نوع مقاله: مقاله پژوهشی

نویسندگان

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

2 مربی، دانشکده مهندسی مکانیک، موسسه آموزش عالی احرار، رشت، ایران

3 استاد، دانشکده مهندسی مکانیک، دانشگاه آزاد اسلامی واحد انزلی، بندرانزلی، ایران

4 دانشجوی دکترا، دانشکده مهندسی مکانیک، دانشگاه گیلان، رشت، ایران

5 دانشیار، دانشکده مهندسی مکانیک، دانشگاه گیلان، رشت ، ایران

6 استادیار، دانشکده مهندسی مکانیک، دانشگاه گیلان، رشت، ایران

چکیده

در این مقاله، روشی جدید برای مدل‌سازی المان محدود ساختار‌های صفحه‌ای متشکل از چند ماده متفاوت با استفاده از تنها یک تصویر ورودی اریه شده است. این روش که در یک برنامه متلب تعبیه شده مبتنی بر پردازش تصویر دیجیتال می‌باشد. پس از انتخاب یک عکس دیجیتال توسط کاربر، برنامه به‌طور اتوماتیک تصویر ورودی را به فرمت باینری تبدیل می‌کند. سپس، سطح داخل ساختار مدنظر در عکس ورودی و مرز آن بر اساس اختلاف رنگ پیکسل‌های تشکیل دهنده شناسایی می‌شوند. مرز ساختار و سطح داخلی تشخیص داده شده به‌طور جداگانه و با اتصال پیکسل‌های آن‌ها به یکدیگر المان‌بندی می‌شوند. خروجی برنامه یک فایل در فرمت آی‌ان‌پی است که شامل مختصات نقاط مدل المان محدود، نحوه اتصال آن‌ها و همچنین ماده تشکیل دهنده هر مقطع می‌باشد که در طی فرآیند مدل‌سازی توسط کاربر تعیین شده است. نتایج حاصل بیانگر دقت بسیار بالای روش در مدل‌سازی ساختارهای صفحه‌ای کامپوزیتی با شکل هندسی پیچیده در مدت زمان بسیار کوتاه است. همچنین، نتایج به‌دست آمده از تحلیل عددی مدل خروجی دارای مطابقت کمی و کیفی مطلوب با نتایج تجربی ارایه شده پیشین می‌باشد. روش پیشنهاد ‌شده در این مقاله زمینه مستحکمی را برای مدل‌سازی‌های واقع‌گرایانه آینده از ساختارهای صفحه‌ای کامپوزیتی فراهم می‌نماید.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Simple finite element modeling of planar composite structures using digital image processing technique in Matlab

نویسندگان [English]

  • Shahab Eshghi 1
  • Hamed Rajabi 2
  • Abolfazl Darvizeh 3
  • Vahid Nooraeefar 4
  • Majid Alitavoli 5
  • Hashem Babaei 6

1 Department of Mechanical Engineering, University of Guilan, Rasht, Iran

2 Department of Mechanical Engineering, Ahrar Institute of Technology and Higher Education, Rasht, Iran

3 Department of Mechanical Engineering, Islamic Azad University, Anzali Branch, Bandar Anzali, Iran

4 Department of Mechanical Engineering, University of Guilan, Rasht, Iran

5 Department of Mechanical Engineering, University of Guilan, Rasht, Iran

6 Department of Mechanical Engineering, University of Guilan, Rasht, Iran

چکیده [English]

In this article, a new method for finite element modeling of planar multi-material structures, using only an input image, has been presented. This method which is implemented in a Matlab program is based on digital image processing technique. After importing a digital image by the user, the program automatically converts it into a binary format. The inner part and the boundary of the desired structure in the input image are recognized based on the difference between the colors of their pixels. These two regions are meshed separately by connecting their pixels to each other. The output of the program is a file in INP format which includes the coordinates of the nodes of the finite element model, their connections and the material of each part which has been defined by the user during the modeling process. The obtained results indicate the high accuracy of the method in the modeling of planar composite structures with complicated geometries in a very short time. Further, the results from the numerical analysis of the output model are in a good qualitative and quantitative agreement with the previous experimental data. The presented method in this article provides a strong background for future realistic modeling of planar composite structures.
 

کلیدواژه‌ها [English]

  • Composite
  • Modeling
  • Finite element
  • image processing
  • multi-material structures

 

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