نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار، دانشکده مهندسی هوافضا، دانشگاه سمنان، سمنان، ایران

2 دانشجوی کارشناسی ارشد، دانشکده مهندسی هوافضا، دانشگاه سمنان، سمنان، ایران

چکیده

یکی از موارد مهم درباره رفتار کامپوزیت‌ها در شرایط بارگذاری مختلف، پیدایش و رشد مودهای خرابی متنوعی است که دارای تأثیر بسزایی بر نحوه عملکرد آن‌ها هستند. مود خرابی مربوط به جدایش اتصال بین الیاف و ماتریس را می‌‌توان جزو اولین موارد در پیدایش خرابی در کامپوزیت‌های مختلف دانست که متعاقب آن و یا به‌صورت هم‌زمان، مودهای خرابی دیگری هم‌چون ترک‌های ماتریسی نیز به‌وجود می‌آیند. در مقاله حاضر با استفاده از مدل ناحیه چسبنده و المان محدود تعمیم یافته و با اعمال بارگذاری عرضی بر المان‌های حجمی نماینده در فاز مایکرومکانیک، اثرات پیدایش و رشد خرابی‌هایی هم‌چون جدایش بین الیاف و ماتریس، و ترک‌های ماتریسی مطالعه شده است. بدین منظور، در ابتدا رفتار ناحیه چسبنده بررسی شده و با شبیه‌سازی نتایج مربوط به جدایش الیاف از ماتریس در مقالات گذشته، روش طراحی صحت‌سنجی شده است. سپس اثرات مدل ناحیه چسنده در المان‌های حجمی مختلف مطالعه و نتایج آن‌ها با یکدیگر مقایسه می‌شوند. در ادامه با وارد کردن اثرات مربوط به پیدایش و رشد ترک ماتریسی با استفاده از روش المان محدود تعمیم یافته، اثرات ناشی از خرابی ناحیه چسبنده و ترک‌های ماتریسی به‌صورت هم‌زمان با استفاده از روش المان محدود و نرم‌افزار آباکوس مطالعه می‌شوند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Micromechanical study of fibre- matrix debonding and matrix cracking using cohesive zone model and extended finite element method

نویسندگان [English]

  • amin farrokhabadi 1
  • Mohsen Naghdinasab 2

1 Department of Aerospace Engineering, Semnan University, Semnan, Iran

2 Department of Aerospace Engineering, Semnan University, Semnan, Iran

چکیده [English]

One of the most important issues about the composites behavior in different loading conditions is the initiation and propagation of various damage modes that have significant effects on the application of these materials. Fiber/matrix debonding is one of the first damage modes that appears in different composites and causes the formation of other damage modes like matrix cracking. In the present study, by using the cohesive zone model (CZM) as well as an extended finite element method (XFEM) and by applying a transverse loading on different representative volume elements (RVE’s) in micromechanical scale, the effects of initiation and propagation of different damage modes like fiber/matrix debonding and matrix cracking will be studied. To this aim, the authors start by studying the behavior of cohesive zone model and validating the applied method by simulating the previous researchs. Then, the effects of cohesive zone on different volume elements will be studied and the results will compare with each other. Finally by entering the effects of matrix cracking initiation and propagation using the extended finite element method, effects of cohesive zone damage and matrix cracking will be studied simultaneously based on finite element method and using Abaqus software

کلیدواژه‌ها [English]

  • Micromechanics
  • Representative volume element
  • Cohesive zone
  • Matrix Cracking
  • Extended Finite Element Method

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