مجله مهندسی مکانیک

مجله مهندسی مکانیک

مروری بر روش‌ های تخمین عمر خزشی در قطعات دما بالا

نوع مقاله : مقاله مروری

نویسندگان
1 کارشناسی ارشد، بخش مهندسی مواد، دانشگاه تربیت مدرس، تهران
2 دانشیار، بخش مهندسی مواد، دانشگاه تربیت مدرس، تهران
چکیده
خزش پدیده ای وابسته به زمان است که در دماهای بالا رخ می‌ دهد و باعث تغییر شکل دائمی ماده تحت تنش ثابت می شود. به دلیل اهمیت این پدیده در قطعات دما بالا، تخمین عمر این قطعات همواره چالش ‌برانگیز بوده است. در ابتدا، تخمین عمر با روش‌ های بدون آسیب انجام می ‌شد که در آن اثر آسیب‌ هایی مانند رشد ترک و عیوب ریزساختاری نادیده گرفته می‌ شد. با پیشرفت علم و افزایش حساسیت عملکردی قطعات، رویکردهای تخمین عمر با آسیب، مانند مکانیک آسیب و مکانیک شکست، معرفی شدند. در مکانیک شکست، فرض بر وجود ترک است، اما در مکانیک آسیب، آسیب ناشی از جوانه‌ زایی عیوب ریزساختاری در نظر گرفته می ‌شود. به همین دلیل، پارامتر آسیب در معادلات مکانیک آسیب اهمیت ویژه ‌ا­­ی دارد. در معادلات جدیدتر مکانیک آسیب، امکان تفکیک عیوب ریزساختاری فراهم شده است. محدودیت‌ های موجود در هر روش باعث شده است که محققان به سمت معادلات ترکیبی برای رفع این محدودیت ‌ها گرایش پیدا کنند. این معادلات بیشتر بر پایه مکانیک آسیب هستند و اهمیت این رویکرد را در تخمین عمر نشان می ‌دهند. با وجود پیشرفت ‌ها، مطالعات مرتبط با عدم قطعیت و عملکرد قطعات در شرایط واقعی که معمولاً چندمحوره هستند، همچنان محدود است. انتظار می ‌رود در آینده به این موضوعات بیشتر توجه شود.
کلیدواژه‌ها

موضوعات


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دوره 34، شماره 1 - شماره پیاپی 160
فروردین و اردیبهشت 1404
صفحه 63-87

  • تاریخ دریافت 25 تیر 1403
  • تاریخ بازنگری 24 شهریور 1403
  • تاریخ پذیرش 21 آبان 1403