بررسی تجربی و شبیه‌سازی اعوجاج پلی آمید 6 بر اساس رفتار ترمومکانیکی بدست آمده از تست کشش تک محوره

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی مکانیک، دانشگاه صنعتی اصفهان

2 صنعتی اصفهان*مهندسی مکانیک

چکیده

این تحقیق به بررسی رفتار وابسته به زمان پلیآمید 6 و همچنین بررسی مدل کلی ماکسول جهت بیان این رفتار می‌پردازد. به همین منظور، نمونه‌های کشش توسط قالب‌گیری تزریق پلاستیک ساخته و براساس آزمایش رهایی از تنش، مورد آزمایش قرار می‌گیرند. همچنین برای بررسی تاثیر دمای قالب بر خواص وابسته به زمان این پلیمر، دو نمونه با دماهای قالب مختلف ساخته و مورد آزمایش قرار می‌گیرند. در پایان برای اعتبارسنجی مدل کلی ماکسول برای بیان درست رفتار وابسته به زمان پلیمر، یک شبیه‌سازی به روش المان محدود با ارتباط دو نرم‌افزار مولدفلو و آباکوس انجام گردیده که میزان اعوجاج نمونه حاصل از ضرایب استخراج شده از این مدل با میزان اعوجاج نمونه در عمل مقایسه می‌گردد. نتایج نشان می‌دهد که دمای قالب اثر کمی بر خواص وابسته به زمان این پلیمر دارد و همچنین مقایسه میزان اعوجاج نمونه بین شبیه‌سازی و تجربی که اختلاف 13 درصد با هم دارند، نشان می‌دهد که مدل کلی ماکسول به خوبی رفتار وابسته به زمان پلیآمید 6 را بیان می‌کند. لذا با توجه به اعتبارسنجی شبیه‌سازی با نمونه تجربی، این شبیه‌سازی می‌تواند جهت پیش‌بینی میزان اعوجاج نمونه و بررسی اثر پارامترهای فرآیندی مختلف بر رفتار آن قبل از تولید و صرف هزینه، استفاده گردد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental and Simulation Study on the Warpage of Polyamide 6 Based on Thermo Mechanical Behavior of Material Using Uniaxial Tensile Test

نویسندگان [English]

  • Omid Izadi 1
  • Peiman Mosaddegh 2
1 Department of Mechanical Engineering, Isfahan University of Technology
2 Department of Mechanical Engineering, Isfahan University of Technology
چکیده [English]

This research focuses on investigating the time-dependent behavior of polyamide 6 and using the generalized Maxwell model for prediction of this behavior. To achieve this goal, tensile specimens are manufactured via injection molding process and then are tested based on stress relaxation trials. Moreover, two specimens manufactured with different mold temperatures are tested to investigate the effect of the mold temperature on the time-dependent behavior of this kind of polymer. Finally, to evaluate the ability of the generalized Maxwell model to predict the time-dependent behavior of polyamide 6 correctly, a finite element simulation is carried out via a link between the Moldflow and ABAQUS software. In these simulations, the amount of warpage occurring in the specimen obtained from this model is compared with experimental finding. The results show that the mold temperature has a negligible effect on the time-dependent behavior of this polymer and also, there is a good agreement between simulation and experimental results of warpage with a mean error of 13%. Therefore, the generalized Maxwell model is good enough to predict the time-dependent behavior of polyamide 6. On the other hand, this methodology can be used prior to making real parts to prevent the high cost of manufacturing.

کلیدواژه‌ها [English]

  • Thermo-mechanical behavior
  • Viscoelastic
  • Warpage
  • Polyamide 6

مراجع

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نشریه مهندسی مکانیک امیرکبیر
دوره 52، شماره 5
مرداد 1399
صفحه 1127-1138

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