علوم و فناوری کامپوزیت

بررسی تجربی و عددی قابلیت جذب انرژی ساختار مشبک دو ماده ای

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی مکانیک، دانشگاه تربیت مدرس

2 دانشیار دانشکده مکانیک دانشگاه تربیت مدرس

چکیده

مقاله حاضر عملکرد مکانیکی و ظرفیت جذب انرژی ساختار مشبک سه بعدی دو ماده را از طریق رویکرد تجربی و عددی بررسی می‌کند. در ابتدا، با استفاده از ساخت افزایشی بخش بیرونی ساختار مشبک سه بعدی پیشنهادی با ماده ماده ترمو پلاستیک پلی اورتان ساخته شده است. با استفاده از یک سرنگ، رزین اپوکسی به قسمت داخلی ساختار مشبک تولید شده تزریق می‏شود. سپس، آزمایش‌های فشرده‌سازی برای تجزیه و تحلیل خواص مکانیکی و ظرفیت جذب انرژی ساختار مشبک سه‌بعدی دو ماده انجام شده است. مطالعه عددی غیرخطی، رفتار الاستو -پلاستو-آسیب در آنالیزهای المان محدود که پاسخ غیرخطی ساختار‌های در نظر گرفته شده را دنبال می‌کند، اجرا شده است. این مدل قادر است تفاوت خواص کششی و فشاری مواد را نیز بررسی کند. منحنی نیرو-جابجایی ساختار مشبک تحت بارگذاری فشاری مقایسه شده است. مدل‌ عددی پیش‌بینی قابل قبولی در مورد پاسخ‌های خطی و غیرخطی ساختار مشبک سه‌بعدی پیشنهادی نشان می‌دهند. نتایج نشان می‌دهد که نه تنها استفاده از ساختارهای مشبک دو ماده‏ای باعث جذب انرژی بیشتر و بهبود خواص مکانیکی می‌شود، بلکه ترکیب منطقی دو ماده باعث می‌شود ساختار مشبک سه بعدی دو ماده با جذب انرژی و سفتی بهینه در مقایسه با ساختارهای مشبک معمولی با یک ماده واحد داشته باشد.

کلیدواژه‌ها

عنوان مقاله [English]

Experimental and numerical investigation of the energy absorption capability of the bi-material lattice structure

نویسندگان [English]

  • Hussain Gharehbaghi 1
  • amin farrokhabadi 2

1 Department of Mechanical Engineering. Tarbiat Modares University.

2 Department of Mechanical Engineering, Tarbiat Modares University.

چکیده [English]

This paper investigates the mechanical performance and energy absorption capacity of bi-material three-dimensional lattice structures via experimental and numerical approaches. At first, fused deposition modeling was used to manufacture the outer part of the proposed three-dimensional lattice structure with TPU material. Using a syringe, epoxy resin is injected into the inner part of the manufactured lattice structure. Then, quasi-static compression tests were conducted to analyze the mechanical properties and energy absorption capacity of the bi-material three-dimensional lattice structure. As the nonlinear numerical study, the elasto-plasto-damage behavior was implemented in finite element analyses which track the nonlinear response of considered structures. This model is capable to investigate the differences in tensile and compressive properties of the materials as well. The comparison of the load-displacement curve of structures under compressive loading has been compared. The numerical models exhibit an acceptable prediction about the linear and nonlinear responses of the proposed three-dimensional lattice structure. The results reveal that not only does the use of hybrid structures provide more energy absorption and improve mechanical properties, but also the rational combination of two materials makes the bi-material three-dimensional lattice structure with the optimum energy absorption and stiffness, in comparison to those usual lattice structures with a single material.

کلیدواژه‌ها [English]

  • Additive manufacturing
  • Elasto-plasto-damage
  • Nonlinear FEM
مراجع
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علوم و فناوری کامپوزیت
دوره 9، شماره 2
شهریور 1401
صفحه 1976-1982
فایل ها
هم رسانی
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