مقایسه استحکام کششی نمونه‌های چاپ سه‌بعدی شده به روش مدل‌سازی لایه نشانی ذوبی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، مهندسی مکانیک، دانشگاه صنعتی اراک، اراک، ایران

2 دانش‌آموخته کارشناسی، مهندسی مکانیک، دانشگاه صنعتی اراک، اراک، ایران

چکیده

فرآیندهای ساخت افزایشی دسته‌­ای از فرآیندهای تولید هستند که برای ساخت قطعات خاص در کمترین زمان ممکن مورد استفاده قرار می‌­گیرند. برخلاف روش ماشینکاری که با براده­‌برداری و به صورت کاهشی عملیات ساخت انجام می‌­شود، در روش ساخت افزایشی با اضافه نمودن یک لایه جدید به لایه‌های قدیمی چاپ شده، قطعه نهایی ساخته می‌­شود. در این مقاله به بررسی استحکام کششی نمونه‌­های تولید شده از جنس ABS پرداخته می‌­شود. سه پارامتر مورد بررسی اثر اندازه نمونه، اثر درصد تراکم و اثر الگوی چاپ بر رفتار تنش-کرنش قطعات می‌­باشد. سه نمونه با اندازه متفاوت، پنج نمونه با درصدهای مختلف تراکم و دو نمونه با الگوی چاپ متفاوت تولید شده‌­اند و پس از انجام آزمون کشش، رفتار منحنی تنش-کرنش قطعات با یکدیگر مقایسه شده‌­اند. نتایج آزمون کشش نشان داد که با افزایش اندازه نمونه، استحکام کششی قطعات کاهش می­‌یابد. همچنین با کاهش درصد تراکم، نیروی تحمل شده توسط نمونه و درصد ازدیاد طول قبل از شکست کاهش می­‌یابد و تفاوت قابل توجهی میان نمونه با تراکم صد درصد و سایر نمونه‌­ها وجود دارد. با مقایسه نسبت نیروی ماکزیمم بر جرم هر یک از نمونه‌­ها مشاهده می­‌شود که این نسبت برای نمونه­‌های متخلخل نزدیک به یکدیگر بوده، ولی این نسبت برای نمونه توپر در مقایسه با نمونه­‌های متخلخل 25 درصد بیشتر می­‌باشد. استحکام نمونه­‌های چاپ شده به روش نرمال نسبت به نمونه تولید شده با پروفایل­‌های هم‌­مرکز 9/13 درصد بیشتر است. همچنین کرنش شکست نمونه‌­های چاپ شده به روش پروفایل‌­های هم‌مرکز 48 درصد نسبت به کرنش شکست نمونه نرمال کاهش یافته  است.

کلیدواژه‌ها

عنوان مقاله [English]

Comparison of Tensile Strength for 3D Printed Parts Fabricated by Fused Filament Fabrication (FFF)

نویسندگان [English]

  • Jalal Joudaki 1
  • Seyed Amirhosein Naghavi Alhoseini 2
1 Department of Mechanical Engineering, Arak University of Technology, Arak, Iran
2 Department of Mechanical Engineering, Arak University of Technology, Arak, Iran
چکیده [English]

Additive manufacturing is a new type of manufacturing process which is used for the fabrication of special parts in a minimum possible time. Unlike the machining processes in which the part is prepared by material removal, the parts are fabricated in additive manufacturing by adding a new layer to old printed layers. In this article, the tensile strength of printed specimens from ABS by Fused Filament Fabrication (FFF) will be evaluated. Size, in-fill density, and the print pattern are three process parameters that will be investigated. Three different size samples, five different in-fill density samples, and two samples with different patterns are printed and the stress-strain behavior of prepared samples was compared. The tensile test results show that the tensile strength of samples decreases by increasing the sample size. Also, by decreasing the in-fill density, the tensile load of samples and elongation decreases, and a considerable difference between the 100% in-fill density and other samples are observed. By comparing the ratio of maximum force to the mass of samples it was observed that this ratio is almost constant for non-solid samples but this ratio is 25% higher for the solid (100% in-fill density) sample compared to the non-solid samples.  The strength of the samples printed by the normal pattern is 13.9 % higher than the sample produced with concentric profiles. The failure strain of the sample produced with concentric profiles reduces by about 48% compared to samples printed by the normal pattern.

کلیدواژه‌ها [English]

  • 3D printing
  • Fused Filament Fabrication
  • Tensile Strength
  • Size Effect
  • In-fill Density

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مهندسی ساخت و تولید ایران
دوره 9، شماره 5
مرداد 1401
صفحه 40-48

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