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تحلیل اثر جهت چاپ و بارگذاری بر خواص مکانیکی و رفتار شکست پلیمر پلیلاکتیک اسید تولیدشده با روش ساخت افزایشی | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| دوره 57، شماره 3، خرداد 1404، صفحه 379-398 اصل مقاله (1.63 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2025.24127.7843 | ||
| نویسندگان | ||
| الیاس حدادی* 1؛ محمدرضا آدی بیگ2؛ ابوذر اسحقی اسکویی3، 4 | ||
| 1گروه مهندسی مکانیک، دانشگاه ملی مهارت، تهران، ایران | ||
| 2دانشکده مهندسی مکانیک، دانشگاه علم و صنعت جنوب، شنزن، چین | ||
| 3موسسه موگانشان، دیچینگ، چین | ||
| 4آزمایشگاه ماشینهای دوار پرسرعت، دانشگاه جیجیانگ، هانگژو، چین | ||
| چکیده | ||
| خواص مکانیکی و مقاومت در برابر رشد ترک نمونههای پلیلاکتیک اسید تولیدشده به روش ساخت افزایشی مورد بررسی قرار گرفت. هدف اصلی، ارزیابی تأثیر جهتگیری چاپ بر رفتار مکانیکی نمونهها تحت بارهای کششی و برشی بود. نمونهها در سه جهت چاپ ˚0، ˚90 و ˚09/˚0 تهیه شدند. این جهتگیریها به ترتیب نشاندهنده چاپ لایهها در راستای طولی، عرضی و ترکیبی بودند. نتایج نشان داد که تغییر جهت چاپ از ˚0 به ˚90 یا ˚09/˚0 باعث افزایش قابلتوجه بیشینه تنش کششی به میزان حدود %39 و کرنش پیش از شکست بهطور متوسط %30 شد. این امر به دلیل تفاوت در چیدمان لایهها و توزیع تنش در ساختار داخلی نمونهها بود. برای بررسی مقاومت در برابر رشد ترک، از آزمونهای شکست در مودهای کششی و برشی استفاده شد. نمونههای پروانهای شکل و با گیره آرکان اصلاحشده آزمایش شدند. همچنین ضرایب هندسی متناظر با جهات بارگذاری با استفاده از شبیهسازی المان محدود استخراج شد. نتایج نشان داد که مقادیر بحرانی انرژی شکست در مود برشی نسبت به مود کششی حدود %58 کاهش داشته است. همچنین، نمونههای چاپشده در جهت ˚90 به دلیل ضعف در اتصال بینلایهای، مقاومت کمتری در برابر رشد ترک نسبت به جهتهای ˚0 و ˚90/˚0 از خود نشان دادند. در نهایت، از میان موارد بررسی شده، جهت ˚90/˚0 به دلیل برقراری تعادل مطلوب میان استحکام کششی بالا و مقاومت مناسب در برابر رشد ترک، بهعنوان جهتگیری بهینه پیشنهاد گردید. | ||
| کلیدواژهها | ||
| ساخت افزایشی؛ پلیلاکتیک اسید؛ خواص مکانیکی؛ جهت چاپ؛ گیره آرکان | ||
| عنوان مقاله [English] | ||
| Investigation of the Effect of Printing Orientation and Loading Direction on the Mechanical Properties and Fracture Behavior of Additively Manufactured Polylactic Acid | ||
| نویسندگان [English] | ||
| Elyas Haddadi1؛ Mohammad Reza Adibeig2؛ Abuzar Eshaghi Oskui3، 4 | ||
| 1Department of Mechanical Engineering, Technical and Vocational University (TVU), Tehran, Iran | ||
| 2Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen, 518055, China | ||
| 3Moganshan Institute ZJUT, Kangqian District, Deqing 313200, China|High-speed Rotating Machinery Laboratory, Zhejiang University, Hangzhou 310027, China | ||
| 4Moganshan Institute ZJUT, Kangqian District, Deqing 313200, China|High-speed Rotating Machinery Laboratory, Zhejiang University, Hangzhou 310027, China | ||
| چکیده [English] | ||
| The mechanical properties and crack growth resistance of polylactic acid (PLA) specimens produced via additive manufacturing were investigated. The primary objective was to evaluate the influence of printing orientation on the mechanical behavior of specimens under different loading conditions. Specimens were fabricated with three printing orientations: 0°, 90°, and 0°/90°, representing longitudinal, transverse, and bidirectional layer arrangements, respectively. The results revealed that changing the printing orientation from 0° to 90° or 0°/90° significantly increased the maximum tensile stress by approximately 39% and the strain at failure by an average of 30%. To assess crack growth resistance, fracture tests were conducted under tensile (mode-I) and shear (mode-II) loading using butterfly-shaped specimens tested with a modified Arcan fixture. Geometric factors corresponding to different loading orientations were extracted using finite element simulations. The results indicated that the critical strain energy release rate under shear loading was approximately 58% lower than under tensile loading. Additionally, specimens printed at a 90° orientation exhibited lower crack growth resistance compared to those at 0° and 0°/90° due to weaker interlayer bonding. Ultimately, the 0°/90° orientation was identified as optimal, offering a favorable balance between high tensile strength and adequate crack growth resistance. | ||
| کلیدواژهها [English] | ||
| Additive Manufacturing, Polylactic Acid, Mechanical Properties, Printing Orientation, Arcan Fixture | ||
| مراجع | ||
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آمار تعداد مشاهده مقاله: 370 تعداد دریافت فایل اصل مقاله: 272 |
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