کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
800098 1467444 2016 19 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effective in-plane elastic properties of auxetic honeycombs with spatial irregularity
ترجمه فارسی عنوان
خواص انعطاف پذیری هواپیما در هواپیما های عصبی با ناهماهنگی فضایی
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
چکیده انگلیسی


• Equivalent elastic moduli of irregular auxetic honeycombs are analysed.
• Closed-form analytical formulae are presented.
• Spatially random cell angles are considered.

An analytical framework has been developed for predicting the equivalent in-plane elastic moduli (longitudinal and transverse Young’s modulus, shear modulus, Poisson’s ratios) of irregular auxetic honeycombs with spatially random variations in cell angles. Employing a bottom up multi-scale based approach, computationally efficient closed-form expressions have been derived in this article. This study also includes development of a highly generalized finite element code capable of accepting number of cells in two perpendicular directions, random structural geometry and material properties of irregular auxetic honeycomb and thereby obtaining five in-plane elastic moduli of the structure. The elastic moduli obtained for different degree of randomness following the analytical formulae have been compared with the results of direct finite element simulations and they are found to be in good agreement corroborating the validity and accuracy of the proposed approach. The transverse Young’s modulus, shear modulus and Poisson’s ratio for loading in transverse direction (effecting the auxetic property) have been found to be highly influenced by the structural irregularity in auxetic honeycombs.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Mechanics of Materials - Volume 95, April 2016, Pages 204–222
نویسندگان
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