کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7177574 1467032 2018 48 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Plastic deformation and failure mechanisms in nano-scale notched metallic glass specimens under tensile loading
ترجمه فارسی عنوان
مکانیزم تغییر شکل پلاستیک و مکانیزم شکست در نمونه های شیشه ای متخلخل نانو مقیاس تحت بارگذاری کششی
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
چکیده انگلیسی
In this work, numerical simulations using molecular dynamics and non-local plasticity based finite element analysis are carried out on tensile loading of nano-scale double edge notched metallic glass specimens. The effect of acuteness of notches as well as the metallic glass chemical composition or internal material length scale on the plastic deformation response of the specimens are studied. Both MD and FE simulations, in spite of the fundamental differences in their nature, indicate near-identical deformation features. Results show two distinct transitions in the notch tip deformation behavior as the acuity is increased, first from single shear band dominant plastic flow localization to ligament necking, and then to double shear banding in notches that are very sharp. Specimens with moderately blunt notches and composition showing wider shear bands or higher material length scale characterizing the interaction stress associated with flow defects display profuse plastic deformation and failure by ligament necking. These results are rationalized from the role of the interaction stress and development of the notch root plastic zones.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the Mechanics and Physics of Solids - Volume 111, February 2018, Pages 393-413
نویسندگان
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