QUANTITATIVE EVALUATION OF EFFECTS OF IMHOMOGENEITY PHASES ON THE FATIGUE STRENGTH OF Al-Si NEW ALLOYS

Murakami, Yukitaka; Ikeda, Hayato; Toriyama, Toshiyuki

doi:10.1016/b978-0-08-037890-9.50187-3

Cited by 4 publications

(1 citation statement)

References 3 publications

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“…A few techniques exist to investigate [9] the influence of cracks on the fatigue life from Peterson [10], Neuber [11], Heywood [12], Siebel and Stiller [13] by relative stress gradient (RSG). More recently, Kobayashi and Matsui [14,15] confirmed the usability of Murakami's parameter to aluminum alloys as well. The criterion based on local stresses is more realistic [16].…”

Section: Introductionmentioning

confidence: 86%

The investigation of artificial and natural defects on the fatigue strength of vacuum-assisted high pressure die cast AlSi9Cu3(Fe) aluminum alloy

Szalva¹,

Orbulov²

2021

Preprint

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AlSi9Cu3(Fe) vacuum-assisted high pressure die cast (VPDC) specimens were investigated by experimental fatigue test and fracture mechanics approach. The aims of the investigations were (i) to evaluate the fracture resistance and (ii) to indirectly determine the threshold stress intensity value (ΔKth) of casting alloy in uniaxial tension. The specimens were sorted into two groups: specimens with different size (0.01-0.40 mm2) natural defects, and specimens an additional artificial blind hole. The fatigue strength region was tested at R=-1 stress ratio to 107 number of cycles to fracture. The fracture mechanics approach was applied to study the behavior of the small cracks by Kitagawa diagram, the defect size was taken into account by the Murakami’s (√area) parameter. The fatigue strength values were 104.7 MPa for smooth specimen, 92.7 MPa for specimen with D0.3 artificial hole, and 87.2 MPa for specimen with D0.6 artificial hole at the prescribed cycles, respectively.

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Section: Introductionmentioning

confidence: 86%

The investigation of artificial and natural defects on the fatigue strength of vacuum-assisted high pressure die cast AlSi9Cu3(Fe) aluminum alloy

Szalva¹,

Orbulov²

2021

Preprint

View full text Add to dashboard Cite

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High and Ultrahigh Cycle Fatigue

Murakami

2003

Comprehensive Structural Integrity

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Comprehensive Experimental Study for Characterization of Long-Life Fatigue Behavior of 7050 Aluminum Alloy

Melemez,

Karaman,

Tufan

2023

Advances in Accelerated Testing and Predictive Methods in Creep, Fatigue, and Environmental Cracking

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Among a few candidates of 7XXX aluminum alloys that demonstrate high static mechanical properties along with high fatigue endurance, the 7050 alloy has been a leading alloy in the aerospace industry due to its resistance to stress corrosion cracking in all directions. One of the primary issues in design against fatigue with structural material is the effect of applied surface treatment. Previous studies of the 7050 alloy have concentrated on the effect of chromic acid anodizing treatment on low-cycle, transition, and high-cycle fatigue regions without giving special attention to the effect on the “estimated” fatigue limit. Understandably, it is not simple to conduct an exhaustive testing campaign at a very high-cycle region with a great number of specimens. The authors of this study have conducted an extensive fatigue test campaign to characterize the long-life fatigue of 7050 material excised from plate and forgings. Their primary intention was to reveal the degree of reduction in fatigue and accordingly to characterize how different micromechanisms play an active role in the altered fatigue behavior of specimens when subjected to anodizing. For the long-life fatigue tests, the staircase method with a runout criterion of 5E + 7 cycles was employed. Specimens were excised from different orientations and from different thicknesses. The results reveal that the effect of chromic acid anodizing on the fatigue behavior of the 7050 alloy varies in different regions of the S-N curve. In low-cycle and high-cycle regimes up to 106 cycles, a slight decrease in fatigue life exists, as described in the literature. The results of the long-life regime, however, show that anodizing has an unusual effect on fatigue. Efforts were made to understand the responsible mechanism through fractography focused on the crack initiation sites, microstructural characterization, and comparative through-thickness residual stress measurements.

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QUANTITATIVE EVALUATION OF EFFECTS OF IMHOMOGENEITY PHASES ON THE FATIGUE STRENGTH OF Al-Si NEW ALLOYS

Cited by 4 publications

References 3 publications

The investigation of artificial and natural defects on the fatigue strength of vacuum-assisted high pressure die cast AlSi9Cu3(Fe) aluminum alloy

The investigation of artificial and natural defects on the fatigue strength of vacuum-assisted high pressure die cast AlSi9Cu3(Fe) aluminum alloy

High and Ultrahigh Cycle Fatigue

Comprehensive Experimental Study for Characterization of Long-Life Fatigue Behavior of 7050 Aluminum Alloy

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