طراحی و تحلیل رفتار مکانیکی یک ساختار مشبک آگزتیک جدید بر پایه مکانیزم صلب چرخنده

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی مکانیک، دانشگاه صنعتی اصفهان، اصفهان، ایران

2 دانشکده مهندسی نساجی، دانشگاه یزد، یزد، ایران

چکیده

مواد آگزتیک با نسبت پواسون منفی به عنوان یکی از انواع فرامواد به دلیل خواص مکانیکی جذاب و قابل توجه، توجه بسیاری از محققین را به خود جلب کرده‌‌اند. سازه‌‌های صلب چرخنده یکی از انواع مواد آگزتیک هستند که با تنظیم متغیرها، رفتار همسانی را در جهات مختلف نشان می‌‌دهند، اما این سازه‌‌ها بدلیل استفاده از بلوک‌‌های صلب دارای چگالی نسبی زیادی می‌‌باشند. از طرفی علی رغم چگالی نسبی بالا این سازه‌‌ها در اتصالات اجزای چرخنده به یکدیگر ضعیف بوده و دارای سفتی و استحکام بالایی نیستند و با توجه به چگالی نسبی بالا خواص ویژه مکانیکی کمی دارند. در این پژوهش یک ساختار مشبک جدید با الهام از سازه‌‌های صلب چرخنده ولی با چگالی نسبی بسیار کمتر ایجاد گردید. برای کاهش چگالی نسبی در این ساختار بجای بلوک‌‌های صلب از المان‌‌های میله‌‌ای استفاده شده است. ساختار جدید با استفاده از فرآیند چاپ سه‌‌بعدی ساخته شد و تحت آزمایش کشش قرار گرفت. با عکس‌‌برداری از ساختار قبل و در حین تغییرشکل، ضریب پواسون آن اندازه‌‌گیری گردید .همچنین با روش اجزای محدود، رفتار تغییرشکل ساختار پیشنهادشده شبیه‌‌سازی و با نتایج تجربی مقایسه شد. هر دو روش نشان‌‌دهنده رفتار آگزتیک ساختار جدید هستند. در ادامه مکانیزم تغییرشکل ساختار و همچنین محدوده‌‌ای از شکل ساختار که رفتار آگزتیک در آن مشاهده می‌‌شود بررسی گردید. 

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Design and analysis of mechanical behavior of a novel lattice auxetic structure based on rigid rotating mechanism

نویسندگان [English]

  • Reza Jafari Nedoushan 1
  • Mohammad Javad Abghary 2
1 Department of Mechanical Engineering, Isfahan University of Technology,, Isfahan, Iran
2 Department of Textile Engineering, Yazd University, Yazd, Iran
چکیده [English]

Auxetic materials with negative Poisson’s ratio, as a group of metamaterials, attracted significant attentions among researchers due to their interesting and remarkable mechanical properties. Rigid rotating structures are a subcategory of auxetic materials which can show the same behavior in various directions by tuning their parameters, but due to using rigid rotating blocks their relative density is high. As the rotating blocks are connected by weak joints, stiffness and strength of these structures are low and considering high relative density of these structures specific mechanical properties are even in worse condition. In this research, novel lattice structures based on rigid rotating structures but with remarkably lower relative density were presented. To reduce relative density of these structures, bar elements were used instead of rigid blocks. 3D printing method was used to manufacture samples with these structures and then tensile test was performed on the samples. Poisson’s ratios of the samples were measured by recording image of the structures before and during deformation. The behavior of the structures was predicted by finite element method and compared with experimental measurements.  Both of the methods showed auxetic behavior of the structures. Then deformation mechanism of the structures and the effect of the structures shape on the auxeticity were investigated.

کلیدواژه‌ها [English]

  • Auxetic structures
  • negative poisson’ ratio
  • lattice structures
  • 3D printing
  • finite element modeling

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نشریه مهندسی مکانیک امیرکبیر
دوره 55، شماره 2
اردیبهشت 1402
صفحه 179-192

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