نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد ، مهندسی مکانیک ، دانشگاه گیلان ، رشت

2 استاد ، مهندسی مکانیک ، دانشگاه گیلان ، رشت.

3 دانشیار، مهندسی مکانیک، دانشگاه گیلان، رشت.

4 دکتری تخصصی، مهندسی مکانیک ، دانشگا ه کیل ، کیل

10.22068/jstc.2020.133844.1675

چکیده

بیشتر مواد طبیعی کامپوزیت‌هایی هستند که می‌توانند دامنه گسترده‌ای از خواص مواد مانند مدول الاستیک را نشان دهند.کیوتیکل حشرات یکی از این مواد طبیعی است. نوع گرادیان کیوتیکل در قسمت‌های مختلف بدن حشرات به طرز چشمگیری متفاوت است. به دلیل ابعاد کوچک نمونه‌های کیوتیکل، انجام آزمایش‌های تجربی، بسیار چالش برانگیز، پر هزینه و وقت گیر است. شناخت عملکرد ساختار‌های کیوتیکلی و خصوصیات درجه‌بندی شده‌ی آن‌ها می‌تواند به طراحی و توسعه‌ی مواد مهندسی با خواص پیشرفته کمک کند. در این مقاله‌ از روش اجزای محدود برای بررسی عملکرد کیوتیکل موجود در پوسته بال سنجاقک استفاده شده‌است. نخست توزیع مواد روی پوسته‌ی بال با استفاده از تصاویر بدست‌آمده توسط میکروسکوپ اسکن لیزری روبشی(CLSM) بررسی می‌شود. سپس، برای ارزیابی مقادیر تنش و کرنش تحت جابه‌جایی، روابط مختلف سفتی برروی یک مدل هندسی از تیر یکسر گیردار، که نمایانگر پوسته است، اعمال میشود. مقایسه‌ی نتایج بدست‌آمده از تجزیه و تحلیل روابط مختلف سفتی نشان داد رابطه‌ی سهموی درجه دو به عنوان توزیع مناسب‌تر برای سفتی، از لحاظ دارا بودن کمترین تنش و کرنش در این ساختار، نسبت به سایر روابط سفتی معرفی می‌گردد. این پژوهش بستری برای تحقیقات بیشتر میان رشته‌ای در این زمینه است.

کلیدواژه‌ها

عنوان مقاله [English]

Numerical investigation of the material gradient using different stiffness functions by consideration of the graded stiffness of the dragonfly wing membrane

نویسندگان [English]

  • Afsaneh Vahdani 1
  • Abolfazl Darvizeh 2
  • Majid Alitavoli 3
  • Hamed Rajabi 4

1 Faculty of Mechanical Engineering University of Guilan, Rasht, Iran.

2 Faculty of Mechanical Engineering, University of Guilan, Rasht, Iran.

3 Faculty of Mechanical Engineering, University of Guilan, Rasht, Iran.

4 Institute of Zoology, Functional Morphology and Biomechanics, Kiel University, Kiel, Germany .

چکیده [English]

Most natural materials are composites that can exhibit a wide range of material properties, such as the elastic modulus. Insect cuticle is one of these natural materials. The material gradient of the cuticle drastically varies in different insect body parts. Considering the small size of cuticular samples, conducting experimental tests is very challenging, expensive, and time-consuming. Understanding how cuticular structures work and their graded properties can help to design and develop engineering materials with enhanced properties. In this paper, the finite element (FE) method is used to investigate the function of the cuticle in the membrane of dragonfly wings. In this regard, first, the distribution of materials on the wing membrane is investigated using images obtained by confocal laser scanning microscope (CLSM). Then, in order to estimate the stress and strain values subjected to displacement, multiple stiffness functions are applied for a geometric model of a cantilever beam, which represents the membrane. The results show that the presence of a graded stiffness has a significant effect on the mechanical behavior of the cantilever beam. A comparison of the results obtained from the analysis of different stiffness functions showed that The quadratic function is introduced as a more suitable distribution for stiffness, in terms of having the least stress and strain in this structure, compared to other stiffness functions. This study can provide a proper and applied platform for further interdisciplinary research in this area.

کلیدواژه‌ها [English]

  • Graded materials
  • finite element method
  • biological structures
  • confocal laser scanning microscopy
  • biomechanics
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