Finite element analysis of creep using Theta projection data

Law, Michael R.; Payten, W.; Snowden, K. U.

doi:10.1016/s0308-0161(98)00038-6

Cited by 14 publications

(7 citation statements)

References 3 publications

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“…The analyzed results of A, B, θ3 and θ4 are plotted in Figure 6. It is well known that there exists a linear relationship between the theta parameters and applied stress in the θ projection method [19]. A similar analysis is also completed here, which indicates that a similar linear relationship can also be found between the composite model parameters and applied stress as follows: With the increase of stress, the log(A), log(θ3), log(θ4) increase and the log(B) decreases.…”

Section: The Composite Model Analysissupporting

confidence: 77%

Application of a Composite Model in the Analysis of Creep Deformation at Low and Intermediate Temperatures

Yang

Ling

2017

Journal of Engineering Materials and Technology

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The creep behaviors of TA2 and R60702 at low and intermediate temperature were presented and discussed in this paper. Experimental results indicated that an apparent threshold stress exhibited in the creep deformation of R60702. Meanwhile, the primary creep phase was found as the main pattern in the room temperature creep behavior of TA2. Compared with exponential law, the power law has been proved to be a proper constitutive model in the description of primary creep phase. It also showed that θ projection method had its significant advantage in the evaluation of accelerated creep stage. Thus, a composite model which combined power law with θ projection method was applied in the creep curves evaluation at low and intermediate temperature. Based on the multiaxial creep deformation results, the model was modified and discussed. A linear relationship existed between composite model parameters and applied load. Finally, the creep life could be accurately predicted and the composite model method is suitable for application in low and intermediate temperature creep life analysis.

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Section: The Composite Model Analysissupporting

confidence: 77%

Application of a Composite Model in the Analysis of Creep Deformation at Low and Intermediate Temperatures

Yang

Ling

2017

Journal of Engineering Materials and Technology

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“…Currently, the prime control on creep life has been evaluated through a reference or representative rupture stress approach and this is consistent with the normal design rules followed for creeping components. However, a strain-based failure criterion is possible where the theta damage constitutive laws are used [81,82]. Such an approach would be compatible with some of the more practical data available but the method has not been as extensively studied as the stress-based approaches.…”

Section: Discussionmentioning

confidence: 99%

“…However, the multi-axial relationships only involved maximum principal or equivalent stress control. More recently, the approach has been applied to the performance of plain pipes [82], again using a single stress failure criterion. The application of the theta method, which incorporates multi-axial effects [83], has been successfully applied to the analysis of notched creep tests.…”

Section: Life Prediction Using Damage Modellingmentioning

confidence: 99%

Creep analysis of pressurized circumferential pipe weldments—a review

Hyde

Sun

Williams³

2003

The Journal of Strain Analysis for Engineering Design

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This paper reviews work related to the high-temperature creep analysis of pressurized circumferential pipe weldments. It is important to define the problem and thus metallurgical features correctly; the identification of material microstructural-property variations within the heat-affected zone (HAZ) and the failure modes of welds are briefly included, as well as in-service experience of pipe welds. Experimental methods, including model and full-size component testing, are summarized and examples of typical tests results are described. Material constitutive equations, which can be used in describing the creep deformation of and failure mechanisms in welds, are briefly described. Numerical modelling using finite element (FE) methods, covering a range of approaches and analyses, taking account of the effects of material properties, pipe geometry, weld dimensions and system loading, on the stresses and failure behaviour of pipe weldments, are summarized. Typical results are presented to illustrate the potential uses and limitations of the FE methods.

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“…Second, the theta projection model allows estimates of the minimum creep rate, while few other available equation systems accurately describe creep curves. Finally, the theta projection model can be applied to produce a reliable estimation of the rupture life of a material subjected to creep 31,32 . Although several studies used existing models for predicting the creep life in the case of austenitic stainless steels, 7,14,33,34 there still seems to be a lack of a detailed investigation in the case of modeling the creep behavior of AISI 347 employing theta projection model.…”

Section: Introductionmentioning

confidence: 99%

Design of a novel creep testing machine to investigate the creep life history of austenitic steel foil at elevated temperature

Nejad

AL‐Fatlwe

Koloor

et al. 2022

Fatigue Fract Eng Mat Struct

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A novel creep testing machine was designed to test austenitic steel foil AISI 347 under the elevated temperature of 700 C. The creep test was repeated in five stress levels from low-stress 55 MPa to severe applied stress 220 MPa for 0.25 mm thickness samples. The machine was equipped with a shield inert gas injection system, and tests were repeated in a nonoxidative area. The creep rupture behavior of the foil is well represented using the modified threeparameter Theta Projection Concept model. Each model parameter is best represented as a function of the applied stress. Comparison between the results of creep life in different mediums shows that the oxidation effect was the dominant phenomenon in the creep process. Moreover, avoiding oxidation affects the steady-state stage growth, and afterward, the creep life was increased by more than 40%. Post analyses of ruptured creep samples compare the creep cavitation at triple grain boundaries in a different environment.

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Finite element analysis of creep using Theta projection data

Cited by 14 publications

References 3 publications

Application of a Composite Model in the Analysis of Creep Deformation at Low and Intermediate Temperatures

Application of a Composite Model in the Analysis of Creep Deformation at Low and Intermediate Temperatures

Creep analysis of pressurized circumferential pipe weldments—a review

Design of a novel creep testing machine to investigate the creep life history of austenitic steel foil at elevated temperature

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