proceedings. London, UK: IOM Communications Ltd, 1995.
