Creep damage assessment for notched bar specimens of a low alloy steel considering stress multiaxiality

Isobe, Nobuhiro; Yashirodai, Kenji; Murata, Kenichi

doi:10.1016/j.engfracmech.2014.01.017

Cited by 21 publications

(6 citation statements)

References 10 publications

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“…Effect of stress triaxiality on the multiaxiality ductility factor (MDF) for different physical based models. The plot of MDFs and experimental results on notched bar specimens at high temperature are plotted against the stress triaxiality. [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Strain‐based Methods For Creep Damage Modellingmentioning

confidence: 99%

“…The main objective was to optimize and validate the effectiveness of methods for crack initiation and early crack growth in components subjected to both cyclic primary and secondary loads. A significant effort has been done to assess both creep–fatigue crack initiation and crack growth in rotor steel alloys . The current assessment and design codes such as the U.K.'s R5 procedures and the ASME Boiler and Pressure Vessel Code, which are simplified methods, are capable of providing safe, but overly conservative predictions .…”

Section: Introductionmentioning

confidence: 99%

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Advances on creep–fatigue damage assessment in notched components

Barbera

Chen

Liu

2017

Fatigue Fract Eng Mat Struct

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In this paper, the extended Direct Steady Cyclic Analysis method (eDSCA) within the Linear Matching Method Framework (LMMF) is combined with the Stress Modified Ductility Exhaustion method and the modified Cavity Growth Factor (CGF) for the first time. This new procedure is used to systematically investigate the effect of several load parameters including load level, load type and creep dwell duration on the creep–fatigue crack initiation process in a notched specimen. The results obtained are verified through a direct comparison with experimental results available in the literature demonstrating great accuracy in predicting the crack initiation life and the driving mechanisms. Furthermore, this extensive numerical study highlighted the possible detrimental effect of the creep–ratchetting mechanism on the crack growth process. This work has a significant impact on structural integrity assessments of complex industrial components and for the better understanding of creep–fatigue lab scale tests.

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Section: Strain‐based Methods For Creep Damage Modellingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Advances on creep–fatigue damage assessment in notched components

Barbera

Chen

Liu

2017

Fatigue Fract Eng Mat Struct

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“…Due to the effect of stress concentration around the notched area in static loading, the actual stress in the part is less than the one obtained from the equation. There are many ways for investigation of notch effect on material properties like stress triaxiality in these literatures, 27,28 but another acceptable way for calculation of this effect on mechanical behavior of materials is the coefficient of stress concentration relations that are used in some literatures. 29,30 So, the coefficient of stress concentration is used in this manuscript to modify the calculated stress values from equation (3) in order to achieve values close to the experimental ones.…”

Section: Extraction Of Life-stress Curvesmentioning

confidence: 99%

Bending strength and notched-sample fatigue life of hBN/TiC-reinforced steel 316 L: A numerical and experimental analysis

Sadooghi

Payganeh

Tajdari³

et al. 2019

Journal of Composite Materials

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Mechanical failure under cyclic and dynamic loading has always been a concern in engineering applications. Many different properties can be achieved by adding different materials to the metal matrix nanocomposites. In this study, steel 316 L is selected as the matrix, and the additive materials of titanium carbide and hexagonal boron nitride in 3.5 wt% for each one are added as the reinforcement particles. The samples are fabricated by powder metallurgy, compacted in pressure of 410 MPa, and sintered in temperature of 1375℃ for 4 h. In addition, some pure steel 316 L samples were provided for comparison purposes. Numerical simulation of bending strength and fatigue life of the notched samples were conducted and verified with experimental tests on the mechanical parts. It appeared that the nanocomposite specimens present a higher mechanical reliability relative to the pure 316 L as a result of adding nanoparticles. Steel 316 L S–N curves of the notched samples are also obtained from numerical analysis.

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“…Notch effects of the components under creep conditions have been reported in many published works [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20], where the strengthening and weakening effects are both mentioned.…”

Section: Notch Effect and Related Factorsmentioning

confidence: 99%

Notch Effect on Structural Strength of Components at Elevated Temperature Under Creep, Fatigue, and Creep-Fatigue Loading Conditions: Phenomenon and Mechanism

Gong

Cheng

Xuan

et al. 2019

Journal of Pressure Vessel Technology

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Structural discontinuities (e.g., nozzle, hole, and groove) widely occur in many high temperature components of nuclear and fossil power plants. In general, the notched component is used for simplified tests and analyses due to the complexity of the introduction of a practical component. In the previous work, the effects of the notch on failure life of the components have been reported experimentally, including the strengthening and weakening effects; however, the internal mechanisms have not been clearly demonstrated. This work reviews the notch effects on the structural strength of the notched components at elevated temperatures under creep, fatigue, and creep-fatigue loading conditions. Experimental phenomena (i.e., strengthening or weakening effects) for typical notched specimens subjected to the above three loading conditions are summarized, and the related factors for notch effects on creep rupture life or cycle to failure of the components are discussed. The mechanisms for the strengthening or weakening effects induced by a notch are described. Evaluation procedures for notch effect analysis under complex loading conditions are also included, and the primary challenges concerning the notch effect are provided for further investigations.

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Creep damage assessment for notched bar specimens of a low alloy steel considering stress multiaxiality

Cited by 21 publications

References 10 publications

Advances on creep–fatigue damage assessment in notched components

Advances on creep–fatigue damage assessment in notched components

Bending strength and notched-sample fatigue life of hBN/TiC-reinforced steel 316 L: A numerical and experimental analysis

Notch Effect on Structural Strength of Components at Elevated Temperature Under Creep, Fatigue, and Creep-Fatigue Loading Conditions: Phenomenon and Mechanism

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