Structural analysis of a power plant component using a stress-range-dependent creep-damage constitutive model

Naumenko, Konstantin; Kostenko, Yevgen

doi:10.1016/j.msea.2008.04.096

Cited by 37 publications

(16 citation statements)

References 11 publications

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“…By using the constitutive Equation 13, as well as damage models Equations 16 and 29 directly into the FEM ratedependent formulation and using an explicit time integration procedure, we obtain a standard Runge-Kutta integration scheme wherein the FE stiffness matrix is derived from the elastic moduli. Thus, to determine the numerical stress or strain rate fields, we need to first determine the damage rate function by substituting the stress obtained in the initial iteration into Equations 16 and 29 for stress-and ductility-based models, respectively.…”

Section: Computational Resultsmentioning

confidence: 99%

“…In this context, the previous stress‐based model proposed by Hayhurst and ductility‐based models proposed by Cocks and Ashby and Bendick were used. Generally, in the classical and modern models, the effects of multiaxial states of stress on the creep damage accumulation and growth are considered …”

Section: Introductionmentioning

confidence: 99%

“…Generally, in the classical and modern models, the effects of multiaxial states of stress on the creep damage accumulation and growth are considered. 7,8,[10][11][12][13][14] Hutchinson 4 proposed a multiaxial constitutive law for creep strain rate, which is based on the micromechanical considerations. Subsequently, for a structural material undergoing grain boundary cavitation, a potential function initially introduced by Hutchinson 4 was summarized by Bassani and Hawk 15 in a general form, which includes many of the previously proposed creep damage equations.…”

Section: Introductionmentioning

confidence: 99%

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Creep‐fracture resistance parameters determination based on stress and ductility damage models

Shlyannikov

Tumanov

2018

Fatigue Fract Eng Mat Struct

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The stress, strain rate, and process zone with respect to the creep‐crack growth in pure modes I and II are analysed by using damage‐evolution equations. The damage models for the fracture of the process zone are represented using a stress‐ and ductility‐based formulation. According to the stress‐based model, 2 expressions are proposed to describe the stress‐sensitive nature of a multiaxial rupture behaviour. Following the ductility model, new multiaxial failure strain conditions are derived. Both damage‐free and defective creeping solids have been studied. The variations in the creep stress or strain and crack‐tip governing parameter in terms of the creep In‐integral with respect to time and the evolution of creep damage are analysed using a finite element model. The effect of the introduced creep stress intensity factor as a function of the creep time, loading biaxiality, and creep damage models is discussed in detail.

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Section: Computational Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Creep‐fracture resistance parameters determination based on stress and ductility damage models

Shlyannikov

Tumanov

2018

Fatigue Fract Eng Mat Struct

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“…Recent studies have focused on the analysis and simulation of creep problems for practical structures using the above constitutive models. 18,19 However, the evaluation of creep damage of materials under variable load conditions is still an urgent problem to be solved. 20 To solve this problem, many researchers have proposed different damage accumulation models.…”

Section: Introductionmentioning

confidence: 99%

A new creep damage assessment method for metallic material under variable load conditions at elevated temperature

Ma³

et al. 2019

Fatigue Fract Eng Mat Struct

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It is significant for structural design and maintenance to assess behaviour and life under varying load conditions. For structures operating in high‐temperature environments, creep is one mechanism responsible for material failures. In this paper, different damage accumulation rules were reviewed, and a new creep damage assessment method was proposed based on the creep damage tolerance parameter λ and load factor Φ. By introducing the creep damage tolerance parameter λ and the minimum creep rate, the loading process and creep behaviour of the material are taken into account in a damage assessment. The parameters in the model can be obtained by the simple variable load creep test, and the remaining life and strain can be predicted using uniaxial creep test data. To analyse the applicability and accuracy of this new model, the strain histories, the life of step load, and the constant load creep from experiments on a titanium alloy at 500°C were obtained, and the prediction results of the novel and previous methods were carefully investigated.

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“…Thus the damage was not related to the whole structure and finally the elastic part of structure kept the entire load. The example of the failure assessment was the creep analysis of the valve shown in [14]. The secondary and tertiary creep was analyzed.…”

Section: Introductionmentioning

confidence: 99%

Fe Analysis of a Steam Turbine HP Rotor Blade Stage Concerning Material Effort, Dynamic Properties and Creep Damage Assessment

Borkowski

Głowacki

Nowakowska

et al. 2016

Archive of Mechanical Engineering

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This paper is concerned with the 1 st stage of HP rotor blade assembly steam turbine TK 120. The methodology was focused on the selection of mechanical properties and the way of the rotor disc modeling and estimating the degree of damage caused by creep. Then the dynamic interference between the frequencies of excitation and the natural frequencies was assessed. Static calculations were performed for the cyclic sectors consisting of the disc, disc blades, spacers and shrouding, including loads as temperature, mass forces from the angular velocity and the pressure on the blades. Then, the creep analysis using a Norton's model and the modal analysis were performed. Static analysis gave information concerning the distributions of displacements, stress and strain components. In the creep analysis, the creep displacements and stress relaxation versus time were determined and the estimated degree of damage caused by creep was evaluated at each part of the rotor disc. In the modal analysis, the natural frequencies and modes of vibrations corresponding to the nodal diameters were found. The results of modal analysis were shown in the SAFE graph. Numerical calculations have shown that the rotor disc was a well-designed structure and did not reveal any dynamic interference.

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Structural analysis of a power plant component using a stress-range-dependent creep-damage constitutive model

Cited by 37 publications

References 11 publications

Creep‐fracture resistance parameters determination based on stress and ductility damage models

Creep‐fracture resistance parameters determination based on stress and ductility damage models

A new creep damage assessment method for metallic material under variable load conditions at elevated temperature

Fe Analysis of a Steam Turbine HP Rotor Blade Stage Concerning Material Effort, Dynamic Properties and Creep Damage Assessment

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