Fatigue life assessment of notched round bars under multiaxial loading based on the total strain energy density approach

Branco, R.; Costa, J.D.; Berto, Filippo; Antunes, F.V.

doi:10.1016/j.tafmec.2017.06.003

Cited by 44 publications

(28 citation statements)

References 32 publications

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“…This formulation, unlike the former, can be used either in low-or high-cycle fatigue regime, and is sensitive to the mean stress. In a recent study, the fatigue crack initiation life in round bars with U-notches subjected to combined bending-torsion loading was predicted using this approach [25]. The plastic strain energy density, as a fatigue damage parameter, is most appropriate under high strain levels, since it is difficult to measure close to the fatigue limit, resulting in higher errors and improper fatigue life assessments.…”

Section: Energy-life Relationshipmentioning

confidence: 99%

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Low-Cycle Fatigue Behaviour of AISI 18Ni300 Maraging Steel Produced by Selective Laser Melting

Branco

Costa

Berto

et al. 2018

Metals

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Selective laser melting has received a great deal of attention in recent years. Nevertheless, research has been mainly focused on the technical issues and their relationship with the final microstructure and monotonic properties. Fatigue behaviour has rarely been addressed, and the emphasis has been placed on high-cycle regimes. The aim of this paper is, therefore, to study, in a systematic manner, the cyclic plastic behaviour of AISI 18Ni300 maraging steel manufactured by selective laser melting. For this purpose, low-cycle fatigue tests, under fully-reversed strain-controlled conditions, with strain amplitudes ranging from 0.3% to 1.0%, were performed. After testing, fracture surfaces were examined by scanning electron microscopy to identify the main fatigue damage mechanisms. The analysis of results showed a non-Masing material, with a slight strain-softening behaviour, and non-linear response in both the elastic and plastic regimes. In addition, this steel exhibited a very low transition life of about 35 reversals, far below the values of conventional materials with equivalent monotonic mechanical properties, which can be attributed to the combination of high strength and low ductility. The total strain energy density, irrespective of strain amplitude, revealed itself to be a quite stable parameter throughout the lifetime. Finally, the SEM analysis showed for almost all the tested samples cracks initiated from the surface and inner defects which propagated through the rest of the cross section. A ductile/brittle fracture, with a predominance of brittle fracture, was observed in the samples, owing to the presence of defects which make it easier to spread the microcracks.

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Section: Energy-life Relationshipmentioning

confidence: 99%

Section: Energy-life Relationshipmentioning

confidence: 99%

Low-Cycle Fatigue Behaviour of AISI 18Ni300 Maraging Steel Produced by Selective Laser Melting

Branco

Costa

Berto

et al. 2018

Metals

Self Cite

View full text Add to dashboard Cite

show abstract

“…Analytical methods for multiaxial fatigue analysis are divided into a few groups according to the parameters used to describe the fatigue life or fatigue strength of materials. These are stress criteria, strain criteria, energy criteria, and critical plane concept . The experience has shown that theoretical methods are not adequate in many cases.…”

Section: Resultsmentioning

confidence: 99%

“…These are stress criteria, strain criteria, energy criteria, and critical plane concept. [21][22][23][24][25][26] The experience has shown that theoretical methods are not adequate in many cases. That is why the experimental tools are demanded.…”

Section: Resultsmentioning

confidence: 99%

Extrusion/intrusion structure as a fatigue indicator for uniaxial and multiaxial loading

Pejkowski

Karuskevich

Maslak

2019

Fatigue Fract Eng Mat Struct

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The paper describes the experiments aimed at the extension of the method early proposed for the uniaxial fatigue monitoring to the multiaxial modes of loading. The common denominator for both methods approach is based on the possibility of computer‐aided optical analysis of extrusion/intrusion structure, called often surface deformation relief, to be used for quantitative assessment of accumulated fatigue damage and remaining life. Experimental data obtained under the different modes of loading are presented and described as well as some objectives for the future activities are outlined.

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“…This method has limitation because the behaviour of crack initiation is material dependent. Recently, some new material-dependent approaches [38][39][40] were proposed for defining the criterion of crack initiation. These concepts considered the length of crack initiation as a material parameter related to the critical distance based on the theory of critical distance.…”

Section: Numerical Computation Methodologymentioning

confidence: 99%

Numerical analysis of low cycle fatigue for welded joints considering welding residual stress and plastic damage under combined bending and local compressive loads

Wang

Meng

2020

Fatigue Fract Eng Mat Struct

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The numerical analysis of low cycle fatigue of HTS‐A steel welded joints under combined bending and local compressive loads are implemented using the damage mechanics approach. First, a finite element numerical simulation of the welding process is employed to extract the welding residual stresses, which are then imported as initial stresses in the subsequent fatigue analysis. Second, a multiaxial fatigue damage model including damage coupled elasto‐plastic constitutive equations and plastic damage evolution formulation is applied to evaluate the mechanical degradation of the material under biaxial fatigue loads. Further, the fatigue lives of the HTS‐A steel welded joints are computed and compared with the experimental results from literature. A series of predicted load‐life curves clearly illustrates the variation of fatigue lives along with the combined loadings. Finally, the effects of local compression on accumulated plastic strain and fatigue damage are studied in detail. It is revealed that the local compression induces a damage competition between two critical zones.

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Fatigue life assessment of notched round bars under multiaxial loading based on the total strain energy density approach

Cited by 44 publications

References 32 publications

Low-Cycle Fatigue Behaviour of AISI 18Ni300 Maraging Steel Produced by Selective Laser Melting

Low-Cycle Fatigue Behaviour of AISI 18Ni300 Maraging Steel Produced by Selective Laser Melting

Extrusion/intrusion structure as a fatigue indicator for uniaxial and multiaxial loading

Numerical analysis of low cycle fatigue for welded joints considering welding residual stress and plastic damage under combined bending and local compressive loads

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