Crack propagation behavior and mechanism of coarse-grained copper in cyclic torsion with axial static tension

Xu, Jiafang; Li, R.H.; Zhang, P.; Zhang, Z.F.

doi:10.1016/j.ijfatigue.2019.105304

Cited by 7 publications

(6 citation statements)

References 24 publications

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“…The annealed polycrystalline Cu is called coarse-grained copper (CG Cu) in the following. The microstructure and the tensile and torsional properties of CG Cu have been reported in our early work (Xu et al, 2020).…”

Section: Preparation Of Cg Cumentioning

confidence: 83%

“…In order to avoid the influence of complex microstructure in engineering materials and introduced flaws or pre-cracks on cracking behaviors, Xu et al (2020) studied the crack extension of polycrystalline copper with a simple structure under cyclic torsion with and without axial static tension using smooth cylindrical specimens and analyzed their micro-mechanisms. They made a conclusion that axial static tension can lead to the bifurcation of cracks at lower strain amplitude but not for higher strain amplitude.…”

Section: Introductionmentioning

confidence: 99%

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Crack bifurcation behavior of coarse-grained copper under cyclic torsion combined with axial static loading

Yue Liu,

Hua Li,

Chen

2023

Rev. metal.

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Because the growth behaviors of fatigue cracks are crucial for the safe assessment of structural components, the crack propagation behaviors of coarse-grained copper (CG Cu) subjected to cyclic torsion combined with different axial static stresses were studied. The crack bifurcation behavior is related to the strain amplitude applied. When the strain amplitude is lower, both the type and the magnitude of axial stress have no significant effect on the direction in which the primary crack branches, which is mainly determined by the position of the maximum normal plane. However, when the strain amplitude is higher, the bifurcated crack deviates visibly from the maximum normal plane, which can be attributed to the high degree of plastic deformation and microcracks caused by slip bands along longitudinal direction.

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Section: Preparation Of Cg Cumentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Crack bifurcation behavior of coarse-grained copper under cyclic torsion combined with axial static loading

Yue Liu,

Hua Li,

Chen

2023

Rev. metal.

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“…However, the fatigue cracking behaviors above only focus on the axial tension-compression fatigue loading in lath martensite materials, while the fatigue cracking induced by torsional fatigue was seldom investigated. Besides, there are indeed some studies on other type of microstructures under torsional fatigue loading, such as the δ ferrite grains in martensitic stainless steel, [18] coarse-grained copper, [19,20] and cast aluminum. [21] Those investigation showed that a different loading-mode condition might result in a different stress state and consequently a different fatigue crack initiation and growth behavior.…”

Section: Introductionmentioning

confidence: 99%

Crack Initiation Mechanism of AISI 4340 Steel for High‐Cycle Torsional Fatigue Loading

Wang

Zhang

et al. 2023

steel research int.

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The nucleation of microstructural fatigue cracks in AISI 4340 steel is investigated. The pre‐electropolished specimen is employed for the observation of the very early stage of fatigue crack initiation correlated with the microstructure. It is found that there are precipitate‐free zones (PFZs) around the lath and packet boundary, and the strength of PFZ is lower than that of the lath due to the lack of second‐phase strengthening. Therefore, the fatigue crack would first initiate within the PFZ. Besides, the initiated crack plane usually is the maximum shear stress plane. However, the MnS inclusions would cause stress concentration so that the lath boundary (LB) deviating from the maximum shear stress plane could also have sufficient driving force to crack. In contrast, when the LB is vertical to the cracked MnS inclusion, it would prevent the crack from propagating into the matrix because of the anisotropy of lath martensite. The effects of the stress concentration caused by the MnS inclusion on the maximum deviation angle and the S‐N curve are discussed.

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“…Furthermore, some materials exhibit non-Masing behavior under torsional cyclic loading [ 5 ]. The investigations reported in references [ 2 , 6 , 7 , 8 ] found that the hysteresis loop of the material under axial load and shear load is different, and the mechanism of crack initiation and propagation is also different. For pure torsional fatigue, fatigue cracks usually initiate on the surface or near the surface of the specimen, propagating parallel or perpendicular to the torsion axis of the specimen [ 3 , 6 , 7 , 8 , 9 , 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

“…The investigations reported in references [ 2 , 6 , 7 , 8 ] found that the hysteresis loop of the material under axial load and shear load is different, and the mechanism of crack initiation and propagation is also different. For pure torsional fatigue, fatigue cracks usually initiate on the surface or near the surface of the specimen, propagating parallel or perpendicular to the torsion axis of the specimen [ 3 , 6 , 7 , 8 , 9 , 10 , 11 ]. For solid specimens, some researchers observe that the torsional fatigue global fracture surface present concentric ring-like features, its center is the final rupture region and, moreover, the fatigue crack source is distributed on the specimen’s surface [ 12 , 13 ].…”

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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Crack propagation behavior and mechanism of coarse-grained copper in cyclic torsion with axial static tension

Cited by 7 publications

References 24 publications

Crack bifurcation behavior of coarse-grained copper under cyclic torsion combined with axial static loading

Crack bifurcation behavior of coarse-grained copper under cyclic torsion combined with axial static loading

Crack Initiation Mechanism of AISI 4340 Steel for High‐Cycle Torsional Fatigue Loading

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

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