Cyclic stress-strain response of polycrystalline copper in a wide range of plastic strain amplitudes

Polák, Jaroslav; Obrtlík, Karel; Hájek, Michal; Vašek, A.

doi:10.1016/0921-5093(92)90177-3

Cited by 58 publications

(17 citation statements)

References 23 publications

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“…While the cause of fatigue failure of macroscopic metallic glasses seems complex, with cracks or a mixture of crack and shear banding involved 36,37 , we show here that shear banding is the major failure mechanism for nano-scale metallic glass samples in low cycle fatigue tests. Such shear banding behavior is somewhat similar 8 to the persistent slip bands, which is the major form of damage for crystalline materials under fatigue tests [38][39][40][41] . In low cycle fatigue for nano-scale metallic glasses, as we show here, the majority of the fatigue life is spent in the shear band initiation.…”

Section: Total-strain-controlled Fatigue Testsmentioning

confidence: 83%

Low-cycle fatigue of metallic glass nanowires

et al. 2015

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Low cycle fatigue fracture of metallic glass nanowires was investigated using molecular dynamics simulations. The nanowires exhibit work hardening or softening, depending on the applied load. The structural origin of the hardening/softening response is identified as the decrease/increase of the tetrahedral clusters, as a result of the non-hardsphere nature of the glass model. The fatigue fracture is caused by shear banding initiated from the surface. The plastic-strain-controlled fatigue tests show that the fatigue life follows the Coffin-Manson relation. Such power-law form originates from plastic-strain-dependent microscopic damage accumulation. Lastly, the effect of notch on low cycle fatigue of nanowires in terms of failure mode and fatigue life was also discussed.

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Section: Total-strain-controlled Fatigue Testsmentioning

confidence: 83%

Low-cycle fatigue of metallic glass nanowires

et al. 2015

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“…Polak et al studied PSBs in copper polycrystals subjected to high-cycle fatigue (Polak et al 2000). Using TEM observations of bulk foils, they observed no PSB for a (maximal) tension-compression stress of 68 MPa.…”

Section: Cyclic Microplasticitymentioning

confidence: 96%

“…Even if the macroscopic (visco)plastic strain is very small, experimental observations showed that (visco)plastic glide takes place in some grains, particularly in well-oriented grains (Polak et al 2000;Mughrabi and Wang 1988). Recent numerical studies gave evaluations of the scatter parameters induced by crystalline viscoplasticity anisotropy (Bennett and McDowell 2003;Lebensohn et al 2004).…”

Section: Short Fatigue Crack Nucleation and Early Propagationmentioning

confidence: 97%

Polycrystalline microstructure, cubic elasticity, and nucleation of high-cycle fatigue cracks

Sauzay

Jourdan

2006

Int J Fract

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It is well-known that high-cycle fatigue cracks usually nucleate in surface well-oriented grains with a high Schmid factor. A numerical evaluation of the effect of crystalline elasticity anisotropy (which is often neglected) on the stress state in well-oriented grains is presented. Each of these grains is located at the free surface of an aggregate. The other crystallographic orientations are random. Numerous finite element computations are carried out for evaluating the effect of the neighboring grain orientations. Resolved shear stress and normal stress averages are given, as well as scatter parameters and histograms. Several metals, orientations, and loading conditions are considered. For common (anisotropic) metals/alloys such as copper and austenitic steels, the local average resolved shear stress is about 18% smaller than the macroscopic value which induces a Schmid factor value with respect to the macroscopic tensile stress of 0.41 instead of the classical 0.5 value. Relative scatters in resolved shear stress and corresponding normal stress are high (respectively ±22% and ±38%). These high scatter values computed for small applied loads can explain many observations taken from the literature showing a large scatter in the plastic slip line feature, dislocation microstructure, microstructurally short M. Sauzay (B) · T. Jourdan DEN-DMN-SRMA, CEA, bât. 455, crack nucleation, and propagation rate among welloriented surface grains. Finally, the effects of some geometrical parameters are evaluated (2D/3D effects, subsurface grains….).

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“…As-produced dislocation structures in metals evolve to yield cyclic-efficient structures that reduce the energy consumed per cycle. In HCF, this is observed in the reduction of the energy consumed per cycle (known as loop shape factor V H ) with decreasing applied strain [10]; the evolution of the loop shape factor correlates with the formation of persistent slip bands in wavy slip metals. For higher applied strains (typically LCF), there is almost no change of V H .…”

Section: Interpretation Of Damage Mechanisms In the Hcf And Vhcf Regimesmentioning

confidence: 98%

Computational micromechanics of fatigue of microstructures in the HCF–VHCF regimes

Musinski

2016

International Journal of Fatigue

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a b s t r a c tAdvances in higher resolution experimental techniques have shown that metallic materials can develop fatigue cracks under cyclic loading levels significantly below the yield stress. Indeed, the traditional notion of a fatigue limit can be recast in terms of limits associated with nucleation and arrest of fatigue cracks at the microstructural scale. Although fatigue damage characteristically emerges from irreversible dislocation processes at sub-grain scales, the specific microstructure attributes, environment, and loading conditions can strongly affect the apparent failure mode and surface to subsurface transitions. In this paper we discuss multiple mechanisms that occur during fatigue loading in the high cycle fatigue (HCF) to very high cycle fatigue (VHCF) regimes. We compare these regimes, focusing on strategies to bridge experimental and modeling approaches exercised at multiple length scales and discussing particular challenges to modeling and simulation regarding microstructure-sensitive fatigue driving forces and thresholds. We conclude by discussing some of the challenges in predicting the transition of failure mechanisms at different stress and strain amplitudes.

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Cyclic stress-strain response of polycrystalline copper in a wide range of plastic strain amplitudes

Cited by 58 publications

References 23 publications

Low-cycle fatigue of metallic glass nanowires

Low-cycle fatigue of metallic glass nanowires

Polycrystalline microstructure, cubic elasticity, and nucleation of high-cycle fatigue cracks

Computational micromechanics of fatigue of microstructures in the HCF–VHCF regimes

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