Modeling of cyclic thermo-elastic-plastic behaviour of P91 steel

Sulich, Piotr; Egner, Władysław; Mroziński, Stanisław; Egner, Halina

doi:10.15632/jtam-pl.55.2.595

Cited by 7 publications

(5 citation statements)

References 28 publications

(22 reference statements)

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“…1; cf. Sulich et al, 2017). The chemical composition of steel was 0.127 C, 0.442 Si, 0.489 Mn, 0.017 P, 0.005 S, 8,82 Cr, 0.971 Mo, 0.307 Ni, 0.012 Al, 0.017 Co, 0.036 Cu, 0.074 Nb, 0.004 Ti and 0.201 V. Low-cycle fatigue tests were strain controlled, with a constant total strain amplitude ε ac and a constant temperature θ in each test.…”

Section: Materials Behaviourmentioning

confidence: 99%

“…The thermodynamic forces conjugated to state variables (1) result from the assumed form of the state potential, which is here the Helmholtz free energy , decomposed into thermoelastic and thermoplastic parts (Sulich et al, 2017). In the present analysis, the following state equations define the thermodynamic forces:…”

Section: State Equationsmentioning

confidence: 99%

“…There is also a decrease in dislocation density (Nagesha et al, 2002). As a consequence of these microstructural rearrangements, the 9%-12% Cr steels commonly exhibit cyclic softening (Kyaw et al, 2016;Farragher, 2014;Shankar et al, 2006;Sulich et al, 2017). This softening is observed regardless of the test temperature and the level of deformation.…”

Section: Introductionmentioning

confidence: 99%

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Temperature-Dependent Fatigue Characteristics of P91 Steel

Egner

Sulich

Mroziński

et al. 2020

Acta Mechanica Et Automatica

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In this paper, the experimental investigations, constitutive description and numerical modelling of low-cycle fatigue behaviour of P91 steel in non-isothermal conditions are presented. First, experimental tests are performed to recognise different aspects of material behaviour. Then, an appropriate constitutive model is developed within the framework of thermodynamics of irreversible processes with internal state variables. The model describes two phases of cyclic softening, related to plastic mechanisms. An important goal of the presented research is to include thermomechanical coupling in the constitutive modelling. Next, the model parameters are identified based on the available experimental data. Some parametric studies are presented. Finally, numerical simulations are performed, which indicate the significant influence of thermomechanical coupling on the response of the constitutive model in thermomechanical fatigue conditions.

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Section: Materials Behaviourmentioning

confidence: 99%

Section: State Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Temperature-Dependent Fatigue Characteristics of P91 Steel

Egner

Sulich

Mroziński

et al. 2020

Acta Mechanica Et Automatica

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“…Structural elements of many technical devices, such as elements of power plants, bridges, and wind farms, may be subjected to occasional significant static loads during operation, resulting, for example, from improper start-up, assembly, or shutdown due to seismic events. The effects of such unforeseen events (emergencies) in the form of initial deformations are usually disregarded in fatigue calculations, which are most often based on the data determined experimentally using as-received materials [1][2][3][4][5][6]. However, to properly design important technical objects that may be subject to occasional unforeseen events, it is necessary to have detailed knowledge about the construction material response to possible additional deformation, which may affect the course of material stabilization and material data used in fatigue calculations.…”

Section: Introductionmentioning

confidence: 99%

Effect of Testing Conditions on Low-Cycle Fatigue Durability of Pre-Strained S420M Steel Specimens

Mroziński,

Piotrowski,

Egner

2024

Materials

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S420M steel subjected to strain-controlled low-cycle fatigue does not exhibit a period of cyclic properties stabilization. The maximum stress on a cycle continuously drops until fracture. For this reason, it is difficult to plan experimental research for different types of control in such a way that their results can be considered comparable. The aim of this paper is to present and discuss the results of tests conducted in various conditions of low-cycle fatigue of S420M steel specimens, both undeformed and pre-strained. In both loading conditions, after initial deformation, a significant change in the cyclic properties of steel described by the parameters of the hysteresis loop was observed. Also, the fatigue life of the pre-strained specimens appeared to be different from unstrained specimens and was affected by the test loading conditions. The reduction in life under controlled stress conditions was attributed to the increase in the extent of plastic deformation and stress and the occurrence of creep.

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“…The vast majority of the durability assessment described in them is based on the point values of deformations, stresses derived from the complex state of stress and deformation of the structure, determined using the finite element method [ 8 , 9 ]. On the other hand, further procedures in the durability assessment presented in the exemplary publications [ 10 ] or [ 11 ] are analogous to those in standard documents. Another way to approach the assessment of durability is using the so-called criteria functions, such as the parameters of Coffin and Ostergren, which have been described in publications prepared for NASA [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigations of the Influence of Operation on the Technical Condition of Pressure Vessels

2022

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The paper presents the issues related to the design and assessment of the technical condition as well as determination of the residual durability of pressure equipment. Based on a real a example, a liquid nitrogen spherical tank, we present the development and applicability of the method for assessment of the durability of the structure. In terms of the material itself, the authors analyze macroscale (structural) factors of the geometry of the real structure (by 3D scanning: material wear detection, deflections and deformations, etc.) and measured real operational loads to develop an integrated method, including material model and behavior in its operational condition, delivering a useful tool for macroscale structural analyses of the materials under complex load (mechanical, thermal, chemical, etc.). As a result, a detailed analysis of the tank is presented. The paper gives an idea of the method, its development, usefulness, and applicability of the presented approach by indication of the mutual influence of pressure vessel components (e.g., stubs, manholes) and operational loads, which may result in underestimating the strength and durability of the pressure vessels in the design process and during operation.

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Modeling of cyclic thermo-elastic-plastic behaviour of P91 steel

Cited by 7 publications

References 28 publications

Temperature-Dependent Fatigue Characteristics of P91 Steel

Temperature-Dependent Fatigue Characteristics of P91 Steel

Effect of Testing Conditions on Low-Cycle Fatigue Durability of Pre-Strained S420M Steel Specimens

Numerical and Experimental Investigations of the Influence of Operation on the Technical Condition of Pressure Vessels

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