Low-cycle fatigue life prediction of a polycrystalline nickel-base superalloy using crystal plasticity modelling approach

Yuan, Guang Jian; Zhang, Xian Cheng; Chen, Bin; Tu, S.T.; Zhang, Chengcheng

doi:10.1016/j.jmst.2019.05.072

Cited by 69 publications

(19 citation statements)

References 37 publications

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“…The elongation of X12CrMoWVNbN10-1-1 is 23% based on the tensile experiment at 600 °C [ 49 ]. Due to the limitation of calculation efficiency and the assumption of linear accumulation of equivalent plastic strain, the evolution curve of D f for cycle is linearly extended to D f = 1, as shown in Figure 7 b, which is consistent with the tendency in many published literature [ 54 , 55 ]. From the evolution curves of fatigue damage of the hotspots in the specimens with different notch root radii, it can be found that the number, N , of cycles to fatigue crack initiation is reduced as the radius of the root of the notch decreases.…”

Section: Resultssupporting

confidence: 86%

Creep-Fatigue Crack Initiation Simulation of a Modified 12% Cr Steel Based on Grain Boundary Cavitation and Plastic Slip Accumulation

et al. 2021

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High-temperature components in power plants may fail due to creep and fatigue. Creep damage is usually accompanied by the nucleation, growth, and coalescence of grain boundary cavities, while fatigue damage is caused by excessive accumulated plastic deformation due to the local stress concentration. This paper proposes a multiscale numerical framework combining the crystal plastic frame with the meso-damage mechanisms. Not only can it better describe the deformation mechanism dominated by creep from a microscopic viewpoint, but also reflects the local damage of materials caused by irreversible microstructure changes in the process of creep-fatigue deformation to some extent. In this paper, the creep-fatigue crack initiation analysis of a modified 12%Cr steel (X12CrMoWvNBN10-1-1) is carried out for a given notch specimen. It is found that creep cracks usually initiate at the triple grain boundary junctions or at the grain boundaries approximately perpendicular to the loading direction, while fatigue cracks always initiate from the notch surface where stress is concentrated. In addition to this, the crack initiation life can be quantitatively described, which is affected by the average grain size, initial notch size, stress range and holding time.

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Section: Resultssupporting

confidence: 86%

Creep-Fatigue Crack Initiation Simulation of a Modified 12% Cr Steel Based on Grain Boundary Cavitation and Plastic Slip Accumulation

et al. 2021

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“…Further, a comparative analysis was conducted by researchers to assess the accuracy of these microstructure-sensitive FIPs under LCF loading. Some scholars [14] confirm that plastic strain energy (PSE) is a more convincing approach for fatigue life prediction under the condition of high strain, as the PSE dissipation is a criterion that is independent of material parameters and it can reflect the strain path dependence under multiaxial cyclic loading. In addition, Wang et al [15] adopted the PSE to assess fatigue damage evolution of materials at the crack tip of a compact tension (CT) specimen under LCF loading and found that the development of mechanical degradation may depend on the collective effects of grain size and inclusion combination.…”

Section: Introductionmentioning

confidence: 99%

Micromechanics-Based Low Cycle Fatigue Life Prediction Model of ECAPed Aluminum Alloy

Sun

Xie

Pan

et al. 2022

Metals

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Ultrafine-grained aluminum alloys (UFG AA) show great potential in the design of fatigue-resistant lightweight alloys, and the methodology to assess low-cycle fatigue (LCF) life remains to be studied. In this work, a micromechanics-based LCF life prediction model is presented by conducting crystal plasticity finite element simulation (CPFEM). The fatigue indicator parameter (FIP) of maximum accumulated equivalent plastic strain energy, modulated by triaxiality, is developed to assess the material damage in the microstructure. Particularly, a new multiaxial strain parameter is proposed by considering the combined influence of the mean strain and non-proportional cyclic additional hardening effect, and then directly embedding into the cyclic J-integral. Finally, the reformulated Manson-Coffin relationship is theoretically constructed by correlating the crack tip opening displacement to the crack propagation equation. The results show the scatter fatigue life of UFG AA6061 is not only related to the inhomogeneous evolution of plastic deformation but also to the local stress state. Since the proposed approach considers both the deformation mechanisms at the micro-scale and the corresponding macroscopic responses, it can predict the LCF life of UFG AA with reasonable accuracy.

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“…With the development of computational technology, the numerical simulation method has been widely used in the study of the fatigue failure mechanism in recent years. Some scholars propose some fatigue life analysis models which used cumulative plastic slip and energy dissipation calculated by crystal plasticity [ 17 ], plastic work [ 18 , 19 ], equivalent plastic strain [ 20 ] as parameters, etc. For the polycrystalline metals, many researchers suggest the material model of representative volume element (RVE) constructed by using the Voronoi polycrystalline polyhedron aggregation [ 21 , 22 ] and study the mesoscopic behavior of materials under cyclic loading with crystal plasticity.…”

Section: Introductionmentioning

confidence: 99%

Torsional Fatigue Life Prediction of 30CrMnSiNi2A Based on Meso-Inhomogeneous Deformation

Cen

Qin

et al. 2021

Materials

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In this paper, torsional fatigue failure of 30CrMnSiNi2A steel which exhibited non-Masing behavior was studied under different constant shear strain amplitudes, using thin-walled tubular specimens. The relationship between shear fatigue and the evolution of meso-deformation inhomogeneity and the prediction method of the torsional fatigue life curve were investigated. Shear fatigue of the material under constant amplitude was researched by numerical simulation with reference to tests, by using crystal plasticity of polycrystalline representative volume element (RVE) as the material model. Considering the non-Masing behavior of material, when determining the parameter values of the crystal plasticity model the correlation between these parameters and strain amplitude was taken into account. The meso-deformation inhomogeneity with increments in the number of cycles was characterized by using the statistical shear strain standard deviation of RVE as the basic parameter. Considering the effect of strain amplitude on fatigue damage, ratio cycle peak stress/yield stress was taken as the weight to measure the torsional fatigue damage and an improved fatigue indicator parameter (FIP) to measure the inhomogeneous deformation of the material was proposed. The torsional fatigue life curve of 30CrMnSiNi2A steel was predicted by the critical value of the FIP and then the result was confirmed.

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Low-cycle fatigue life prediction of a polycrystalline nickel-base superalloy using crystal plasticity modelling approach

Cited by 69 publications

References 37 publications

Creep-Fatigue Crack Initiation Simulation of a Modified 12% Cr Steel Based on Grain Boundary Cavitation and Plastic Slip Accumulation

Creep-Fatigue Crack Initiation Simulation of a Modified 12% Cr Steel Based on Grain Boundary Cavitation and Plastic Slip Accumulation

Micromechanics-Based Low Cycle Fatigue Life Prediction Model of ECAPed Aluminum Alloy

Torsional Fatigue Life Prediction of 30CrMnSiNi2A Based on Meso-Inhomogeneous Deformation

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