Fractal analysis of the bending-torsion fatigue fracture of aluminium alloy

Macek, Wojciech

doi:10.1016/j.engfailanal.2019.02.007

Cited by 40 publications

(10 citation statements)

References 28 publications

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“…al., 2019) give complete information because a single line cannot identify pits or valleys and show the relationship between surface function, as confirmed by Stach et al (Stach et al, 2017). The combination of fatigue testing with the surface metrology by the authors of this work (Macek, 2019a(Macek, , 2019b gave promising results in previous studies. Therefore, it was decided to develop this methodology, based on the entire fracture surface, for testing other materials subjected to bending with torsion.…”

Section: Introductionmentioning

confidence: 52%

Effect of non-zero mean stress bending-torsion fatigue on fracture surface parameters of 34CrNiMo6 steel notched bars

Macek

Szala

Trembacz

et al. 2020

Production Engineering Archives

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Modern methods of testing materials require the use of the latest technologies and combining measurement and calculation methods. It is important to find a quantitative way of describing, among other things, the failures so that it can help to design with high accuracy. This paper studies loading orientations on crack shape and fracture surface changes. The advantage of the entire fracture surface method is simplicity and applicability in studies on other materials, shapes and loadings. A higher values of fracture surface parameters (Sx, Vx) was observed in failure specimens with lower σ/τ (B/T) ratios. It has been observed that largest crack lengths with a small number of cycles occur for loading combinations different then B=T. As well as analyzed surface parameters Sx, Vx, are higher for larger number of cycles to crack initiation (Ni) values.

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Section: Introductionmentioning

confidence: 52%

Effect of non-zero mean stress bending-torsion fatigue on fracture surface parameters of 34CrNiMo6 steel notched bars

Macek

Szala

Trembacz

et al. 2020

Production Engineering Archives

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“…This paper focus on the promising results obtained by fractographical analysis, partially presented previously by the Author. One of the most important outcomes is the introduction of field parameters S-and V-in the context of the description of fatigue fracture surfaces of 6082 aluminum alloy [24], fractal dimension for bending-torsion fatigue fracture surfaces [25,26], strain sequence consequences on fracture surface topographies in 7075-T651 aluminum alloy specimens [27], or also to compare profile and areal surface parameters for fracture specifications [28]. R-profile and areal S-parameters were also taken into account in another cited work by the Author [29], to explain the effect of various fatigue variables during fracture surface formation of notched 2017A-T4 aluminum alloy under bending fatigue.…”

Section: Introductionmentioning

confidence: 99%

Fracture Areas Quantitative Investigating of Bending-Torsion Fatigued Low-Alloy High-Strength Steel

Macek¹

2021

Metals

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In this study, the impact of pseudo-random non-proportional bending-torsion fatigue loadings proportion on the fatigue life and the fracture surface topography was analyzed. Investigation was carried out for 24 specimens made of S355J2 steel with 11 different ratios of maximum stresses λ. For these cases, after the fatigue tests, the surface topography measurements were carried out using an optical profilometer, using the focus variation method. Three fracture zones were analyzed for each specimen: (1) total; (2) propagation; (3) rupture, taking into account the root average square height Sq and void volume Vv parameters. The results pointed that ratio of maximum stresses λ is the most influenced on volume surface parameters represented by void volume at a given height Vv, in the rupture area. A new fatigue loading parameter P was used, depending on fatigue life T and ratio of maximum stresses λ, which shows very good correlation in 4th degree type of fit, to void volume Vv parameter for the rupture area.

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“…Therefore, the present study aimed to investigate bending–torsion fatigue fractures in order to establish the dependence between the loading scenario and the characteristic features of their surfaces. The literature describes the influence of loading conditions on the topography of fracture surfaces via either local terms (i.e., crack propagation and rupture) [ 34 , 35 , 36 , 37 , 38 ] or based on analysis of the total fracture area [ 39 , 40 ]. In this work, the results of both approaches (local and total fracture zones) for specimens with different geometries were compared for three materials.…”

Section: Introductionmentioning

confidence: 99%

Profile and Areal Surface Parameters for Fatigue Fracture Characterisation

et al. 2020

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Post-mortem characterisation is a pivotal tool to trace back to the origin of structural failures in modern engineering analyses. This work compared both the crack propagation and rupture roughness profiles based on areal parameters for total fracture area. Notched and smooth samples made of weather-resistant structural steel (10HNAP), popular S355J2 structural steel and aluminium alloy AW-2017A under bending, torsion and combined bending–torsion were investigated. After the fatigue tests, fatigue fractures were measured with an optical profilometer, and the relevant surface parameters were critically compared. The results showed a great impact of the loading scenario on both the local profiles and total fracture areas. Both approaches (local and total fracture zones) for specimens with different geometries were investigated. For all specimens, measured texture parameters decreased in the following order: total area, rupture area and propagation area.

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Fractal analysis of the bending-torsion fatigue fracture of aluminium alloy

Cited by 40 publications

References 28 publications

Effect of non-zero mean stress bending-torsion fatigue on fracture surface parameters of 34CrNiMo6 steel notched bars

Effect of non-zero mean stress bending-torsion fatigue on fracture surface parameters of 34CrNiMo6 steel notched bars

Fracture Areas Quantitative Investigating of Bending-Torsion Fatigued Low-Alloy High-Strength Steel

Profile and Areal Surface Parameters for Fatigue Fracture Characterisation

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