A Model to Predict the Fractal Dimension of Fractured Surfaces of 7075 Aluminium Alloys Based on Koch's Fractal Curve and Mechanical Properties

Hilders, O.A.; Peña, N.; Roa, Olga

doi:10.4028/www.scientific.net/msf.217-222.1485

Cited by 3 publications

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“…It is seen from Figure 6.3 that the more ductile specimens, corresponding to lower strengths arising from varying heat-treatment conditions, were represented by higher values of fractal dimension. This is in agreement with the results reported in the literature: the rougher the fracture surfaces, the larger the fractal dimension [68,[75][76][77][78][79][80]98]. 24 ~---------------------------------. •…”

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Effect of heat treatment on mechanical properties of bio-medical Ti-6A1-4V eli alloy

Venkatesh¹

2021

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confidence: 91%

“…Similar results on 7075-T651 aluminum alloy were reported by Hilders eta!. [98]. It is seen from Figure 6.3 that the more ductile specimens, corresponding to lower strengths arising from varying heat-treatment conditions, were represented by higher values of fractal dimension.…”

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Effect of heat treatment on mechanical properties of bio-medical Ti-6A1-4V eli alloy

Venkatesh¹

2021

Preprint

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“…2 and 5, it can be found that both yield strength and ultimate tensile strength decrease with increasing fractal dimension. Similar results on 7075-T651 aluminum alloy and Ti6Al4V extra-low interstitial alloy were reported by Hilders et al 25) and Venkatesh et al 18) In a word, the more ductile specimens, corresponding to lower strengths arising from different temperature conditions, were represented by higher values of fractal dimension. Figure 6 shows TEM images of the tensile deformation microstructures of CP titanium.…”

Section: Characterizations Of Surface Deformation Damage and Fracturesupporting

confidence: 75%

Characterizations of Temperature-Dependent Tensile Deformation and Fracture Features of Commercially Pure Titanium

et al. 2013

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Tensile deformation and fracture behavior of a commercially pure (CP) titanium were investigated at different temperatures through mechanical tests, microstructural observations and fractal analyses. It was found that, with increasing temperature, the number and size of microvoids formed along shear bands (SBs) or at the intersections of SBs on the deformed specimen surface increase, and the fractal dimensions of the scanning profile at the surface near fracture increase correspondingly, and the ones measured perpendicular to the tensile direction is obviously larger than those parallel to the tensile direction, indicating an increased concentration of plastic deformation of CP Ti along the tensile axis. The diameter and depth of dimples on the fracture surfaces of CP Ti increase significantly with increasing temperature, giving rise to a higher fracture surface roughness reflected by a higher fractal dimension. TEM observations demonstrated that the plastic deformation of CP Ti is gradually occupied by dislocation slipping rather than twinning with increasing temperature. This is in good agreement with the fractal analyses of the deformation and fracture features.

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Fractal Characterization of the Fractured Surface of a Duplex Stainless Steel and Their Relation with the Strength and Ductility

Hilders

Sáenz²,

Peña

et al. 2000

Microsc Microanal

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Due to the very good combination of the most outstanding properties of ferrite and austenite, the microstructure of duplex stainless steels allows them to obtain high strength and toughness levels even at low temperatures . As a result of these combined effects, duplex stainless steels have become very popular for many applications . In practice, the prolonged use of these materials at temperatures below approximately 500°C may cause an embrittlement of the ferrite phase, which has been called 475°C embrittlement. Thus, the isothermal aging at 475°C can be exploited to produce a variety of strength values associated with the corresponding decreases in ductility and variations of the fractal dimension of the fracture surfaces. No experimental measurements of the fractal dimension - tensile properties relationships are available for many commercial metallic alloys, then, the present experiments on a duplex stainless steel were conducted to show that the fractal dimension, D, many be used as a characterization parameter in fracture morphology - mechanical properties studies.

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A Model to Predict the Fractal Dimension of Fractured Surfaces of 7075 Aluminium Alloys Based on Koch's Fractal Curve and Mechanical Properties

Cited by 3 publications

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Effect of heat treatment on mechanical properties of bio-medical Ti-6A1-4V eli alloy

Effect of heat treatment on mechanical properties of bio-medical Ti-6A1-4V eli alloy

Characterizations of Temperature-Dependent Tensile Deformation and Fracture Features of Commercially Pure Titanium

Fractal Characterization of the Fractured Surface of a Duplex Stainless Steel and Their Relation with the Strength and Ductility

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