اثر تنش پسماند بر عمر خستگی پرچرخه پیستون پوشش داده شده

نوع مقاله : مقاله پژوهشی

نویسنده

دانشکده مهندسی مکانیک، واحد ورامین-پیشوا، دانشگاه آزاد اسلامی، تهران، ایران

چکیده

پیستون قلب یک موتور است که تحت بارگذاری حرارتی و مکانیکی قرار دارد. خستگی ناشی از تنش‌های ترمومکانیکی نقش موثری در ایجاد آسیب و کاهش عمر خستگی پیستون دارد. هدف این پژوهش ارزیابی اثر تنش پسماند بر عمر خستگی پرچرخه پیستون پوشش داده شده موتور XU7JP/L3 است. در این پژوهش، تحلیل عمر خستگی پرچرخه پیستون با استفاده از روش اجزای محدود و نرم‌افزار انسیس به منظور پیش‌بینی دما و تنش و سپس عمر خستگی پرچرخه با استفاده از تئوری گودمن و نرم‌افزارانسیس ان‌کددیزاین انجام شده است. نتایج تحلیل ترمومکانیکی نشان داد که سیستم پوشش حائل حرارتی باعث کاهش تنش در پیستون در حدود 9 مگاپاسکال یا 10 درصد می‌شود. نتایج تحلیل اجزای محدود نشان داد که تنش و تعداد سیکل‌های گسیختگی در ناحیه بالای پین پیستون بحرانی هستند. عمر خستگی پرچرخه پیستون بدون پوشش و پوشش داده شده بترتیب 108*2/51 و 108*3/415 سیکل پیش‌بینی گردید. نتایج تحلیل عمر خستگی پرچرخه نشان داد که تعداد سیکل‌های گسیختگی پیستون پوشش داده شده حدود 36 درصد بیشتر از پیستون پوشش داده نشده است. باتوجه به نتایج تحلیل عمر خستگی پرچرخه، درنظر نگرفتن اثر تنش پسماند  باعث می‌شود که تعداد سیکل‌های گسیختگی حدود 6/4 درصد بیشتر از میزان مجاز تخمین زده شود. بنابراین لازم است اثر تنش پسماند در تحلیل ترمومکانیکی و عمر خستگی پرچرخه پیستون پوشش داده شده درنظر گرفته شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effect of residual stress on high cycle fatigue life of coated piston

نویسنده [English]

  • Hojjat Ashouri
Department of Mechanical Engineering, Varamin-Pishva Branch, Islamic Azad University, Varamin, Iran
چکیده [English]

The piston is the heart of the engine that undergoes thermal and mechanical loading. Fatigue due to thermo-mechanical stresses plays an effective role in causing damage and reducing piston fatigue life. This study aims to evaluate the effect of residual stress on the high cycle fatigue (HCF) life for the XU7JP/L3 engine-coated piston. In this paper, HCF life analysis of the piston is performed by using the finite element method and ANSYS software to predict the temperature and stresses, and then HCF life by using Goodman theory and ANSYS nCode Design Life software. The numerical results showed that the temperature maximum occur at the piston crown center. The obtained thermo-mechanical analysis results proved that the thermal barrier coating system reduces the stress distribution in the piston by about 9 MPa or 10%. The results of finite element analysis (FEA) indicated that the stress and number of cycles to failure have the most critical values at the upper portion of the piston pin. The high cycle fatigue life of the uncoated and coated piston predicted 2.51*108 and 3.415*108 cycles, respectively. The HCF life results showed that the number of cycles of failure for the coated piston is approximately 36% higher than for the uncoated- piston. According to the fatigue life analysis results, neglecting the residual stress effect led to estimating about 6.4% higher than the limit. The results of finite element analysis showed that the residual stress is significant which is not negligible.  Therefore, it is necessary to consider the residual stress effect in the thermo-mechanical analysis and HCF life of the coated piston. Thermo-mechanical analysis and HCF life results are compared with experimentally damaged pistons to evaluate the results appropriately. It has been shown that the critical identified area matches well with the area of failure in the experimental sample.

کلیدواژه‌ها [English]

  • Piston
  • Finite Element Analysis
  • High Cycle Fatigue Life
  • Residual Stress

مراجع

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نشریه مهندسی مکانیک امیرکبیر
دوره 56، شماره 12
1403
صفحه 1691-1708

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