تأثیر هندسه‌ی سلول‌های داخلی بر عملکرد ضربه‌ای سازه‌های چاپ سه‌بعدی‌شده

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی مکانیک، دانشگاه اراک، اراک، ایران

2 گروه مهندسی مکانیک، دانشکده فنی و مهندسی، دانشگاه آیت الله بروجردی، بروجرد، ایران

3 گروه مهندسی مکانیک، دانشگاه شهرکرد، شهرکرد، ایران

10.61186/masm.4.4.623.
چکیده
بهینه‌سازی هم‌زمان استحکام ضربه‌ای و کاهش وزن، یکی از چالش‌های کلیدی در طراحی سازه‌های صنعتی به‌ویژه در حوزه‌های هوافضا و حمل‌ونقل به شمار می‌آید. هدف این پژوهش، طراحی ساختارهای چاپ سه‌بعدی شده‌ای است که ضمن مصرف حداقل مواد، حداکثر انرژی ضربه‌ای را جذب کنند. برای این منظور، نمونه‌هایی از جنس فیلامنت پلی‌لاکتیک اسید (PLA) با سه هندسه‌ی سلولی مختلف (دایره‌ای، ده‌ضلعی و شش‌ضلعی) و در دو آرایش ساختاری (خطی و مورب) تولید شدند. بررسی رفتار ضربه‌ای این ساختارها با استفاده از آزمون تجربی شارپی و همچنین تحلیل عددی به روش اجزا محدود انجام گرفت. معیارهای ارزیابی شامل انرژی جذب‌شده، جرم نمونه‌ها و مشخصه‌های شکست بودند. نتایج نشان داد که نمونه‌های دارای ساختار شش‌ضلعی، به‌دلیل توزیع یکنواخت‌تر تنش در شبکه داخلی، عملکرد بهتری در جذب ضربه دارند. این نمونه‌ها با وجود ۳۶٪ کاهش جرم، تا ۶۲٪ بهبود در استحکام ضربه‌ای نشان دادند. همچنین، نمونه‌های دارای چیدمان مورب سلول‌ها، با افزایش شکل‌پذیری و ایجاد مفاصل پلاستیک بیشتر، زمان شکست نهایی را تا ۵۷۵٪ افزایش دادند. این یافته‌ها نشان می‌دهد که طراحی بهینه‌ی سلول‌های داخلی می‌تواند بدون افزایش مصرف ماده و علی‌رغم کاهش وزن، استحکام ضربه‌ای را به‌طور چشم‌گیری بهبود دهد و زمینه‌ساز تولید ساختارهای سبک و مقاوم در صنایع پیشرفته باشد..

کلیدواژه‌ها


عنوان مقاله English

Effect of Internal Cellular Geometry on the Impact Performance of 3D-Printed Structures

نویسندگان English

Hossein Kazemi 1
Mohammad Kashfi 2
Leila Soleymani 1
Sayed Hassan Nourbakhsh 3
1 Department of Mechanical Engineering, Arak University of Technology, Arak, Iran.
2 Department of Mechanical Engineering, Faculty of Engineering, Ayatollah Boroujerdi University, Boroujerd, Iran.
3 Department of Mechanical Engineering, Shahrekord University, Shahrekord, Iran
چکیده English

The simultaneous enhancement of impact resistance and reduction of structural weight presents a key challenge in engineering applications, particularly in aerospace and automotive industries. This study aims to develop lightweight high-performance structures by optimizing the internal cellular geometry of 3D-printed components. Polylactic acid (PLA) specimens were fabricated using fused filament fabrication with three cellular patterns (circular, decagonal, and hexagonal), and two orientation schemes (linear and diagonal). The impact behavior of each configuration was evaluated through both experimental Charpy impact tests and finite element simulations. A systematic analysis was performed to assess the influence of cell geometry and orientation on energy absorption, weight reduction, and fracture characteristics. The results revealed that hexagonal cell configurations yielded the highest energy absorption, with up to a 62% increase in impact strength despite a 36% reduction in mass compared to baseline designs. Diagonally oriented cells significantly prolonged fracture duration, showing a 575% increase in time to failure, attributed to the formation of additional plastic hinges and inclined crack paths. These findings demonstrate that strategic internal cell design can substantially improve mechanical performance without additional material usage.

کلیدواژه‌ها English

Charpy test
Finite element analysis
3D Printing
Cellular shapes
PLA filament
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دوره 4، شماره 4
زمستان 1403
صفحه 623-644

  • تاریخ دریافت 02 اردیبهشت 1404
  • تاریخ بازنگری 22 اردیبهشت 1404
  • تاریخ پذیرش 08 خرداد 1404