کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7177523 1467031 2018 42 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Discrete-element modeling of nacre-like materials: Effects of random microstructures on strain localization and mechanical performance
ترجمه فارسی عنوان
مدل سازی عناصر گسسته مواد براق مانند: اثرات ریزساختاری های تصادفی بر مکان بندی کرنش و عملکرد مکانیکی
کلمات کلیدی
مدل سازی عنصر گسسته، کامپوزیت های متمرکز مواد زیستی و بیولوژیکی، نارر، استخوان
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
چکیده انگلیسی
Natural materials such as nacre, collagen, and spider silk are composed of staggered stiff and strong inclusions in a softer matrix. This type of hybrid microstructure results in remarkable combinations of stiffness, strength, and toughness and it now inspires novel classes of high-performance composites. However, the analytical and numerical approaches used to predict and optimize the mechanics of staggered composites often neglect statistical variations and inhomogeneities, which may have significant impacts on modulus, strength, and toughness. Here we present an analysis of localization using small representative volume elements (RVEs) and large scale statistical volume elements (SVEs) based on the discrete element method (DEM). DEM is an efficient numerical method which enabled the evaluation of more than 10,000 microstructures in this study, each including about 5,000 inclusions. The models explore the combined effects of statistics, inclusion arrangement, and interface properties. We find that statistical variations have a negative effect on all properties, in particular on the ductility and energy absorption because randomness precipitates the localization of deformations. However, the results also show that the negative effects of random microstructures can be offset by interfaces with large strain at failure accompanied by strain hardening. More specifically, this quantitative study reveals an optimal range of interface properties where the interfaces are the most effective at delaying localization. These findings show how carefully designed interfaces in bioinspired staggered composites can offset the negative effects of microstructural randomness, which is inherent to most current fabrication methods.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the Mechanics and Physics of Solids - Volume 112, March 2018, Pages 385-402
نویسندگان
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