مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

بهینه سازی شرایط فرآیندی چاپ سه بعدی FDM قطعات پلیمری زیست تخریب پذیر پلی لاکتیک اسید

نوع مقاله : پژوهشی اصیل

نویسندگان
رزگار حسن زاده
طاهر ازدست
دکتری تخصصی مهندسی مکانیک، دانشکده فنی و مهندسی، دانشگاه ارومیه، ارومیه، ایران
چکیده
در تحقیق حاضر، بررسی خواص مکانیکی قطعات پلی لاکتیک اسید تولید شده با روش چاپگر سه بعدی FDM انجام گرفته است. بررسی و بهینه­سازی شرایط فرآیندی چاپ سه بعدی توسط روش طراحی آزمایش (DOE) تاگوچی به منظور بهبود خواص قطعات پلی لاکتیک اسید در دستور کار قرار گرفته است. درصد پرشدگی (در سه سطح 30، 50 و 70 درصد)، زاویه رستر (در سه حالت 0/90، 30/30- و 45/45- درجه) و ضخامت لایه (در سه سطح 200، 250 و 300 میکرومتر) به عنوان پارامترهای فرآیندی انتخاب شده و اثر آن­ها بر روی چگالی (به عنوان معیاری از تخلخل)، استحکام به ضربه (به عنوان معیاری از خواص مکانیکی) و استحکام به ضربه ویژه (نسبت استحکام به ضربه به چگالی) بررسی شده است. از آنالیز واریانس (ANOVA) به منظور شناسایی پارامترهای موثر فرآیندی استفاده گردید. نتایج نشان دادند که درصد پرشدگی موثرترین پارامتر بر روی چگالی و استحکام به ضربه می­باشد و با کاهش آن، چگالی و استحکام به ضربه کاهش می­یابند و این کاهش به گونه­ای است که نسبت آن­ها (استحکام به ضربه ویژه) تغییرات اندکی را تجربه می­کند. ضخامت لایه موثرترین پارامتر بر روی استحکام به ضربه ویژه بود و با کاهش آن، استحکام به ضربه و استحکام به ضربه ویژه به دلیل تداخل رسترها افزایش یافت. شرایط بهینه برای دست­یابی به بهترین خواص مکانیکی شامل زاویه رستر 30/30- درجه و ضخامت لایه 200 میکرومتر بود و درصد پرشدگی بایستی نسبت به کاربرد مدنظر بهینه گردد.
کلیدواژه‌ها
چاپگر سه بعدی
زیست تخریب پذیر
پلی‌لاکتیک اسید
خواص مکانیکی
بهینه‌سازی
FDM

موضوعات

عنوان مقاله English

Optimization of FDM 3D Printing Process Parameters of Biodegradable Poly Lactic Acid Polymeric Samples

نویسندگان English

Rezgar Hasanzadeh
Taher Azdast
Ph.D., Mechanical Engineering, Faculty of Engineering, Urmia University, Urmia, Iran
چکیده English

In this study, the mechanical properties of poly lactic acid samples produced by FDM 3D printing technique were investigated. The 3D printing process parameters were optimized using design of experiment (DOE) Taguchi approach for achieving the optimum mechanical performance. In this regard, infill percentage (at three levels of 30, 50, and 70%), raster angle (at three states of 0/90, -30/30, and -45/45 degree), and layer thickness (at three levels of 200, 250, and 300 µm) were considered as process parameters for optimization procedure. Their effects on density (as porosity degree), impact strength (as mechanical property), and specific impact strength (the impact strength to density ratio) were investigated. Analysis of variance (ANOVA) was utilized to find the most effective processing parameters. The findings revealed that the infill percentage was the most effective parameter on the density and the impact strength. The density and the impact strength were reduced with the decrease of the infill percentage. These decrements were in a way that their ratio, specific impact strength, was almost constant. The layer thickness had the most influence on the specific impact strength. The specific impact strength was improved by reducing the layer thickness due to the raster entanglement. The optimum conditions to achieve the highest mechanical performance were the raster angle of 30/-30 degree and the layer thickness of 200 µ. The optimum infill percentage depended on the application.

کلیدواژه‌ها English

3D printing
Biodegradable
poly lactic acid
Mechanical properties
Optimization
FDM
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مهندسی مکانیک مدرس
دوره 21، شماره 2
بهمن 1399
صفحه 69-78