مجله مهندسی مکانیک

مجله مهندسی مکانیک

مقایسه عددی و تجربی دیدگاه مکانیک آسیب پیشرفته و اصلاح ‌شده گرسون بر روی شکست فولاد با گرید API X70

نوع مقاله : علمی پژوهشی

نویسندگان
1 دانشجوی دکتری، دانشکده مهندسی مکانیک، دانشگاه بیرجند، بیرجند
2 استاد، دانشکده مهندسی مکانیک، دانشگاه بیرجند، بیرجند
چکیده
فولادهای API X70 به ‌طور گسترده در خطوط انتقال گاز ایران استفاده می‌ شوند. این فولادها که به روش ترمومکانیکی کنترل‌ شده تولید می ‌شوند، به‌ دلیل ناهمسانگردی ناشی از فرآیند نورد و خم کاری، رفتار پیچیده ‌ای در محدوده ‌های مختلف تنش از خود نشان می ‌دهند که مدل ‌های کلاسیک قادر به پیش بینی دقیق آن نیستند. در این تحقیق، مدل آسیب گرسونتیورگاردنیدلمن (GTN) با معیار تسلیم ناهمسانگرد هیل ترکیب و در نرم ‌افزار آباکوس به‌ صورت زیروال (VUMAT) پیاده ‌سازی شد. ضرایب ناهمسانگردی ماده در زوایای ۰، ۴۵ و ۹۰ درجه به ‌ترتیب 56/0، 79/0 و 54/0 به‌ دست آمد که نسبت به لوله ‌های بدون درز مقادیر بالاتری دارد. نتایج حاصل از آزمون ‌های کشش و شبیه ‌سازی نشان داد که مدل گرسون پیشرفته نسبت به اصلاح‌ شده، رفتار سخت شوندگی و ناحیه‌ پس از گلویی ‌شدن را با دقت بالاتری پیش‌ بینی می کند. با وجود این، هر دو مدل در بازه‌ خطای کم با داده ‌های تجربی منطبق شدند. در مجموع، یافته‌ ها نشان می‌ دهد که در تحلیل شکست این ماده، استفاده از مدل گرسون پیشرفته با در نظرگیری ناهمسانگردی، پیش‌ بینی واقع ‌بینانه ‌تری از پدیده‌ شکست در ماده دارد.
کلیدواژه‌ها
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دوره 34، شماره 6 - شماره پیاپی 165
بهمن و اسفند 1404
صفحه 24-37

  • تاریخ دریافت 18 مهر 1404
  • تاریخ بازنگری 15 آذر 1404
  • تاریخ پذیرش 21 بهمن 1404