کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1445670 1509603 2014 16 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Flaw tolerance vs. performance: A tradeoff in metallic glass cellular structures
ترجمه فارسی عنوان
تحمل ضعف در مقابل عملکرد: یک معامله در ساختارهای سلولی شیشه ای فلزی
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی

Stochastic cellular structures are prevalent in nature and engineering materials alike. They are difficult to manipulate and study systematically and almost always contain imperfections. To design and characterize various degrees of imperfections in perfect periodic, stochastic and natural cellular structures, we fabricate a broad range of metallic glass cellular structures from perfectly periodic to highly stochastic by using a novel artificial microstructure approach based on thermoplastic replication of metallic glasses. For these cellular structures, precisely controlled imperfections are implemented and their effects on the mechanical response are evaluated. It is found that the mechanical performance of the periodic structures is generally superior to that of the stochastic structures. However, the stochastic structures experience a much higher tolerance to flaws than the periodic structure, especially in the plastic regime. The different flaw tolerance is explained by the stress distribution within the various structures, which leads to an overall "strain-hardening" behavior of the stochastic structure compared to a "strain-softening" behavior in the periodic structure. Our findings reveal how structure, "strain-hardening" and flaw tolerance are microscopically related in structural materials.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 73, July 2014, Pages 259–274
نویسندگان
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