scholarly journals Damage modelling: the current state and the latest progress on the development of creep damage constitutive equations for high Cr steels

2017 ◽  
Vol 34 (3) ◽  
pp. 229-237 ◽  
Author(s):  
Qiang Xu ◽  
Zhongyu Lu ◽  
Xue Wang
Keyword(s):  
Constitutive Equations ◽  
Creep Damage ◽  
Current State ◽  
Damage Modelling ◽  
Cr Steels

scholarly journals Review on the Current State of Developing of Advanced Creep Damage Constitutive Equations for High Chromium Alloy

2012 ◽  
Vol 510 ◽  
pp. 776-780 ◽  
Author(s):  
Li Li An ◽  
Qiang Xu ◽  
Dong Lai Xu ◽  
Zhong Yu Lu
Keyword(s):  
Constitutive Equations ◽  
Creep Damage ◽  
Chromium Alloy ◽  
High Chromium ◽  
Current State ◽  
Specific Material ◽  
Future Work

This paper presents a review of developing of creep damage constitutive equations for high chromium alloy (such as P91 alloy). Firstly, it briefly introduces the background of creep damage for P91 materials. Then, it summarizes the typical creep damage constitutive equations developed and applied for P91 alloy, and the main deficiencies of KRH (Kachanov-Robatnov-Hayhurst) type and Xus type constitutive equations. Finally it suggests the directions for future work. This paper contributes to the knowledge for the developing creep damage constitutive equations for the specific material.

Current State of Developing Creep Damage Constitutive Equation for 0.5Cr0.5Mo0.25V Ferritic Steel

2012 ◽  
Vol 510 ◽  
pp. 812-816 ◽  
Author(s):  
Qi Hua Xu ◽  
Qiang Xu ◽  
Yong Xin Pan ◽  
Michael Short
Keyword(s):  
Stainless Steel ◽  
Constitutive Equation ◽  
Literature Review ◽  
Constitutive Equations ◽  
Ferritic Steel ◽  
Creep Damage ◽  
Current State ◽  
Future Work

This paper reports a critical summary of literature review of creep damage constitutive equations. Firstly, it introduces the general background on the creep damage in low alloy stainless steel and weldment. Then, it summarizes the typical creep damage constitutive equations for this material available from public literature and discusses the deficiencies existed in the popular creep damage constitutive equations. Finally it outlines the approach to be used in the developing a new set of creep damage constitutive equation and the directions of future work.

Finite Element Simulation of the Creep Behavior of 2.25Cr-1Mo-0.25V Steel Based on Continuum Damage Mechanics

2015 ◽  
Vol 750 ◽  
pp. 266-271 ◽  
Author(s):  
Yu Zhou ◽  
Xue Dong Chen ◽  
Zhi Chao Fan ◽  
Yi Chun Han
Keyword(s):  
Genetic Algorithm ◽  
Finite Element ◽  
Creep Behavior ◽  
Constitutive Equations ◽  
Damage Evolution ◽  
Damage Mechanics ◽  
Creep Damage ◽  
Continuum Damage Mechanics ◽  
Continuum Damage ◽  
Element Simulation

The creep behavior of 2.25Cr-1Mo-0.25V ferritic steel was investigated using a set of physically-based creep damage constitutive equations. The material constants were determined according to the creep experimental data, using an efficient genetic algorithm. The user-defined subroutine for creep damage evolution was developed based on the commercial finite element software ANSYS and its user programmable features (UPFs), and the numerical simulation of the stress distribution and the damage evolution of the semi V-type notched specimen during creep were studied. The results showed that the genetic algorithm is a very efficient optimization approach for the parameter identification of the creep damage constitutive equations, and finite element simulation based on continuum damage mechanics can be used to analyze and predict the creep damage evolution under multi-axial stress states.

Representation of Mechanical Behavior in the Presence of Changing Internal Structure

1988 ◽  
Vol 55 (1) ◽  
pp. 1-10 ◽  
Author(s):  
E. T. Onat ◽  
F. A. Leckie
Keyword(s):  
Mechanical Behavior ◽  
Internal Structure ◽  
Applied Stress ◽  
Constitutive Equations ◽  
Creep Damage ◽  
Main Ideas ◽  
The Relationship ◽  
Small Deformations

The paper is concerned with the representation of the relationship that exists, for a given material and temperature and for small deformations, between histories of applied stress and the observed strain and the accompanying changes in internal structure of the material. Emphasis is given to creep damage in metals as a vehicle for illustration of the main ideas introduced in the paper. In particular, the role played by irreducible even rank tensors in the representation of internal structure is discussed and clarified. The restrictions placed by thermodynamics on constitutive equations are considered and the use of potentials in these equations is examined and criticized.

Preliminary Review of the Influence of Cavitation Behavior in Creep Damage Constitutive Equations

2014 ◽  
Vol 940 ◽  
pp. 46-51 ◽  
Author(s):  
Xin Yang ◽  
Qiang Xu ◽  
Zhong Yu Lu ◽  
Simon Barrans
Keyword(s):  
Reference Value ◽  
Creep Damage ◽  
Preliminary Review ◽  
Current Application ◽  
Cavitation Damage ◽  
X Ray ◽  
Creep Cavitation ◽  
Cr Steels ◽  
Cavitation Behavior ◽  
Damage Equation

This review paper mainly consists of from two aspects: (a) the evolution of the cavitation damage equation from Dyson to current application in high Cr steels by traditional techniques; (b) quantitation analyses of cavitation behavior in brass, copper, dual phase steel from X-ray microtomtograph. Though there is a lack of experimental data for high Cr steels by X-ray microtomography currently, but (b) has provided reference value for studying creep cavitation behavior in high Cr steels. This paper will be the fundamental of development new creep damage constitutive equation through quantitation analyses of X-ray tomography.

scholarly journals The development of creep damage constitutive equations for high Cr steel

2020 ◽  
Vol 37 (2) ◽  
pp. 129-138 ◽  
Author(s):  
Xuming Zheng ◽  
Qiang Xu ◽  
Zhongyu Lu ◽  
Xue Wang ◽  
XiQiao Feng
Keyword(s):  
Constitutive Equations ◽  
Creep Damage

Deformation and damage of nuclear power station fuel elements under cyclic loading

2019 ◽  
Vol 54 (5-6) ◽  
pp. 348-359
Author(s):  
Dmitry Breslavsky ◽  
Aleksandr Chuprynin ◽  
Oleg Morachkovsky ◽  
Oksana Tatarinova ◽  
Will Pro
Keyword(s):  
Cyclic Loading ◽  
Fuel Element ◽  
Nuclear Power Station ◽  
Constitutive Equations ◽  
Nuclear Power ◽  
Creep Damage ◽  
Creep Model ◽  
Power Station ◽  
Station Fuel ◽  
Power Station Fuel

Deformation and damage of nuclear power station fuel element shells under irradiation and cyclic loading due vibrations are studied. Constitutive equations include dependencies for a creep-damage equation with a scalar damage parameter, as well as terms for thermal and irradiation creep strains, elastic, thermal, and swelling strains. The acceleration of the creep-damage process due to cyclic variation of internal pressure is considered with a dynamic creep model, for which constitutive equations are derived using the method of asymptotic expansions and averaging over a period of cyclic loading. Stress and strain states in the fuel element shell are determined by use of an in-house finite element method creep-damage code for shells of revolution. Results show the essential variation in the initially symmetric fuel element shell form, as well as the acceleration of creep-damage processes due to the cyclic pressure.

Creep damage and expected creep life for welded 9–11% Cr steels

2007 ◽  
Vol 84 (1-2) ◽  
pp. 69-74 ◽  
Author(s):  
P. Auerkari ◽  
S. Holmström ◽  
J. Veivo ◽  
J. Salonen
Keyword(s):  
Creep Damage ◽  
Creep Life ◽  
Cr Steels
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