توسعه ساختار شبکه ای گرادیانی جدید بر اساس سلول واحد بیضوی برای ساخت افزایشی و بررسی خواص آن

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی مکانیک، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران، ایران

چکیده

امروزه استفاده از تکنولوژی پیشرفته ساخت افزودنی، امکان ایجاد ساختارهایی با هندسه‌ی پیچیده و با هزینه‌ی کم را ممکن ساخته‌است. در این پژوهش با الهام از بافت متخلخل چوب ساختار شبکه‌ای گرادیانی بر اساس سلول‌واحد بیضی، طراحی شده‌است. با تغییر تدریجی ابعاد سلول‌واحد بر حسب نسبت ابعادی مختلف و تکرار آن در دو راستای عمود برهم لایه‌ها و با چینش خطی آنها، ساختارهای شبکه‌ای گرادیانی پدید آمده‌است که قابلیت گرادیانی کردن خواص را در تمام نقاط سازه دارد. ویژگی‌های هندسی نمونه‌ها با دقت بسیار خوبی بر اساس روابط تحلیلی برآورد شده‌است خواص مکانیکی از شبیه‌سازی سلول‌های‌واحد، لایه‌ها و سازه‌ها در دو جهت عمود برهم در نرم‌افزار آباکوس بدست‌آمده‌اند. به‌منظور صحت‌سنجی نتایج، نمونه‌ی پلیمری با استفاده از روش پردازش نوری دیجیتال ساخته و تحت آزمایش فشار قرارگرفته‌است. نسبت مدول الاستیک در راستای عرضی به محوری در ساختار یکنواخت برابر 5 و این نسبت با کاهش نسبت تغییرات راستای محوری از 1 به0/75، 8/8 خواهد بود. همچنین با مقایسه‌ی سازه‌های گرادیانی نسبت به یکنواخت، با کاهش 0/3 و 2 درصدی تخلخل با تغییر یکی از ضرایب ابعادی عرضی یا طولی به 0/75، مدول الاستیک به ترتیب 2/6 و 2/77 برابر خواهد‌‌ شد. این طراحی امکان ایجاد قطعاتی سبک با خواص هندسی و مکانیکی سفارشی‌شده براساس اولویت‌های طراحی و قیود هندسی، با انتخاب ضرایب هندسی مناسب را فراهم می‌آورد که می‌تواند در تولید ایمپلنت‌های پزشکی مورد استفاده قرار گیرد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Developing a new functionally graded lattice structure based on an elliptic unit cell for additive manufacturing and investigation of its properties

نویسندگان [English]

  • Hedyeh MojaveryAgah
  • Masood Asgari
Faculty of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran
چکیده [English]

The use of additive manufacturing provides the opportunity to create complex geometries at a low cost. This paper introduces a novel nature-inspired additive manufactured graded lattice structure based on an elliptic unit cell. Altering the unit cells' dimensions by the dimension ratios in each repetition results in a graded layer. Linear tessellated layers provide a highly porous, graded structure whose specific properties can be customized at any spatial location. Geometric features were calculated with high accuracy using analytical analysis. Abaqus simulations were utilized to determine the mechanical properties of unit cells, layers, and lattices. A compression test was conducted on a polymer specimen made by digital light processing (DLP) to validate the results. For a conformal model, the elastic modulus along the latitude axis is five times bigger than the value along the longitude axis. An 8.8-fold increase in the elastic modulus is achievable by decreasing the longitude ratio from 1 to 0.75. A reduction of 0.3% in porosity by setting the longitude ratio to 0.75 and a decrease of 2% in porosity by lessening the latitude ratio to 0.75 results in increases of 2.6 and 2.77 folds in the elastic modulus along two directions, respectively. It is possible to tailor geometrical and mechanical properties to meet any design preference by selecting the proper dimension ratios, which can be utilized for medical implant design.

کلیدواژه‌ها [English]

  • Lattice structure
  • Graded porous material
  • Additive manufacturing
  • Nature-inspired
  • Mechanical properties
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