Short-Crack Growth Behavior in Additively Manufactured AlSi10Mg Alloy
| العنوان: | Short-Crack Growth Behavior in Additively Manufactured AlSi10Mg Alloy |
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| المؤلفون: | Srinivasan Arjun Tekalur, J. Wayne Jones, Qianying Shi, Jason W. Carroll, Robert K. Rhein |
| المصدر: | Journal of Materials Engineering and Performance. 30:5392-5398 |
| بيانات النشر: | Springer Science and Business Media LLC, 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | 010302 applied physics, Materials science, Mechanical Engineering, Alloy, chemistry.chemical_element, Fracture mechanics, 02 engineering and technology, engineering.material, Paris' law, 021001 nanoscience & nanotechnology, 01 natural sciences, Fatigue limit, Stress (mechanics), chemistry, Mechanics of Materials, Aluminium, 0103 physical sciences, Crack initiation, engineering, Ct technique, General Materials Science, Composite material, 0210 nano-technology |
| الوصف: | The very high cycle fatigue (VHCF) behavior of an additively manufactured aluminum alloy, AlSi10Mg-T6, has been studied to better understand the role of process-related defects on fatigue life and, in particular, initiation and small crack propagation behavior. Ultrasonic fatigue methodologies were used for the determination of an operative fatigue strength for lifetimes in the range of 108-109 cycles. Fatigue crack growth rates were determined for small fatigue cracks that initiated and grew from artificially produced (FIB) surface defects in specimens subjected to ultrasonic fatigue. X-ray computed tomography (CT) was used in an effort to detect possible crack initiation and growth in specimens cycled for fractions of the nominal VHCF fatigue strength. From the baseline fatigue experiments using fully reversed loading (R = − 1), a nominal fatigue strength of 90 MPa was established for lifetimes in the 108-109 range, and this maximum stress value was used in subsequent crack growth and CT studies. Using ultrasonic fatigue allowed very slow average crack growth rates on the order of 10−11 m/cycle at a °ΔK of 1.5 Mpa m1/2. Small crack growth from FIB-produced micronotches appeared to be transgranular and non-crystallographic. While modest increase in size of some features identified by x-ray CT for interrupted fatigue tests, particularly at defects characterized as flat or oblate spheroids, no definitive evidence of the emergence of a fatal crack from a single defect was observed. This contrasts with the fatigue behavior of as-built AM AlSi10Mg alloy, where porosity-dominated fatigue crack initiation and the size and type of defects can be correlated with fatigue lifetimes. |
| تدمد: | 1544-1024 1059-9495 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::551ae6138c41c73831fb5bb72ad2c388 https://doi.org/10.1007/s11665-021-05820-2 |
| حقوق: | CLOSED |
| رقم الأكسشن: | edsair.doi...........551ae6138c41c73831fb5bb72ad2c388 |
| قاعدة البيانات: | OpenAIRE |
Find this article in full text from Springer Verlag. | تدمد: | 15441024 10599495 |
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