تحلیل تجربی و شبیه‌سازی تاثیر پارامترهای هندسی چاپ سه‌بعدی بر روی بازیابی ‌شکلی پیچشی پلیمر پلی لاکتیک اسید

نوع مقاله : مکانیک جامدات

نویسندگان

1 نویسنده مسئول: دانشجوی دکتری، دانشکده مهندسی مکانیک، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران، ایران

2 استاد، دانشکده مهندسی مکانیک، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران، ایران

3 استادیار، دانشکده مهندسی و علم مواد، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران، ایران

چکیده

ساخت افزایشی یکی از فرآیندهای ساخت پیشرفته است که امروزه به دلیل ساخت قطعات با ساختارهای پیچیده، سرعت و هزینه پایین تولید، در حال توسعه و گسترش است. چاپ سه بعدی قطعات حافظه‌دارشکلی در قالب چاپ چهاربعدی، پدیده‌ای نوظهور در این عرصه است که به عنوان آینده ساخت افزایشی از آن یاد می‌شود. در این پژوهش، اثر پارامترهای فرآیند لایه نشانی ذوبی شامل ضخامت لایه، سرعت چاپ و قطر نازل بر میزان بازیابی‌شکلی پیچشی قطعه چاپ شده بر پایه ماده پلی لاکتیک اسید، بررسی شد. برای کاهش هزینه و زمان همچنین بالا بردن اعتبار و دقت، از روش طرح مرکب مرکزی یکی از زیرمجموعه‌های روش سطح پاسخ استفاده گردید. تعداد 17 آزمایش انجام شد و مدلی برای تعیین اثر پارامترهای هندسی چاپ سه بعدی بر میزان تغییرشکل بازیابی بدست آمد. 2R و Adj R2 مدل به ترتیب بالاتر از 99/0 و 98/0بدست آمد که نشان‌دهنده دقت بالای مدل و تشابه داده‌های آزمایشگاهی و مدل تجربی است. این مدل نشان داد که ضخامت لایه‌ها، قطر نازل و سرعت چاپ به ترتیب اثرگذاری بیشتری در میزان بازیابی شکلی پیچشی دارند. برای بررسی رفتار بازیابی شکلی، این فرآیند شبیه‌سازی شد و رابطه بین زاویه پیچش بازیابی شده و پیش‌تنش اعمالی در فرآیند چاپ بدست آمد. برای صحت‌سنجی مدل، اثر پارامترهای چاپ سه بعدی بر میزان بازیابی شکلی و رابطه پیش‌تنش با میزان بازیابی شکلی، زاویه پیچش دلخواه 200 درجه در نظر گرفته شد که پس از آزمایش تجربی خطای مدل 2 درصد محاسبه شده و نتایج شبیه‌سازی منطبق با رفتارحافظه شکلی قطعه بدست‌آمد.

کلیدواژه‌ها


عنوان مقاله [English]

Experimental and Numerical Study on the Effect of 3D Printing Geometrical Parameters on the Torsional Shape Recovery Behavior of Polylactic Acid

نویسندگان [English]

  • Mohammadhadi Hosseinzadeh 1
  • Majid Ghoreishi 2
  • Keivan Narooei 3
1 Corresponding author: Ph.D. Student, Department of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran
2 Professor, Department of Mechanical Engineering K. N. Toosi University of Technology, Tehran, Iran
3 Assistant Professor, Department of Materials Science and Engineering, K. N. Toosi University of Technology, Tehran, Iran
چکیده [English]

Additive manufacturing is one of the advanced manufacturing processes that is being developed nowadays due to the capability of manufacturing parts with complex structures, speed, and low production cost. 3D printing of shaped memory parts in the form of 4D printing is an emerging phenomenon, which is referred to as the future of additive manufacturing. In this study, the effect of three-dimensional printing fusion layer parameters including layer thickness, print speed, and nozzle diameter on the rate of shape recovery of Polylactic acid was investigated. To reduce the cost and time as well as to increase the validity and accuracy, the Central Composite Design method, one of the subsets of the Response Surface Methodology, was used. Seventeen experiments were performed and a model was obtained to determine the effect of 3D printing geometrical parameters on shape recovery. R 2 and Adj R2 of the model were obtained above of 0.99 and 0.98, respectively, which indicate the high accuracy of the model and the similarity of laboratory data and experimental model. This model showed that the layer thickness, nozzle diameter, and printing speed have a greater effect on the amount of torsional shape recovery, respectively. This process was simulated to investigate the shape recovery behavior. As a result, the relationship between the recovered shape torsion angle and the applied pre-stress was obtained. To validate the model, the effect of 3D printing parameters on the shape recovery, and the relationship between the pre-stress and the rate of shape recovery,...

کلیدواژه‌ها [English]

  • 3D Printing
  • Fused Deposition Modeling
  • Shape Memory Polymer
  • Central Composite Design
  • Numerical Simulation

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دوره 18، شماره 2 - شماره پیاپی 68
شماره پیاپی 68، فصلنامه تابستان
مرداد 1401
صفحه 169-181
  • تاریخ دریافت: 29 آذر 1400
  • تاریخ بازنگری: 11 دی 1400
  • تاریخ پذیرش: 20 دی 1400
  • تاریخ انتشار: 01 مرداد 1401