مدل‌سازی سه بعدی اثر خستگی در کامپوزیت‌های پلیمری فلزی یونی

نوع مقاله : علمی و پژوهشی

نویسندگان

گروه برق، دانشکده مهندسی، دانشگاه فردوسی مشهد.

چکیده

کامپوزیت های پلیمری فلزی-‌‌یونی (IPMC) مواد هوشمندی هستند که ساختارشان شامل دو بخش فلزی و الاستومری است. از نظر کاربردی در دسته پلیمرهای الکترواکتیو قرار می‌گیرند که گزینه مناسبی برای استفاده به‌عنوان سنسور و عملگرهای نرم با ولتاژ تحریک اندک هستند. در کاربرد بعنوان عملگر، خمش IPMC علاوه بر ولتاژ تحریک، متأثر از عوامل ذاتی و محیطی است. پیش‌‌بینی «اثر پس‌‌آرامش» چالشی جدی در بکارگیری عملی IPMC است. اصطلاح اثر پس‌‌آرامش برای کاهش تدریجی خمش IPMC و بازگشت آن به طرف کاتد، تحت تحریک با ولتاژ ثابت بکار می‌رود. در این پژوهش برای اولین بار، اثر پس‌‌آرامش در رفتار خمشی IPMC در فضای سه‌‌بعدی با نرم‌‌افزار Comsol مدل‌سازی شده است. مقایسه نتایج با داده‌های آزمایش عملی، حاکی از دقت 93 درصدی مدل‌‌سازی در پیش‌‌بینی جابجایی است که سایر اطلاعات مهم عملکردی مانند تغییرات غلظت و توزیع تنش در ماده را نیز تأیید می‌کند. استفاده از این مدل برای پیش بینی رفتار IPMC، در مقایسه با انجام آزمایش های عملی، ازلحاظ وقت و هزینه بسیار مقرون‌ به‌ صرفه خواهد بود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

3D Modeling of Fatigue Effect in Ionic Metal Polymer Composites

نویسندگان [English]

  • Arezoo Kharaji
  • Nadia Naghavi
  • Hojat Zamyad
Department of Electrical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
چکیده [English]

Ionic Polymer Metal Composites (IPMC) are smart materials that consist of two parts, metal, and elastomer. Functionally, IPMCs are a group of electroactive polymers that, due to their special structure, are a suitable option for use as sensors and soft actuators with low excitation voltage. When used as an actuator, in addition to the excitation voltage, IPMC bending is affected by intrinsic and environmental factors. One of the serious challenges in the practical application of IPMC is the prediction of the "Back-Relaxation effect". The term back-relaxation effect is a term used for the gradual reduction of IPMC bending and return to the cathode side under constant voltage excitation. In this research, the effect of back-relaxation on the bending behavior of IPMC has been modeled in three dimensions with Comsol software, for the first time. The comparison of the results with the practical test data indicates high accuracy of 93% of the modeling in predicting displacement, which also confirms other important performance information such as concentration changes and stress distribution in the material. Using this model to predict IPMC behavior will be very cost-effective in terms of time and cost compared to practical tests.

کلیدواژه‌ها [English]

  • Smart Material
  • Ionic Polymer Metal Composite (IPMC)
  • Back-Relaxation effect
  • Comsol
  • Multiphysics Modeling

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