Application of modified Kitagawa-Takahashi diagram for fatigue strength assessment of cast Al-Si-Cu alloys

Garb, Christian; Leitner, Martin; Stauder, Bernhard; Schnubel, D.; Grün, Florian

doi:10.1016/j.ijfatigue.2018.01.030

Cited by 37 publications

(11 citation statements)

References 45 publications

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“…In position A, three specimens are tested at a load ratio of R = −1, in order to cover a statistical variation of the test results. The fracture mechanical properties of specimen position B are taken from preliminary studies, which also include an enhanced number of specimens [70].…”

Section: Resultsmentioning

confidence: 99%

“…In order to validate this lifetime model, the fatigue data from the tested specimens is utilised. Furthermore, the long crack threshold as well as the evaluated parameters from the Klesnil–Lukas fit for regions 1 and 2 of the crack propagation curve are taken both from fracture mechanical tests and preliminary studies [70]. First, all tested specimens are projected by means of a bilinear model from the finite-life region to the long-life region.…”

Section: Resultsmentioning

confidence: 99%

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Modification of a Defect-Based Fatigue Assessment Model for Al-Si-Cu Cast Alloys

et al. 2018

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Cast parts usually inherit internal defects such as micro shrinkage pores due to the manufacturing process. In order to assess the fatigue behaviour in both finite-life and long-life fatigue regions, this paper scientifically contributes towards a defect-based fatigue design model. Extensive fatigue and fracture mechanical tests were conducted whereby the crack initiating defect size population was fractographically evaluated. Complementary in situ X-ray computed tomography scans before and during fatigue testing enabled an experimental estimation of the lifetime until crack initiation, acting as a significant input for the fatigue model. A commonly applied fatigue assessment approach introduced by Tiryakioglu was modified by incorporating the long crack threshold value, which additionally enabled the assessment of the fatigue strength in the long-life fatigue regime. The presented design concept was validated utilising the fatigue test results, which revealed a sound agreement between the experiments and the model. Only a minor deviation of up to about five percent in case of long-life fatigue strength and up to about 9% in case of finite-lifetime were determined. Thus, the provided extension of Tiryakioglu’s approach supports a unified fatigue strength assessment of cast aluminium alloys in both the finite- and long-life regimes.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Modification of a Defect-Based Fatigue Assessment Model for Al-Si-Cu Cast Alloys

et al. 2018

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“…SDAS is the characteristic length parameter of the Al−Si alloy, corresponding to the boundary of the α‐Al matrix, and is negatively correlative with the yield stress (YS) and ultimate tensile stress (UTS). [ 14 ] With the decrease in SDAS, the increased grain boundaries inhibit the slip of dislocations, thereby improving the tensile properties. In addition, the morphology of the hard particles also affects the mechanical properties of the alloy.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Performance Analysis of Cast Al−Si Alloy Cylinder Head Using Small Specimens

et al. 2021

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“…These defects, cracks and damages formed on the surface are small in size and shallow in distribution as they have the characteristics of typical 'short crack'. The study found that when other alloys have defects such as micro-notches, the fatigue limit does not meet the traditional linear elastic fracture mechanics theory and the high-cycle fatigue limit design criteria for smooth specimens [25,26]. Therefore, it is necessary to conduct an indepth study on the fatigue mechanical behavior of aluminum alloys with micro-cracks or notches, which will be related to the safety and reliability of aluminum alloys during service.…”

Section: Introductionmentioning

confidence: 99%

Effect of different surface conditions on fatigue properties of 7N01 aluminum alloy and the behavioral mechanism of crack of the alloy under alternating load

Chen

Cai

Deng

et al. 2020

Mater. Res. Express

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In this paper, the surface of 7N01 aluminum alloy profile is sandblasted or electropolished. The influence of different surface conditions on its conditional fatigue strength and fatigue mechanism under the alternating load after prefabricated short crack are studied. Results show that the 7N01 aluminum alloy with sandblasting treatment has formed a work hardened layer and its fatigue strength is increased by 42.9% comparing with the original surface specimens. The fatigue strength of the 7N01 aluminum alloy after electropolishing is almost unchanged compared with the original specimen. The fatigue behavior of the 7N01 aluminum alloy after prefabricated side straight through the notch deviated from the theoretical smooth specimen law and long crack propagation law in which is a 'shortage effect'. When the notch size is smaller than the transition crack size a 0 , the fatigue limit of the notched specimen is lower than the fatigue limit of the smooth specimen. When the notch size is larger than the transition crack size, the fatigue limit of the long-notched specimen is still lower than that predicted by linear elastic fracture mechanics. Due to the 'short notch effect', the effective notch propagation threshold ΔK eff.th of the long crack is 0.39 Mpa m 1/2 based on the effective notch propagation size a 0 eff of the alloy.

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Application of modified Kitagawa-Takahashi diagram for fatigue strength assessment of cast Al-Si-Cu alloys

Cited by 37 publications

References 45 publications

Modification of a Defect-Based Fatigue Assessment Model for Al-Si-Cu Cast Alloys

Modification of a Defect-Based Fatigue Assessment Model for Al-Si-Cu Cast Alloys

Mechanical Performance Analysis of Cast Al−Si Alloy Cylinder Head Using Small Specimens

Effect of different surface conditions on fatigue properties of 7N01 aluminum alloy and the behavioral mechanism of crack of the alloy under alternating load

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