تحلیل ترکهای خستگی سرسیلندر موتور دیزل با استفاده از مدل ویسکوپلاستیسیته دو لایه و درنظر گرفتن اثر ویسکوزیته

Subject Areas : Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering

حجت عاشوری ¹ (PhD Student, Department of Agricultural Machinery, Science and Research Branch, Islamic Azad University, Tehran, Iran)
بابک بهشتی ² (Assistant Prof., Department of Agricultural Machinery, Science and Research Branch, Islamic Azad University, Tehran, Iran)
محمد رضا ابراهیم زاده ³ (Assistant Prof., College of Agriculture, Yadegar - e- Imam Khomeini (Rah), Shahr-e-rey Branch, Islamic Azad University, Tehran, Iran)

Received: 2017-02-26 Accepted : 2017-02-26 Published : 2016-04-20

Keywords: تحلیل اجزای محدود, خستگی ترمومکانیکی, سرسیلندر موتور دیزل, ترکهای پل سوپاپها,

Abstract :

سرسیلندر موتور دیزل بعلت بارگذاری و هندسه پیچیده آن یکی از چالش برانگیزترین قطعات موتور است. یکی از مهمترین مسائل دوام موتورهای دیزل ترکهای ایجاد شده در پل بین دریچه ها است.  هدف این پژوهش، تحلیل ترمومکانیکی سرسیلندر موتور دیزل با استفاده از الگوی ویسکوپلاستیسیته دو لایه است. نتایج تحلیل ترمومکانیکی نشان داد که ماکزیمم دما و تنش در ناحیه پل بین دو سوپاپ گاز و دود رخ می­دهد. نتایج تحلیل المان محدود با آزمونهای تجربی انجام شده در منابع که سرسیلندر در این ناحیه ترک خورده است، مطابقت دارد. نتایج تحلیل ترمومکانیکی نشان داد که تنش در این ناحیه در زمان روشن بودن موتور فشاری است که ناشی از بارگذاری حرارتی و فشار احتراق است. تنش فشاری بعد از خاموش شدن موتور به تنش کششی تبدیل می­شود که ناشی از بارهای همبندی است. پل بین دو سوپاپ گاز و دود تحت تنش سیکلی کششی و فشاری و درنتیجه تحت خستگی کم­چرخه قرار دارد. بعد از چند سیکل ترکهای خستگی در این ناحیه ایجاد می­شود. عمر این ناحیه را می­توان با تحلیلهای المان محدود به جای آزمونهای اعتبارسنجی تعیین نمود. مقدار کرنش ویسکوز از کرنش پلاستیک بیشتر بود و مقدار آن قابل صرفنظر کردن نیست

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