مطالعه تجربی خستگی خمشی قطعات چاپ سه‎بعدی ساخته‌شده با روش ریزش مذاب

نوع مقاله : مقاله علمی

نویسندگان
1 دانشگاه صنعتی نوشیروانی بابل، بابل، ایران
2 گروه ساخت و تولید، دانشکده مهندسی مکانیک، دانشگاه صنعتی نوشیروانی بابل، بابل، ایران
چکیده
امروزه قطعات پلیمری ساخته شده با روش‌های ساخت افزودنی در صنایع مختلف کاربردهای متعددی دارند. پارامترهای مختلفی بر کیفیت چاپ قطعات و متعاقباً خواص مکانیکی و سطحی آن‌ها تأثیر می‌گذارند. در این مقاله، تأثیر فاکتورهای چاپ سه‌بعدی شامل ارتفاع لایه‌ها، سرعت و دمای چاپ بر عمر خستگی نمونه‌های پلیمر پلی‌لاکتیک‌اسید (PLA) چاپ‌شده با روش مدل‌سازی رسوب ذوب‌شده (FDM) بررسی شده است. ارتفاع لایه‎ها 2/0، 25/0 و 3/0 میلی‌متر، سرعت چاپ 1000، 1400 و 1800 میلی‌متر بر دقیقه و دمای چاپ 205، 215 و 225 درجه ‌سانتی‌گراد‌، همگی با درصد پرشدگی 100 درصد درنظر گرفته شده است. بدین منظور 15 پیکربندی مختلف در نرم‌افزار Minitab با استفاده از روش Box-Behnken برای ارزیابی آزمایشگاهی این عوامل ایجاد شد. عمر خستگی نمونه‌ها با استفاده از دستگاه خستگی دورانی سنتام با سرعت ثابت 5 هرتز بدست آمد. سپس با استفاده از مدل‌های رگرسیون خطی و غیرخطی مرتبه دوم و برازش داده­های آزمایشگاهی، تابع تخمین عمر خستگی با استفاده از بسته scikit-learn در Python استخراج گردیدپلی. بررسی‌ها نشان می‌دهد نتایج حاصل از رگرسیون غیرخطی قابل اعتماد بوده و دچار برازش بیش از حد (over fitting) نیز نمی‌گردد. همچنین نتایج نشان می‌دهد که هر چه سرعت چاپ و ارتفاع لایه‌ها افزایش یابد، عمر خستگی نمونه‌ها به دلیل کاهش کیفیت مکانیکی و سطحی نمونه‌ها، کاهش می‌یابد. علاوه بر این، اگرچه دمای چاپ تأثیر زیادی بر عمر خستگی ندارد؛ اما تغییرات آن غیرخطی بوده و با استفاده از تخمین رگرسیون غیرخطی، دمای بهینه 213 درجه در محدوده‌ی دمای چاپ 205 الی 225 درجه ‌سانتی‌گراد‌ بدست آمده است.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Experimental Study on Bending Fatigue of 3D-Printed Specimens Fabricated via Fused Deposition Modeling

نویسندگان English

Ammar watheg Younus 1
Ali Hassani 1
Abbas Zolfaghari 2
1 Department of Solid Design, Faculty of Mechanical Engineering, Babol Noshirvani University of Technology, Babol, Iran
2 Department of Manufacturing, Faculty of Mechanical Engineering, Babol Noshirvani University of Technology, Babol, Iran
چکیده English

Polymer components manufactured using additive manufacturing (AM) methods have many applications in various industries. Different parameters affect the quality of parts’ printing, and subsequently their mechanical and surface properties. In this paper, the effect of 3D printing factors including layer height, printing speed, and temperature on the fatigue life of PLA specimens printed by the Fused Deposition Modeling is investigated. Layer heights of 0.2, 0.25, and 0.3 mm, printing speeds of 1000, 1400, and 1800 mm/min, and printing temperatures of 205, 215, and 225°C, all with an infill density of 100%, are considered. For this purpose, 15 different configurations were created in Minitab using the Box-Behnken method for laboratory evaluation. The fatigue life of specimens was obtained using a SANTAM rotational fatigue machine at a constant speed of 5 Hz. Then, using linear and nonlinear second-order regression models and fitting the experimental data, the fatigue life estimation function was extracted using the scikit-learn package in Python. Studies show that the results obtained from nonlinear regression are reliable and do not suffer from overfitting. The results also show that as the printing speed and layer height increase, the fatigue life of specimens decreases due to the reduction in the mechanical and surface quality of the samples. In addition, although the printing temperature does not have a large effect on the fatigue life; its changes are nonlinear, and using nonlinear regression estimation, the optimal temperature of 213 degrees in the printing temperature range of 205 to 225 degrees Celsius has been obtained.

کلیدواژه‌ها English

3D printing
PLA polymer
Rotating fatigue test
Fatigue life estimation
Linear and non-linear regressions
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  • تاریخ دریافت 08 بهمن 1403
  • تاریخ بازنگری 26 اسفند 1403
  • تاریخ پذیرش 10 فروردین 1404
  • تاریخ اولین انتشار 10 فروردین 1404
  • تاریخ انتشار 10 فروردین 1404