کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7168593 1463029 2018 29 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Instability of rapidly accelerating rupture fronts in nanostrips of monolayer hexagonal boron nitride
ترجمه فارسی عنوان
ناپایداری جبهه شکست سریع به سرعت در نانوساختارهای نیترویید بور شش ضلعی یکنواخت
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
چکیده انگلیسی
A molecular structural mechanics model of monolayer hexagonal boron nitride is constructed by finite element (FE) method, in which BN bonds are equated with Timoshenko beam elements. Edge crack is introduced in nanostrip of FE model. Crack propagates straight and smoothly under pure opening displacement-loading, and crack speed reaches up to a stable value of 8.45 km/s finally at tensile loading rate 3.33 m/s of both upper and bottom boundaries. While crack branching or kinking occurs beyond critical speeds of 8.74 km/s and 8.71 km/s at higher loading rates of 16.67 m/s and 8.33 m/s respectively, with the formation of non-trivial crack surfaces. The above results are also examined by molecular dynamics models of the same sizes and geometry. Simultaneously, the critical energy release rate is equal to 0.136 TPa·Å at a critical tensile strain 8.27% with the occurrences of crack instabilities. Moreover, critical strains of crack initiation 5.75% and branching 8.27% are independent of displacement-loading rates.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Engineering Fracture Mechanics - Volume 200, September 2018, Pages 115-124
نویسندگان
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