Prediction of Fatigue Strength of Aluminum Casting Alloys by the .RAD.area Parameter Model.

Kobayashi, M; Matsui, Toshiharu

doi:10.1299/kikaia.62.341

Cited by 21 publications

(11 citation statements)

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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: 85%

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: 85%

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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“…So, before the final fatigue fracture, it is important to predict the maximum size of the microstructural factor, at which the crack is preferentially initiated. Murakami et al have proposed the calculation method to predict fatigue strength using the square root area of the maximum casting defect or inclusion [12][13]. The method is based on the extreme value statistic formulated by E. J. Gumbel [14].…”

Section: Fatigue Testsmentioning

confidence: 99%

Effects of solidification structure on fatigue crack initiation and fatigue strength in Al−Si−Mg cast alloys

2002

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Rotating-bending uniaxial fatigue tests and micro-fatigue crack initiation tests were carried out using a permanent mold cast (PMC) and semi-solid die cast (SDC) with Al-7%Si-0.35%Mg composition in order to examine the relationship between solidification structures and fatigue behaviors. The crack length was measured using a replication method. Fatigue strength was improved in SDC, which was almost consistent with the predicted fatigue strength using the size of Si particle cluster. Resistance to fatigue crack initiation and fatigue strength were improved in SDC owing to the finer Si cluster and to higher ultimate tensile strength. Fatigue crack in PMC was preferentially initiated at pores. For SDC, the fatigue crack was initiated at the Si particle/ matrix interface, and then sucessively grew along eutectic cell boundaries.

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“…Most of conventional approaches to fatigue have claimed that the fatigue crack is initiated at the maximum defect and grows up to final failure surface. For example, Murakami's square-root area parameter model (25) can predict the fatigue limit based on the maximum defect area and the Vickers hardness, and has been applied not only to steels but also to cast aluminium alloys (5), (10),(12)~(14), (16) . Most of the crack growth models (2),(4),(6),(7), (17), (19) to predict the fatigue life also start from the crack initiation at the maximum stress-raiser, that is, the maximum defect.…”

Section: Introductionmentioning

confidence: 99%

X-Ray CT Inspection for Porosities and Its Effect on Fatigue of Die Cast Aluminium Alloy

Kuwazuru

Murata

Hangai

et al. 2008

JMMP

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Effect of porosities on the fatigue properties of high-pressure die cast aluminium alloy is addressed. Three-dimensional shape and location of porosities in the specimen were inspected by the X-ray CT to determine which pore affects the fatigue crack. The tension-compression fatigue test was carried out and the CT inspection was also conducted for all the specimens before and after the fatigue test. By comparing the CT inspection with the SEM observation of the fracture surface, we confirmed that the crack initiation was restricted to shrinkage pores near the specimen surface, and the inner large pores were not the source of fatigue crack. But we found that a cluster of shrinkage cavities can initiate a crack and affect the fatigue fracture although it exists far inside. Multiple cracks were also found on the bumpy fracture surface, and they seemed to reduce the fatigue life by coalescing into a single large crack. Moreover, we demonstrated the successive CT inspection during the fatigue test, and showed its availability to detect the fatigue crack propagation behavior.

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Prediction of Fatigue Strength of Aluminum Casting Alloys by the .RAD.area Parameter Model.

Cited by 21 publications

References 0 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

Effects of solidification structure on fatigue crack initiation and fatigue strength in Al−Si−Mg cast alloys

X-Ray CT Inspection for Porosities and Its Effect on Fatigue of Die Cast Aluminium Alloy

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