فصلنامه علمی کارافن

فصلنامه علمی کارافن

مدلسازی ساختاری مواد همسانگرد جانبی با رویکرد کاربرد مدل در بررسی رفتار مکانیکی تیوب‌های استوانه ای جدار ضخیم

نوع مقاله : مقاله پژوهشی (نظری)

نویسندگان
1 دانشجوی کارشناسی ارشد، بخش مهندسی مکانیک، دانشکده فنی و مهندسی، دانشگاه شهید باهنر کرمان، کرمان، ایران.
2 دانشیار، بخش مهندسی مکانیک، دانشکده فنی و مهندسی، دانشگاه شهید باهنر کرمان، کرمان، ایران.
3 کارشناسی ارشد، گروه مهندسی مکانیک، دانشگاه فنی و حرفه‌ای، تهران، ایران.
چکیده
دسته‌های مختلفی از مواد مثل الاستومرها، پلیمرها، فوم‌ها و بافت‌های بیولوژیکی وجود دارند که می‌توانند تغییرشکل‌های بزرگ الاستیک تحت تنش‌های کوچک (در مقایسه با مواد جامدی مثل فلزات) از خود نشان دهند. با نسبت دادن یک تابع چگالی انرژی کرنشی برای این دسته از مواد به توصیف رفتار غیرخطی آن‌ها پرداخته می‌شود. در مطالعه حاضر، یک تابع چگالی انرژی کرنشی برای مواد هایپرالاستیک همسانگرد جانبی ارائه شده و مدل پیشنهادی با داده‌های تجربی با استفاده از روش مجموع مربعات باقیمانده کالیبره شده است. انحرافات پیش‌بینی شده‌ (RSS) مدل پیشنهادی از داده‌های تجربی برای لایه‌های حلقه فیبروسی، رباط‌ها و تاندون زانوی انسان به ترتیب حداکثر از اردر 5-10 و 7-10 مگاپاسکال، می‌باشد. تابع پیشنهادی تابعی از دو ناورداهای همسانگرد جانبی است که می‌تواند دقیق‌تر از توابع ارائه شده توسط کیو و پنس، میرودیو و آگدن و گوا و همکارانش که تابعی از یک ناوردای همسانگرد جانبیست، ‌باشد. با استفاده از تابع چگالی پیشنهادی، یک حل تحلیلی بسته بدون وجود ترم‌های انتگرالی مبهم برای توزیع تنش در دیواره تیوب تحت‌ فشار داخلی جدار ضخیم ساخته ‌شده از مواد هایپرالاستیک همسانگرد جانبی که رفتاری شبیه به رگ انسان دارد، ارائه شده است. تحلیل تنش و بررسی تغییر شکل برای این نوع سازه‌، شبیه به رگ، با دو انتهای باز و بسته با حضور نیروهای محوری صورت گرفته است.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Constitutive Modeling of Transversely Isotropic Materials to Investigate the Mechanical Behavior of Thick-walled Cylindrical Tubes

نویسندگان English

Mehdi Abrishamdari 1
Hossein Darijani 2
Fatemeh Darijani 3
1 MSc. Student, Mechanical Engineering Department, Shahid Bahonar University of Kerman, Kerman, Iran.
2 Associate Professor, Mechanical Engineering Department, Shahid Bahonar University of Kerman, Kerman, Iran.
3 MSc., Department of Mechanical Engineering, Technical and Vocational University (TVU), Tehran, Iran.
چکیده English

There are different categories of materials like elastomers, polymers, hydrogel foams, and biological tissues that respond with large deformations (in comparison with solid metals) while under small stresses. By using a strain energy density function, it is possible to investigate their non-linear mechanical behavior. In the current study a strain energy density function for transversely hyperelastic material is proposed and its coefficients are approximated (using least square error) by incorporating experimental results into the model. Expected deviations between the proposed model and the experimental results for the fibrous layer of articular capsule, ligaments, and the human knee tendos are bounded by 1e-5 MPa and 1e-7 Mpa respectively. The proposed strain energy density function is a function of two invariants with more accuracy than the proposed one by Qiu and Pence, Merodio and Ogden and Guo et al. which uses a strain energy density function with only one invariant. Using the strain energy density function, a closed analytical form independent of integrals terms for expressing the stress within a thick-walled cylindrical tube for transversely isotropic hyperelastic materials, that has similar mechanical behavior to that of a human artery, is derived. The analysis for the stress, deformations is done considering artery like structures with both ends open and closed while under axial loads.

کلیدواژه‌ها English

Strain Energy Density
Large Deformations
Mechanical Behavior
Thick-walled Tubes
Hyperelastic Materials
Stress Analysis
Transversely Isotropic
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دوره 20، شماره 1 - شماره پیاپی 61
فنی و مهندسی
بهار 1402
صفحه 217-242

  • تاریخ دریافت 29 آبان 1401
  • تاریخ بازنگری 28 اسفند 1401
  • تاریخ پذیرش 16 اردیبهشت 1402