Ultimate creep load and safety assessment of P91 steel pipe with local wall thinning at high temperature

Xue, Jiangtao; Zhou, Changyu; Peng, Jian

doi:10.1016/j.ijmecsci.2015.01.010

Cited by 10 publications

(7 citation statements)

References 27 publications

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“…The material used in this paper was P91 steel. Its average chemical composition is shown in Table 1, and the true stress-true strain curve is shown in Figure 1 [21]. Young's modulus E and Poisson's ratio λ were 121 GPa and 0.3, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…α is a material constant. Figure 5a shows the variation in the normalized creep ductility with normalized stress for the P91 steel at 600 • C. Equation (21) can accurately describe the relationship between the normalized creep ductility and the normalized stress. direction or signs; p is Hill's slope, referring to the steepness of the curve; max is the maximum asymptote of the curve; and min A is the minimum asymptote of the curve.…”

Section: Stress-dependent Multiaxial Creep Ductility Modelmentioning

confidence: 99%

“…The initial crack geometry a 0 /t and a 0 /c 0 were assumed to be 0.2 and 1, in turn. The damages were calculated using the stress-dependent creep constitutive in Equation ( 12) and the stressdependent creep ductility in Equation (21); and the damage distribution around the creep crack tip is shown in Figure 13a-c when t/t r = 1 (t r denotes the failure time).…”

Section: Effect Of the Internal Pressure On The Creep Crack Growth Be...mentioning

confidence: 99%

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A Creep Constitutive Model, Based on Deformation Mechanisms and Its Application to Creep Crack Growth

Zhang

Zan

et al. 2022

Metals

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In this paper, a constitutive model, based on the creep deformation mechanism in P91 steel, under a wide range of stress levels, was established and embedded into finite element software. The accuracy and reliability of the model was verified by comparing the simulation of uniaxial creep tensile test results and the experimental data under different stress levels for P91 steel at 600 °C. The creep crack growth behavior of P91 steel, under a wide range of stress levels was simulated using a ductility-exhaustion-based damage model, combined with the stress-dependent creep ductility model, and the predicted creep crack growth (CCG) rates were compared with the experimental data. Finally, the established model was used to predict the CCG behavior for the pressurized pipes with axial surface cracks. The results show that the constitutive model, established on the basis of the creep deformation mechanism, agrees better with the experimental data than other constitutive models. The CCG rate varies at different direction angles θ for the axial surface cracks. The direction angle θ corresponding to the maximum creep crack length is about 33°, when the internal pressure exceeds 10 MPa. The initial crack shape (a0/c0) = 1, and it does not change with different initial crack depth ratios (a0/t). The established constitutive model can be well used in CCG life analyses and designs of high-temperature structures.

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Section: Methodsmentioning

confidence: 99%

Section: Stress-dependent Multiaxial Creep Ductility Modelmentioning

confidence: 99%

Section: Effect Of the Internal Pressure On The Creep Crack Growth Be...mentioning

confidence: 99%

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A Creep Constitutive Model, Based on Deformation Mechanisms and Its Application to Creep Crack Growth

Zhang

Zan

et al. 2022

Metals

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“…Sinaie et al [21,22] studied the high-temperature mechanical properties of crude structural steel under a repetitive loading, and proposed the corresponding correlation of stress-strain-temperature. Xue et al [23] took advantage of the existing models to develop a finite element simulation for analysing the creep limit of P91 steel pipe with weakened pipe walls, and proposed the relationships and methods for safety assessment of the structures.…”

Section: Introductionmentioning

confidence: 99%

An experimental investigation of properties of Q345 steel pipe at elevated temperatures

Yuan

Shu

Huang

et al. 2016

Journal of Constructional Steel Research

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This paper presents the results of an extensive experimental investigation of the thermal and mechanical properties of Q345 steel pipe at elevated temperatures using both the steady-state and transient-state test methods. Under these two test conditions, the thermal expansion coefficient, yield strength and elastic modulus of the specimens at different temperatures were measured. The tested results indicate that both the yield strength and elastic modulus decrease gradually with increasing temperature. However, at the same temperature, both the yield strength and elastic modulus tested using the steady-state test are higher than those tested using the transient-state test.Hence, it is less safe to use the material properties tested using the steady-state test for fire resistance design of the steel structure. Based on the transient-state test results, the models of the mechanical properties of Q345 steel pipe at elevated temperatures were proposed. These models can be used for the design and analysis of Q345 steel pipe structures under fire conditions. Keywords：Q345 steel pipe; High temperature；Steady-state test；Transient-state test; Mechanical properties；Fire resistant design Highlights: To generate the thermal and mechanical properties of Q345 steel pipe at elevated temperatures using both the steady-state and transient-state test methods. To compare the material properties tested using both the steady-state and the transient-state tests. To propose the models of thermal and mechanical properties of Q345 steel pipe at elevated temperatures.

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“…Как показывает практика эксплуатации трубопроводов атомных и тепловых электростанций, в диапазоне температур 550…650 °с процессы ползучести оказывают существенное влияние на длительную прочность, особенно в случае наличия концентраторов напряжений в области геометрических аномалий (трещин, локальных коррозионно-эрозионных утонений) или конструктивных неоднородностей (мест стыков разнотолщинных элементов, трубопроводной арматуры, прочее) [1,2]. накопление необратимых деформаций ползучести может повлечь зарожде-ние и развитие равномерно распределенной поврежденности материала труб с сопутствующим снижением их несущей способности.…”

unclassified

Methodology Of Numerical Prediction Of Serviceability Of Pipeline Elements With Corrosion-erosion Defects Under Conditions Of High-temperature Operation

Milenin¹,

Velikovanenko²,

Rozynka³

et al. 2017

Tekh. Diagnost. i Nerazrush. Kontrol

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show abstract

Ultimate creep load and safety assessment of P91 steel pipe with local wall thinning at high temperature

Cited by 10 publications

References 27 publications

A Creep Constitutive Model, Based on Deformation Mechanisms and Its Application to Creep Crack Growth

A Creep Constitutive Model, Based on Deformation Mechanisms and Its Application to Creep Crack Growth

An experimental investigation of properties of Q345 steel pipe at elevated temperatures

Methodology Of Numerical Prediction Of Serviceability Of Pipeline Elements With Corrosion-erosion Defects Under Conditions Of High-temperature Operation

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