UNIFIED VISCOPLASTIC MODEL COUPLED WITH DAMAGE FOR EVALUATION OF CREEP-FATIGUE OF GRADE 91 STEEL

被引：0
|
作者：
Islam, Nazrul [1 ]
Dewees, David J. [2 ]
Hassan, Tasnim [1 ]
机构：
[1] North Carolina State Univ, Raleigh, NC 27607 USA
[2] Babcock & Wilcox Co, Barberton, OH 44203 USA
来源：
PROCEEDINGS OF THE ASME PRESSURE VESSELS AND PIPING CONFERENCE, 2017, VOL 6A | 2017年
关键词：
Continuum Damage Mechanics; Unified Viscoplastic Model; MPC-Omega; Creep-Fatigue; TMF; LMP Rupture Life;
D O I：
暂无
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
A continuum damage mechanics (CDM) coupled unified viscoplasticity model has been developed to predict the creep fatigue life of modified Grade 91 steel. A tertiary creep model termed MPC-Omega codified in Part 10 of API (and also implemented in the ASME BP&V Code for Grade 22V and more recently Grade 91 Steel) is also employed for creep damage evaluation. As MPC-Omega has a direct relationship with Larson-Miller parameter (LMP) coefficients, creep damage coefficients in the unified constitutive model (UCM) are tied with MPC-Omega coefficients in order to utilize WRC and API 579-1 Grade 91 creep rupture database. The model is validated against long-term creep, LCF, creep-fatigue and TMF experimental responses at T = 20-600 degrees C.
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页数：9
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