کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6777204 1432060 2018 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dynamic crushing response of auxetic honeycombs under large deformation: Theoretical analysis and numerical simulation
ترجمه فارسی عنوان
واکنش خرد کردن دینامیکی سلولهای عقلانی تحت تغییر شکل بزرگ: تجزیه و تحلیل نظری و شبیه سازی عددی
کلمات کلیدی
لانه زنبوری مجزا، نسبت پواسون منفی، ضربه، تغییر شکل بزرگ، تجزیه و تحلیل نظری،
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی
In order to comprehensively understand the dynamic response of auxetic honeycombs, theoretical analysis are conducted to predict the NPR effect and the crushing stress of the re-entrant hexagonal honeycomb. The honeycomb's crushing stress is a function of the cell's geometric parameters, crushing velocity and the mechanical property of the cell-wall material. Results show that the crushing stress enhances with the increasing crushing velocity. A dynamic sensitivity index is employed to quantitatively evaluate this enhancement. It is shown that small cell-wall angle, low relative density or high cell-wall length ratio of the honeycomb attribute high velocity-sensitivity to the crushing stress. The Poisson's ratio of the re-entrant honeycomb is also expressed as a function of the cell's geometric parameters. It is revealed that the NPR effect enhances with the increasing cell-wall angle and the decreasing cell-wall length ratio. All the theoretical predictions are verified by numerical simulations. Besides, an interesting phenomenon is noticed that the crushing velocity has significant influence on the honeycomb's NPR effect at the early stage of crushing. However, this influence almost vanishes when the overall strain is larger than about 0.2. This present work is supposed to shed light on the design of the auxetic honeycomb.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thin-Walled Structures - Volume 131, October 2018, Pages 373-384
نویسندگان
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