کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
799427 1467062 2015 17 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Optimization design of strong and tough nacreous nanocomposites through tuning characteristic lengths
ترجمه فارسی عنوان
طراحی بهینه سازی نانوکامپوزیت های قوی و سخت براق از طریق تنظیم طول مشخصه
کلمات کلیدی
نانوکامپوزیتهای برنجی، استحکام، سختی، طراحی میکروارگانیسم مدل برش برشی
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
چکیده انگلیسی


• Effects of staggered length and interfacial plasticity in nacre are discussed.
• Two characteristic lengths in optimizing the strength and toughness are identified.
• A parametric selection guideline designing optimal nacreous composites is proposed.

How nacreous nanocomposites with optimal combinations of stiffness, strength and toughness depend on constituent property and microstructure parameters is studied using a nonlinear shear-lag model. We show that the interfacial elasto-plasticity and the overlapping length between bricks dependent on the brick size and brick staggering mode significantly affect the nonuniformity of the shear stress, the stress-transfer efficiency and thus the failure path. There are two characteristic lengths at which the strength and toughness are optimized respectively. Simultaneous optimization of the strength and toughness is achieved by matching these lengths as close as possible in the nacreous nanocomposite with regularly staggered brick-and-mortar (BM) structure where simultaneous uniform failures of the brick and interface occur. In the randomly staggered BM structure, as the overlapping length is distributed, the nacreous nanocomposite turns the simultaneous uniform failure into progressive interface or brick failure with moderate decrease of the strength and toughness. Specifically there is a parametric range at which the strength and toughness are insensitive to the brick staggering randomness. The obtained results propose a parametric selection guideline based on the length matching for rational design of nacreous nanocomposites. Such guideline explains why nacre is strong and tough while most artificial nacreous nanocomposites aere not.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the Mechanics and Physics of Solids - Volume 81, August 2015, Pages 41–57
نویسندگان
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