A modified Coffin-Manson model for ultra-low cycle fatigue fracture of structural steels considering the effect of stress triaxiality

Li, Shuailing; Xie, Xu; Cheng, Cheng; Qiu, Tian

doi:10.1016/j.engfracmech.2020.107223

Cited by 32 publications

(20 citation statements)

References 17 publications

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“…Currently, the Coffin–Manson equation is the most widely used fatigue life prediction method. It describes the relationship between fatigue life and plastic strain [ 24 ] and can be expressed as follows:

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Section: Methodsmentioning

confidence: 99%

Fatigue Reliability Analysis Method of Reactor Structure Considering Cumulative Effect of Irradiation

et al. 2021

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The influence of irradiation should be considered in fatigue reliability analyses of reactor structures under irradiation conditions. In this study, the effects of irradiation hardening and irradiation embrittlement on fatigue performance parameters were quantified and a fatigue life prediction model was developed. Based on this model, which takes into account the cumulative effect of a neutron dose, the total fatigue damage was calculated according to Miner’s linear cumulative damage law, and the reliability analysis was carried out using the Monte Carlo simulation method. The case results show that the fatigue life acquired by taking into account the cumulative effect of irradiation was reduced by 24.3% compared with that acquired without considering the irradiation effect. Irradiation led to the increase of the fatigue life at low strains and its decrease at high strains, which is in accordance with the findings of an irradiation fatigue test. The rate of increase in the fatigue life decreased gradually with the increase of the neutron dose. The irradiation performance parameters had a small influence on fatigue reliability, while the fatigue strength coefficient and the elastic modulus had a great influence on the fatigue reliability. Compared with the current method, which uses a high safety factor to determine design parameters, a fatigue reliability analysis method taking into account the cumulative effect of irradiation could be more accurate in the reliability analysis and life prediction of reactor structures.

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…”

Section: Methodsmentioning

confidence: 99%

Fatigue Reliability Analysis Method of Reactor Structure Considering Cumulative Effect of Irradiation

et al. 2021

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“…In order to verify the performance of the proposed model in predicting the ULCF of steel bridge piers, we selected constant-amplitude cyclic large strain loading test results of circular notched specimens with varieties of notch radii whose stress state is similar to that of the corner point of a steel bridge pier for comparison from [ 23 , 45 ] and briefly state the related information. The structure and size of the circular notched specimens are shown in Figure 2 .…”

Section: Cyclic Loading Tests Of Circular Notched Specimensmentioning

confidence: 99%

“…It can be seen that the good fit of the force-displacement curves before the curvature mutation point of SP-142 and SP-76 selected from [ 23 ] means the established FEM model and simulation of the cyclic plasticity hardening for Q345qC is satisfactory, as shown in Figure 4 , in which force is the reactive force in the fixed end and displacement denotes the relative displacement between both ends of the gauge length part. Only the compressive part and the Bauschinger effect simulation are slightly offset.…”

Section: Calibration Work Of Model Parametersmentioning

confidence: 99%

“…In order to examine the discretion performance of the three parameters, A , B , and C , in the proposed model, we divide the specimens selected from [ 23 , 45 ] into eight groups, which include as many different notch radii or loading procedures as possible to make the work more convincing; the detailed grouping information is not displayed here. The calibration results are shown in Table 2 .…”

Section: Calibration Work Of Model Parametersmentioning

confidence: 99%

“…XUE introduced an exponential function to make the Coffin–Masson formula suitable for the LCF and ULCF regimes together [ 21 ], and Pereira et al replaced uniaxial equivalent plastic strain with multiaxial strain to consider the effect of the multiaxial stress state [ 17 , 22 ]. Besides, the stress triaxiality related function was introduced into the Coffin–Masson formula by Li et al [ 23 ]. To some extent, these modifications partly promoted the formula’s capability in predicting ULCF.…”

Section: Introductionmentioning

confidence: 99%

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A Simplified Ductile Fracture Model for Predicting Ultra-Low Cycle Fatigue of Structural Steels

Xie

2022

Materials

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Under strong earthquakes, steel structures are prone to undergoing ultra-low cycle fatigue (ULCF) fracture after sustaining cyclic large-strain loading, leading to severe earthquake-induced damage. Thus, establishing a prediction method for ULCF plays a significant role in the seismic design of steel structures. However, a simple and feasible model for predicting the ULCF life of steel structures has not been recognized yet. Among existing models, the ductile fracture model based on ductility capacity consumption has the advantage of strong adaptability, while the loading history effect in the damage process can also be considered. Nevertheless, such models have too many parameters and are inconvenient for calibration and application. To this end, focusing on the prediction methods for ULCF damage in steel structures, with the fragile parts being in moderate and high stress triaxiality, this paper proposes a simplified uncoupled prediction model that considers the effect of stress triaxiality on damage and introduces a new historical-effect related variable function reducing the calibration work of model parameters. Finally, cyclic loading test results of circular notched specimens verify that the proposed model has the advantages of a small dispersion of parameters for calibration, being handy for application, and possessing reliable results, providing a prediction method for ULCF damage of structural steels.

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Influence of loading frequency on ULCF life of structural steel under variable surface roughness

Saleem,

Tamura,

Katsuchi

2023

ce papers

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This paper investigates the effects of a wide range of loading frequencies ranging from 0.005 to 5 Hz and blasting induced surface roughness ranging from 20 to 100 μm on the ultra‐low cycle fatigue (ULCF) life of structural steel. The combined effect of these parameters on ULCF life has not been investigated so far. To this aim, comprehensive ULCF tests were performed on steel specimens under a constant displacement‐controlled environment until the failure occurred. The experimental results manifest that the surface roughness and loading frequency are the governing parameters affecting the ULCF life. The test material exhibits cyclic softening behavior under all loading conditions. An increase in loading frequency from 0.005 to 5 Hz causes a significant increase of 33% and 27% in ULCF life for 20 and 100 μm rough specimens, respectively. However, the effect of frequency on ULCF life becomes less significant at higher values of surface roughness. Moreover, an increase in surface roughness from 20 to 100 μm causes a significant reduction of about 45% and 47% in ULCF life at the loading frequencies of 0.005 and 5Hz, respectively. Furthermore, a correlation between fatigue life and loading frequency as a function of surface roughness is derived by the power law relationship.

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A modified Coffin-Manson model for ultra-low cycle fatigue fracture of structural steels considering the effect of stress triaxiality

Cited by 32 publications

References 17 publications

Fatigue Reliability Analysis Method of Reactor Structure Considering Cumulative Effect of Irradiation

Fatigue Reliability Analysis Method of Reactor Structure Considering Cumulative Effect of Irradiation

A Simplified Ductile Fracture Model for Predicting Ultra-Low Cycle Fatigue of Structural Steels

Influence of loading frequency on ULCF life of structural steel under variable surface roughness

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