مطالعه عددی رشد ترک زیرسطحی در پدیده اسپالینگ دندانه چرخ‌دنده ساده

نوع مقاله : مقاله علمی

نویسندگان
1 استادیار، دانشکده مهندسی مکانیک، بزرگمهر قائنات، قاین، ایران
2 استاد، دانشکده مهندسی مکانیک، فردوسی مشهد، مشهد، ایران
چکیده
چرخ‌دنده‌ها قطعات مکانیکی پر‌کاربردی هستند که حرکت دورانی را با درگیری پهلوی دندانه‌ها منتقل می‌کنند. ازآنجایی‌که چرخ‌دنده‌ها در سیستم انتقال قدرت یک مجموعه به کار گرفته می‌شوند، خرابی آن‌ها منجر به از کار افتادن مجموعه خواهد گردید. پس پیش‌بینی عوامل خرابی برای اطمینان از یک طراحی مناسب، اهمیت می‌یابد. خرابی سطح دندانه شامل مواردی از قبیل سایش، پیتینگ و اسپالینگ می‌باشد. با توجه به زمان‌بر و پر‌هزینه بودن مطالعات تجربی پدیده خستگی، باید به دنبال بهبود مدل‌های عددی بود و این مدل‌ها را به شرایط واقعی مسئله نزدیک کرد. هدف این پژوهش این است که یک مدل عددی برای پیش‌بینی پیدایش و رشد ترک خستگی زیر‌سطحی تحت بارگذاری تماسی چرخه‌ای ارائه کند. در این مطالعه از نرم‌افزار آباکوس برای مدل‌سازی دوبعدی یک جفت دندانه در تماس، استفاده شده است. تحلیل به روش اجزای محدود استاندارد با رشد نموی ترک انجام شد. زاویه رشد ترک طبق معیار بهبودیافته ریچارد تعیین گردید. نتایج این پژوهش نشان داد که موقعیت ΔKII بیشینه، با حدود 9% اختلاف، بهترین تطابق را با کف اسپالینگ تجربی دارد. درنتیجه موقعیت ΔKII بیشینه به‌عنوان معیار موقعیت جوانه‌زنی ترک زیرسطحی پیشنهاد گردید. ضریب شدت تنش برای نوک چپ و راست ترک اولیه زیرسطحی یکسان بوده و هر دو نوک به‌صورت هم‌زمان شروع به رشد می‌کنند. در این مدل برای تعیین زاویه رشد ترک از معیار بهبود‌یافته ریچارد استفاده شد که منجر به پیش‌بینی اسپالینگ با ابعاد نزدیک به اسپالینگ تجربی می‌شود. طول دهانه اسپالینگ پیش‌بینی‌شده حدود 6% اختلاف نسبت به اسپالینگ تجربی نشان داد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Numerical study of subsurface crack growth in the spalling phenomenon of a spur gear tooth

نویسندگان English

Hasan Heirani 1
Khalil Farhangdoost 2
1 Assistant professor, Department of Mechanical Engineering, Bozorgmehr University of Qaenat, Qaen, Iran
2 Professor, Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
چکیده English

Gears are components that transmit rotational motion by engaging the gear teeth. Since gears are used in the power transmission system, their failure will lead to the mechanism failure. So, predicting failure factors is important to ensure a proper design. Tooth surface failure includes cases such as wear, pitting and spalling. Considering that experimental studies of fatigue phenomena are time-consuming and expensive, it is necessary to improve numerical models and bring them as close as possible to real conditions. The aim of this research is to present a numerical model to predict the subsurface fatigue crack initiation and growth under cyclic contact loading. In this study, Abaqus software was used for 2D modeling of a pair of teeth in contact. The analysis was performed using standard finite element method with progressive crack growth. The crack growth angle was determined according to the improved Richard criterion. The results showed that the maximum ΔKII position, with about 9% error, has the best agreement with the experimental spalling. So, the maximum ΔKII position was proposed as a criterion for determining the subsurface crack initiation position. The stress intensity factor of initial subsurface crack left and right tips is the same, and so, both tips start to grow simultaneously. In this model, the improved Richard criterion was used to determine the crack growth angle, which leads to the prediction of a spalling with dimensions close to the experimental spalling. The predicted spalling length showed a difference of about 6% compared to the experimental spalling.

کلیدواژه‌ها English

Spalling
Gear
Contact fatigue
Subsurface crack
Crack initiation and growth

اصل مقاله

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  • تاریخ دریافت 08 شهریور 1404
  • تاریخ بازنگری 30 مهر 1404
  • تاریخ پذیرش 01 آذر 1404
  • تاریخ اولین انتشار 01 آذر 1404
  • تاریخ انتشار 01 بهمن 1404