Analysis of Irradiation Swelling and Irradiation Creep Models with the Stress Effect Account in the Problems of Inelastic Strain Mechanics. Part 1. Formulation of Constitutive Equations

2021 ◽  
Author(s):  
O. Yu. Chirkov
Keyword(s):  
Constitutive Equations ◽  
Inelastic Strain ◽  
Stress Effect ◽  
Irradiation Creep ◽  
Creep Models

Progress in Developing Constitutive Equations for Inelastic Design Analysis

1983 ◽  
Vol 105 (3) ◽  
pp. 273-276 ◽  
Author(s):  
C. E. Pugh
Keyword(s):  
Constitutive Equations ◽  
Inelastic Strain ◽  
Short Term ◽  
Inelastic Material ◽  
Fast Breeder Reactors ◽  
Breeder Reactors ◽  
Term Creep ◽  
Inelastic Design ◽  
Creep Deformations

A summary is given of the constitutive equations that have been developed for use in design assessments of elevated temperature components of liquid metal fast breeder reactors. The discussion addresses representations of short-term (plastic) and long-term (creep) inelastic material responses. Attention is given to improved representations of the interactions between plastic and creep deformations. Most of the discussion is in terms of constitutive equations that make use of the concept of separating the total strain into elastic, plastic, and creep portions. Additionally, some discussion is given of progress being made toward establishing design equations based on unified measures of inelastic strain that do not distinguish different strain portions.

Using rate theory to better understand the stress effect of irradiation creep in iron and its based alloy

2020 ◽  
Vol 536 ◽  
pp. 152198
Author(s):  
Sang Il Choi ◽  
Mosab Jaser Banisalman ◽  
Gyeong-Geun Lee ◽  
Junhyun Kwon ◽  
Eisung Yoon ◽  
...  
Keyword(s):  
Rate Theory ◽  
Stress Effect ◽  
Irradiation Creep

Irradiation creep models — an overview

1988 ◽  
Vol 159 ◽  
pp. 257-285 ◽  
Author(s):  
J.R. Matthews ◽  
M.W. Finnis
Keyword(s):  
Irradiation Creep ◽  
Creep Models

Study on the Creep Parameters of Salt Rock Constitutive Function

2014 ◽  
Vol 1079-1080 ◽  
pp. 166-169 ◽  
Author(s):  
Hai Peng Zhang ◽  
Yi Jin ◽  
Long Ma
Keyword(s):  
Constitutive Model ◽  
Creep Test ◽  
Constitutive Equations ◽  
Determination Method ◽  
Salt Rock ◽  
Constitutive Function ◽  
Rock Creep ◽  
Creep Models ◽  
Creep Constitutive Model

Salt rock is a kind ofthe most suitablemedium for energy storages, because of its strongcreep behavior. "Burgers" and "Norton" is the two classic creep models. This paper starts from the establishment of creep constitutive model to obtain the determination method of creep constitutive parameters.Finally, it takes Nanjing salt rock creep test (2003) as an example to solve the parameters in Burgers and Norton constitutive equations.

Constitutive equations for creep

1994 ◽  
Vol 29 (3) ◽  
pp. 167-175 ◽  
Author(s):  
P S White ◽  
A M Goodman
Keyword(s):  
Strain Hardening ◽  
Constitutive Equations ◽  
Back Stress ◽  
Point Of View ◽  
Advantages And Disadvantages ◽  
Classical Formulation ◽  
Hardening Models ◽  
Practical Engineering ◽  
Creep Models ◽  
Stress Models

Creep constitutive equations are discussed in their role as material descriptions forming one of the governing conditions of an inelastic stress analysis. The view taken is that they must not only give an adequate picture of the material behaviour itself, but must also be suitable from the numerical point of view. Furthermore, in practical engineering contexts, constitutive equations must be principally aimed at giving information for structural assessment under realistic loading conditions and subject to various uncertainties. The choice of model is, therefore, not aimed at an exact material description, and the practial choice may be problem-dependent for a given material. Both the classical formulation and the more recent unified formulation are outlined, with discussion of advantages and disadvantages. Some unified formulations are regarded as practically useful but great use is still to be expected of classical forms in which creep and plasticity are regarded as separate. In the latter class descriptions are given of the widely-employed time- and strain-hardening descriptions, of back-stress models, and of certain tertiary creep models including damage variables. The difficulties of anisotropy are also noted. Finally the paper discusses the process of fitting material data to the classical time- and strain-hardening models, and some hints are given for the analyst who may be faced with performing this task for materials of interest.

Prediction of Tread Pattern Wear by an Explicit Finite Element Model3

2007 ◽  
Vol 35 (4) ◽  
pp. 276-299 ◽  
Author(s):  
J. C. Cho ◽  
B. C. Jung
Keyword(s):  
Finite Element ◽  
Wear Rate ◽  
Tangential Stress ◽  
Rate Equation ◽  
Constitutive Equations ◽  
Slip Velocity ◽  
Test Results ◽  
Explicit Finite Element ◽  
Driving Condition ◽  
Driving Conditions

Abstract Tread pattern wear is predicted by using an explicit finite element model (FEM) and compared with the indoor drum test results under a set of actual driving conditions. One pattern is used to determine the wear rate equation, which is composed of slip velocity and tangential stress under a single driving condition. Two other patterns with the same size (225/45ZR17) and profile are used to be simulated and compared with the indoor wear test results under the actual driving conditions. As a study on the rubber wear rate equation, trial wear rates are assumed by several constitutive equations and each trial wear rate is integrated along time to yield the total accumulated wear under a selected single cornering condition. The trial constitutive equations are defined by independently varying each exponent of slip velocity and tangential stress. The integrated results are compared with the indoor test results, and the best matching constitutive equation for wear is selected for the following wear simulation of two other patterns under actual driving conditions. Tens of thousands of driving conditions of a tire are categorized into a small number of simplified conditions by a suggested simplification procedure which considers the driving condition frequency and weighting function. Both of these simplified conditions and the original actual conditions are tested on the indoor drum test machines. The two results can be regarded to be in good agreement if the deviation that exists in the data is mainly due to the difference in the test velocity. Therefore, the simplification procedure is justified. By applying the selected wear rate equation and the simplified driving conditions to the explicit FEM simulation, the simulated wear results for the two patterns show good match with the actual indoor wear results.

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