کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10140204 | 1645996 | 2018 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Crack arrest testing at the micro-scale
ترجمه فارسی عنوان
تست دستگیری را در مقیاس میکرو انجام دهید
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
دستگیری کراک، میکرومکانیک، اهن، مکانیک شکستگی، تجزیه و تحلیل عنصر محدود،
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی مکانیک
چکیده انگلیسی
Crack arrest testing of micro-sized cantilever beams (â8â¯Ãâ¯4â¯Ãâ¯6â¯Î¼m, length, width and height, respectively) was conducted in order to evaluate the suitability of a new method to quantify local crack arrest properties. Chevron notched cantilevers were milled to match the (1â¯0â¯0)[0â¯1¯â¯1] crack system in α-iron, where earlier attempts to obtain brittle or rapidly propagating fracture proved difficult. Brittle crack initiation and propagation was achieved by means of the deposition of a layer of SiOX on the surface, acting as a brittle starter. All tests were performed at â75â¯Â°C, using an in-house designed cooling system. The cracks arrested after propagation into the iron cantilever. A finite element model was developed to determine the appropriate dimensionless shape factor and provide a rigorous computer analysis of these complexly shaped cantilevers. KQC and KQa, at initiation and arrest respectively, were determined and evaluated. The cantilevers were later displaced further at 40â¯K to allow evaluation of crack jump lengths and to obtain a more complete analysis of the fracture surfaces. The average fracture toughness was determined to be 3.89â¯Â±â¯1.00â¯MPam, and the average arrest toughness to be 2.6â¯Â±â¯0.86â¯MPam. The finite element model highlights the effect of small variations in geometry which was larger than anticipated and strongly affects the shape factor, up to a 25% difference in f(a/W). As small variations in geometry are inevitable when milling with FIB, the need for individual models tailored to every cantilever is discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Engineering Fracture Mechanics - Volume 201, 1 October 2018, Pages 157-166
Journal: Engineering Fracture Mechanics - Volume 201, 1 October 2018, Pages 157-166
نویسندگان
Brage Dahl Snartland, Antonio Alvaro, Vidar Osen, Christian Thaulow,