An apparatus for four-point bending fatigue testing of materials in a scanning electron microscope and its application to nodular cast iron |
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| Affiliation: | 1. Department of Mechanical Engineering, McGill University, Montreal, Canada;2. Department of Mining and Metallurgical Engineering, McGill University, Montreal, Canada;1. Shahid Beheshti University, Tehran, Iran;2. Shahid Beheshti University of Medical Sciences, Tehran, Iran;3. University of Tehran, Tehran, Iran;4. Marquette University School of Dentistry, Milwaukee, WI, United States;5. University of Sheffield, Sheffield, United Kingdom;6. North Carolina State University, Raleigh, NC, United States;1. Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia;2. Mekong Regional Futures Institute, 399 Interchange 21 Building, level, 32 Sukhumvit Rd, North Klongtoey, Wattana, Bangkok 10110, Thailand;3. CSIRO Land and Water Flagship, PMB 2, Glen Osmond, SA 5064, Australia;1. Department of Mechanical Engineering, University of New Hampshire, Durham, NH, 03824, USA;2. Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA;1. Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany;2. Technische Universität Berlin, Strasse des 17. Juni 135, 10623 Berlin, Germany |
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| Abstract: | The design and construction of an apparatus to study four-point bending fatigue testing in a scanning electron microscope is described. This instrument allows the propagation of a fatigue crack through the sample microstructure to be followed in detail. Loads on the sample as well as sample displacement can be measured during testing. Design of the accompanying software is also described, as are the results of preliminary tests on nodular cast iron. A close relationship between the fatigue crack path and the sample microstructure is noted, particularly in the brittle graphite phase. |
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