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.

引用

页数：9

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