کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5016639 | 1465574 | 2017 | 50 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A unified theory of plasticity, progressive damage and failure in graphene-metal nanocomposites
ترجمه فارسی عنوان
نظریه ی یکپارچه ی پلاستیسیته، آسیب پیشرونده و شکست نانوکامپوزیت های فلزی گرافن
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کلمات کلیدی
پلاستیک آسیب پیشروانه، شکست، نانوکامپوزیت های فلزی گرافن، اثرات واسط نامناسب، همگن سازی دو مقیاس،
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی مکانیک
چکیده انگلیسی
Several experiments have shown that, with a small amount of graphene volume concentration, the maximum strength of graphene-metal nanocomposites could increase notably while its failure strain decrease drastically, but at present no theory seems to exist to explain these opposing trends. In this paper we present a unified theory of plasticity and progressive damage that ultimately leads to the failure of composite. The theory is written in a two-scale framework, with the small scale constituting the ductile matrix and the microvoids generated during progressive damage, and the large scale combining the damaged metal matrix with 3-D randomly oriented graphene. To calculate the overall stress-strain relations the method of field fluctuation and interface effect are both considered, and to assess the evolution of microvoids during progressive damage a new damage potential is suggested. The final outcome is a simple and analytical model for the strength and ductility of the nanocomposite. We highlight the developed theory with a direct application to reduced graphene oxide/copper (rGO/Cu) nanocomposites, and demonstrate how, in line with experiments, the tensile strength can increase by 40% and the failure strain can drop from 0.39 to 0.14 as graphene volume concentration increases from 0 to 2.5Â vol%. The rapid increase of damage effect at high graphene volume concentration was found to be responsible for the sharp drop of ultimate strain.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Plasticity - Volume 99, December 2017, Pages 58-80
Journal: International Journal of Plasticity - Volume 99, December 2017, Pages 58-80
نویسندگان
Xiaodong Xia, Yu Su, Zheng Zhong, George J. Weng,