Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 133, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2019.105423
Keywords
Cast aluminium surface layer; Fatigue strength; Areal roughness parameter; Sub-area analysis; Porosity
Funding
- Austrian Federal Ministry for Digital and Economic Affairs
- National Foundation for Research, Technology and Development
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The fatigue strength of cast aluminium surface layers is significantly affected by casting imperfections. Experimental work reveals crack initiation due to three failure modes; microporosity, cast surface texture as well as a combination of both. A novel local sub-area evaluation of notch factors for surface texture characterisation utilises areal surface texture by pit depth values Sv(local), ranging within several hundred microns, and related notch root radii (rho) over bar distributions. Additionally, the cast bulk strength is calculated by Murakami's approach. For all three failure cases, the presented holistic fatigue layer strength assessment methodology is well applicable for sand cast aluminium.
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