بررسی رفتار هیدروژل‌های حساس به دما با در نظر گرفتن خواص تابعی هدفمند

نوع مقاله : مقاله پژوهشی

نویسندگان

1 مهندسی مکانیک-طراحی کاربردی، دانشگاه تهران، تهران، ایران

2 دانشگاه تهران-مهندسی مکانیک

چکیده

هیدروژل ها  شبکه ى پلیمرى ٣ بعدى هستند که به اعمال  تحریک هاى خارجی به شدت پاسخ داده و متورم می شوند. جهت مطالعه رفتار مکانیکی این مواد حین تغییردما، یک تابع انرژى کرنشی متشکل از دو بخش انرژى کشیدگی شبکه و انرژى ترکیب درنظر گرفته شده است. با توجه به تغییر مشخصات  هیدروژل هاى تابعی-هدفمند حساس به دما درراستاى ضخامت، حل  نیمه تحلیلی براى خمش این مواد درشرایط کرنش- صفحه اى ارائه گردیده است. جهت صحت سنجی روش نیمه تحلیلی ارائه شده، از روش اجزاء محدود در  نرم افزار آباکوس با نوشتن زیربرنامه یوهایپر براى مدل ساختارى این مواد استفاده شده است. پس از  صحت سنجی کد یوهایپر در مسئله تورم آزاد ، چند مسئله با شرایط مختلف  بوسیله ى این دو روش مورد مقایسه قرار گرفتند؛ که مطابقت نتایج شعاع، تنش شعاعی و تنش مماسی حاصل از خمش تیر در این دو روش، دقت بالاى روش نیمه تحلیلی ارائه شده را نشان  می دهند. درنهایت با تغییر دما در بازه ٠٢٣ تا ٨٨٢ کلوین، میزان تغییرات دو فاکتور میزان زاویه خمیدگی و انحنا، که اهمیت بالایی در ساخت سنسورها و عملگرها دارند، را مورد مطالعه قرار  داده ایم. پیوستگی  تنش هاى شعاعی و مماسی در  هیدروژل هاى داراى خواص تابعی هدفمند، نسبت به ساختارهاى  چندلایه اى، منجر به کاربردهاى گسترده  این مواد  می شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Mechanical Behavior of Temperature-Sensitive Hydrogel Considering Functionally Graded Characteristics

نویسندگان [English]

  • Mohammad Shojaeifard 1
  • Mostafa Baghani 2
1 School of Mechanical Engineering, College of Engineering, University of Tehran, Iran
2 دانشگاه تهران-مهندسی مکانیک
چکیده [English]

Hydrogels are 3 dimensional polymeric networks containing cross-linked chains which respond severely to the exterior stimuli and absorb a great amount of solution and swell. The functionally graded temperature-sensitive hydrogel is one of the most applicable materials to be used in the industry. Thus, to study the mechanical behavior of these materials, an energy density function is introduced which includes network stretch energy and mixing part. Considering the properties variation along the thickness direction, bending of functionally graded temperature-sensitive hydrogels is solved analytically under plane strain assumption. Verifying the presented analytical procedure, the results of this approach is compared with the outcomes of finite element method. To solve diverse problems by finite element method, UHYPER subroutine has been verified in the free-swelling problem. Next, the radius and stresses are studied by both methods for functionally graded temperature-sensitive hydrogels. Finally, according to the importance of factors such as semi-angle and bending curvature in industrial designs, these factors are investigated by changing the temperature in a range of 320 to 288 Kelvin. The continuity of the radial and tangential stresses field is the other reason for utilizing functionally graded hydrogels, while the multi-layer hydrogels do not have continuous stress fields.

کلیدواژه‌ها [English]

  • Temperature sensitive hydrogels
  • Functionally graded materials
  • Semi-analytical solution
  • Finite element modeling

مراجع

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نشریه مهندسی مکانیک امیرکبیر
دوره 52، شماره 12
اسفند 1399
صفحه 3583-3594

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