روشهای عددی در مهندسی

روشهای عددی در مهندسی

تحلیل خستگی تماس غلتشی بیرینگ‌ها در حضور روانکاری با روغن با در نظر گرفتن اثر حفره‌حفره شدن

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشکده مهندسی مکانیک، دانشگاه صنعتی اصفهان، اصفهان، ایران، صندوق پستی ۸۴۱۵۶۸۳۱۱۱
2 شرکت شاکرین گیربکس اصفهان، اصفهان، ایران، کدپستی 8161195117
چکیده
خستگی تماس غلتشی1 یکی از رایج‌ترین سازوکار‌های خرابی در یاتاقان‌ها است که به‌صورت ترک‌های سطحی و زیرسطحی ظاهر شده و نهایتاً به پدیده‌ی حفره‌حفره شدن2 منجر می‌شود. این خرابی که پیامد تنش‌های تکراری در ناحیه تماس بین عنصر غلتشی و مسیر غلتش است، عملکرد سامانه را به‌صورت جدی تحت تأثیر قرار می‎دهد و پیش‌بینی دقیق آن از دیدگاه طراحی و دوام ضروری است. در این پژوهش، به‌منظور برآورد دقیق‌تر عمر خستگی ناشی از حفره‌حفره شدن، ابتدا ضریب اصطکاک واقعی تماس بر اساس داده‌های تجربی معتبر تعیین و سپس تنش‌های سطحی و زیرسطحی هرتز محاسبه شد. تحلیل‌ها نشان می‌دهد که تنش برشی زیرسطحی بیشینه نقش تعیین‌کننده‌ای در آغاز ترک‌های مرتبط با حفره‌حفره شدن دارد. در ادامه، سه مدل خستگی شامل مدل مکانیک آسیب پیوسته3، مدل تجربی یوانیدیس-هریس4 و مدل آماری زارتسکی5 پیاده‌سازی و مقایسه شده‌اند. نتایج نشان می‌دهند مدل مکانیک آسیب پیوسته در بارهای بالا دقت بیشتری داشته، مدل زارتسکی پیش‌بینی‌هایی نزدیک به داده‌های تجربی ارائه می‌کند و مدل یوانیدیس-هریس به دلیل وجود حد خستگی، رفتار محافظه‌کارانه‌تری در برخی بازه‌های تنش دارد. اختلاف این پیش‌بینی‌ها اهمیت انتخاب مدل مناسب و نقش آستانه خستگی در تحلیل عمر را برجسته می‌کند. یافته‌های این تحقیق با ارائه چارچوبی ساده، می‌تواند در طراحی و بهبود عملکرد یاتاقان‌های صنعتی مورد استفاده قرار گیرد
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Rolling Contact Fatigue Analysis of Bearings in the Presence of Oil Lubrication Considering the Effect of Pitting

نویسندگان English

Zahra Isavi 1
Hamid Shakerin 2
Saleh Akbarzadeh 1
1 Department of Mechanical Engineering, Isfahan University of Technology, Isfahan 8415683111, Iran
2 Isfahan Shakerin Gearbox CO, Isfahan, 8161195117, Iran
چکیده English

Abstract: Rolling contact fatigue is one of the most common failure mechanisms in bearings, manifesting as surface and subsurface cracks that ultimately lead to pitting. This failure, resulting from repeated stresses in the contact region between the rolling element and the raceway, can severely affect system performance, making its accurate prediction essential from a design and durability perspective. In this study, in order to achieve a more accurate estimation of fatigue life associated with pitting, the actual contact friction coefficient is first determined based on reliable experimental data, and then the Hertzian surface and subsurface stresses are calculated. The analyses indicate that the maximum subsurface shear stress plays a decisive role in the initiation of cracks associated with pitting. Subsequently, three fatigue models‚ the continuum damage mechanics model, the Ioannides–Harris empirical model, and the Zaretsky statistical model are implemented and compared. The results show that the continuum damage mechanics model provides higher accuracy under high load conditions, the Zaretsky model yields predictions close to experimental data, and the Ioannides–Harris model exhibits more conservative behavior in certain stress ranges due to the presence of a fatigue limit. The discrepancies among these predictions highlight the importance of selecting an appropriate fatigue model and the role of the fatigue threshold in life assessment. The findings of this research, by offering a simple yet accurate framework, can be applied to the design and performance improvement of industrial bearings.

کلیدواژه‌ها English

Rolling contact fatigue, Fatigue limit, Ioannides&ndash
Harris model, Pitting, Subsurface shear stress, Continuum damage mechanics
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