The use of the specific heat loss to analyse the low- and high-cycle fatigue behaviour of plain and notched specimens made of a stainless steel

Meneghetti, Giovanni; Ricotta, Mauro

doi:10.1016/j.engfracmech.2011.06.010

Cited by 81 publications

(92 citation statements)

References 36 publications

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“…Wan et al [42] postulated that it is the energy stored in the formation of dislocation structures, instead of the energy dissipated, that should be used in predictions of FCI. However, the stored energy criterion presented was calculated as a fraction of the dissipated energy, where the ratio of stored to dissipated energy was assumed to reach a stabilised value after the first few cycles of loading; this is supported by experimental evidence that dissipated energy reaches a given fraction of total energy (composed of dissipated and stored energy) after stabilisation of material cyclic behaviour [43,44]. Based on this assumption, values of stored and dissipated energy (both cyclic and critical quantities) are directly proportional, related by a constant, i.e.…”

Section: Hcf Predictionsmentioning

confidence: 99%

Micro-scale testing and micromechanical modelling for high cycle fatigue of CoCr stent material

Sweeney

O’Brien

Dunne

et al. 2015

Journal of the Mechanical Behavior of Biomedical Materials

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This paper presents a framework of experimental testing and crystal plasticity micromechanics for high cycle fatigue (HCF) of micro-scale L605 CoCr stent material.Micro-scale specimens, representative of stent struts, are manufactured via laser micromachining and electro-polishing from biomedical grade CoCr alloy foil. Crystal plasticity models of the micro-specimens are developed using a length scale-dependent, strain-gradient constitutive model and a phenomenological (power-law) constitutive model, calibrated from monotonic and cyclic plasticity test data. Experimental microstructural characterization of the grain morphology and precipitate distributions is used as input for the polycrystalline finite element (FE) morphologies. Two microstructure-sensitive fatigue indicator parameters are applied, using local and non-local (grain-averaged) implementations, for the phenomenological and length scale-dependent models, respectively, to predict fatigue crack initiation (FCI) in the HCF experiments.

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Section: Hcf Predictionsmentioning

confidence: 99%

Micro-scale testing and micromechanical modelling for high cycle fatigue of CoCr stent material

Sweeney

O’Brien

Dunne

et al. 2015

Journal of the Mechanical Behavior of Biomedical Materials

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“…Meneghetti et al [5][6][7][8] developed a theoretical model to derive specific heat loss per cycle from temperature measurements performed. They proved that the specific heat loss is dependent on the applied stress amplitude and load ratio.…”

Section: Introductionmentioning

confidence: 99%

An energy method for rapid evaluation of high-cycle fatigue parameters based on intrinsic dissipation

Guo

Fan³

et al. 2015

International Journal of Fatigue

128

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“…Accordingly, K' and n' were calculated by fitting the experimental data shown in Fig. 2b, obtained by carrying out the strain controlled fatigue tests [24].…”

Section: Materials and Specimen's Geometrymentioning

confidence: 99%

Strain energy-and stress-based approaches revisited in notch fatigue of ductile steels

2018

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Abstract. The constant amplitude, zero-mean stress, axial-fatigue behaviour of plain and bluntly notched AISI 304 L stainless steel specimens is investigated in terms of strain energy density. Concerning plain material, it was found that at the fatigue knee the plastic strain energy density is 1.49 times higher than the elastic strain energy density. In the authors' opinion, the presence of plasticity at the fatigue knee is responsible for the unsuitableness of classical stress -based approaches to synthesise the fatigue behaviour of this material. On the contrary, the elastic-plastic strain energy density was found an efficient parameter to rationalise in a single scatter band fatigue data of plain and bluntly notched specimens. Based on this result, the classic stress-and the point stress-based approaches were revisited taking into account the presence of plasticity at the fatigue knee, by introducing an equivalent fully elastic material having a linear elastic strain energy density at the fatigue knee equal to that of the actual material. Accordingly, a coefficient of plasticity K p was successfully introduced to modify the classical definition of fatigue strength reduction factor, K f .

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The use of the specific heat loss to analyse the low- and high-cycle fatigue behaviour of plain and notched specimens made of a stainless steel

Cited by 81 publications

References 36 publications

Micro-scale testing and micromechanical modelling for high cycle fatigue of CoCr stent material

Micro-scale testing and micromechanical modelling for high cycle fatigue of CoCr stent material

An energy method for rapid evaluation of high-cycle fatigue parameters based on intrinsic dissipation

Strain energy-and stress-based approaches revisited in notch fatigue of ductile steels

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