مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

تحلیل و مدل سازی آسیب و رشد ترک در قطعه کار کامپوزیتی تحت فرآیند ماشینکاری با استفاده از تئوری پری داینامیک مبتنی بر پیوند

نوع مقاله : پژوهشی اصیل

نویسندگان
رضا رشمه کریم
محمد جعفری
مهدی حیدری
دانشگاه صنعتی شاهرود
10.22034/mme.23.10.209
چکیده
تحلیل و مدل­سازی نحوه رشد ترک و آسیب در اجسام و سازه ها یکی از موارد مهم برای طراحی روش­های جلوگیری رشد ترک و یا توقف آن جهت جلوگیری از وقوع شکست ناگهانی و در نتیجه افزایش عمر سازه­ها می­باشد. تا کنون تحقیقات گسترده­ای در زمینه مدل­سازی شکست، رشد ترک و آسیب در اجسام و سازه­ها، توسط پژوهشگران صورت گرفته است. با وجود این پژوهش­ها هنوز مشکلات زیادی در زمینه مدل­سازی رشد ترک و آسیب در اجسامی که دارای نقاط منفرد و ناپیوستگی­ها می­باشند، وجود دارد. در سال­های اخیر نظریه جدیدی تحت عنوان تئوری پری‌داینامیک برای مدل سازی و تحلیل چنین مسائلی ارائه شده است. چارچوب فرمول­بندی تئوری پری­داینامیک بر اساس معادلات انتگرالی می باشد. همچنین نقاط منفرد، ناپیوستگی­ها و آسیب در جسم و مدل­سازی آن­ها به عنوان نوعی دیگر از تغییر شکل و جزیی از معادلات ساختاری این تئوری می باشند. در نتیجه می­توان از تئوری پری­داینامیک بطور مستقیم و بدون نیاز به روابط تکمیلی جهت مدل­سازی رشد ترک در مسائلی که شامل نقاط منفرد و ناپیوستگی ها هستند، استفاده کرد. در این پژوهش به ارزیابی تئوری پری­داینامیک مبتنی بر پیوند در تحلیل و مدل­سازی آسیب در قطعه­کار کامپوزیتی پلیمری تک­لایه تقویت شده با الیاف تک­جهته کربن پرداخته شده­است و نتایج حاصل از این پژوهش با نتایج منابع در دسترس مورد مقایسه قرار گرفته شده است. با توجه به نتایج حاصل از این پژوهش می­توان بیان کرد که تئوری پری­داینامیک بخوبی و بدون تغییر درمعیار و بدون نیاز به روابط تکمیلی قادر به تحلیل و مدل­سازی رشد ترک، آسیب و شکست در قطعه­کار کامپوزیتی پلیمری تقویت شده با الیاف کربن می­باشد. همچنین می­توان بیان کرد که جهت الیاف در قطعه­کار کامپوزیتی موردنظر تاثیر بسزایی بر آسیب و رشد ترک ایجاد شده در آن و نیروی وارد بر آن از طرف ابزار طی فرآیند ماشین­کاری دارد.
کلیدواژه‌ها
آسیب سطحی
ترک
کامپوزیت پلیمری تقویت شده با الیاف کربن
تئوری پری داینامیک

موضوعات

عنوان مقاله English

Analysis and Modeling of Damage and Crack Growth in Composite Workpieces under Machining Process using the Bond-Based Peridynamic Theory

نویسندگان English

Reza Rashmehkarim
Mohammad Jafari
Mahdi Heidari
چکیده English

Analyzing and modeling damage and crack growth in bodies and structures is one of the important issues in designing methods to prevent crack growth or stop it in order to avoid sudden fracture and increase the lifetime of structures. Extensive research has been performed in the field of modeling fracture, crack growth, and damage in bodies and structures. However, there are still many problems in modeling crack growth and damage in bodies with points of singularity and discontinuities. In recent years, a new theory called peridynamic has been proposed to model and analyze such problems. The formulation framework of peridynamic theory is based on integral equations. In addition, points of singularity and discontinuities and damage in the body and modeling them are another type of deformation and part of the structural equations of this theory. As a result, the peridynamic theory is used directly, without the need for additional relations to model crack growth in problems involving points of singularity and discontinuities. In this paper, a bond-based peridynamic modeling for unidirectional carbon fiber reinforced polymer material(UDCFRP) orthogonal cutting process is proposed, and the corresponding composite material bond failure criterion is also investigated for better revealing the machining mechanism of UD-CFRP machining. From comparing between simulation and experimental results, it can be indicated that the peridynamic modeling is capable for predicting the chip formation and surface crack and damages in UD-CFRP machining.

کلیدواژه‌ها English

Surface damage
Crack
CFRP Composite
Peridynamic Theory
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مهندسی مکانیک مدرس
دوره 23، شماره 10
مهر 1402
صفحه 209-221