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

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Modification of a Defect-Based Fatigue Assessment Model for Al-Si-Cu Cast Alloys. / Aigner, Roman; Leitner, Martin; Stoschka, Michael et al.
in: Materials, Jahrgang 11, Nr. 12, 2018.

Publikationen: Beitrag in FachzeitschriftArtikelForschung(peer-reviewed)

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@article{f1e0ad8b1c254d9193bdad6db6572f4d,
title = "Modification of a Defect-Based Fatigue Assessment Model for Al-Si-Cu Cast Alloys",
abstract = "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.",
author = "Roman Aigner and Martin Leitner and Michael Stoschka and Christian Hannesschl{\"a}ger and Thomas Wabro and Robert Ehart",
year = "2018",
doi = "10.3390/ma11122546",
language = "English",
volume = "11",
journal = "Materials",
issn = "1996-1944",
publisher = "Multidisciplinary Digital Publishing Institute (MDPI)",
number = "12",

}

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TY - JOUR

T1 - Modification of a Defect-Based Fatigue Assessment Model for Al-Si-Cu Cast Alloys

AU - Aigner, Roman

AU - Leitner, Martin

AU - Stoschka, Michael

AU - Hannesschläger, Christian

AU - Wabro, Thomas

AU - Ehart, Robert

PY - 2018

Y1 - 2018

N2 - 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.

AB - 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.

U2 - 10.3390/ma11122546

DO - 10.3390/ma11122546

M3 - Article

VL - 11

JO - Materials

JF - Materials

SN - 1996-1944

IS - 12

ER -