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Ashouri, H., Beheshti, B., Ebrahimzadeh, M. (2016). Analysis of Fatigue Cracks of Diesel Engines Cylinder Heads using a Two-Layer Viscoplasticity Model and Considering Viscousity Effects. Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 9(1), 105-120.
Hojjat Ashouri; Babak Beheshti; Mohammad Reza Ebrahimzadeh. "Analysis of Fatigue Cracks of Diesel Engines Cylinder Heads using a Two-Layer Viscoplasticity Model and Considering Viscousity Effects". Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 9, 1, 2016, 105-120.
Ashouri, H., Beheshti, B., Ebrahimzadeh, M. (2016). 'Analysis of Fatigue Cracks of Diesel Engines Cylinder Heads using a Two-Layer Viscoplasticity Model and Considering Viscousity Effects', Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 9(1), pp. 105-120.
Ashouri, H., Beheshti, B., Ebrahimzadeh, M. Analysis of Fatigue Cracks of Diesel Engines Cylinder Heads using a Two-Layer Viscoplasticity Model and Considering Viscousity Effects. Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 2016; 9(1): 105-120.

Analysis of Fatigue Cracks of Diesel Engines Cylinder Heads using a Two-Layer Viscoplasticity Model and Considering Viscousity Effects

Article 8, Volume 9, Issue 1 - Issue Serial Number 27, Spring 2016, Page 105-120  XML PDF (1082 K)
Document Type: Persian
Authors
Hojjat Ashouri1; Babak Beheshti* 2; Mohammad Reza Ebrahimzadeh3
1PhD Student, Department of Agricultural Machinery, Science and Research Branch, Islamic Azad University, Tehran, Iran
2Assistant Prof., Department of Agricultural Machinery, Science and Research Branch, Islamic Azad University, Tehran, Iran
3Assistant Prof., College of Agriculture, Yadegar - e- Imam Khomeini (Rah), Shahr-e-rey Branch, Islamic Azad University, Tehran, Iran
Abstract
Loading conditions and complex geometry have led the cylinder heads to become the most challenging parts of diesel engines. One of the most important durability problems in diesel engines is due to the cracks valves bridge area. The purpose of this study is a thermo-mechanical analysis of cylinder heads of diesel engines using a two-layer viscoplasticity model. The results of the thermo-mechanical analysis indicate that the maximum temperature and stress exist in the valves bridge. The results of the finite element analysis correspond with the experimental tests, carried out in references, and illustrate the cylinder heads cracked in this region. The results of the thermo-mechanical analysis show that when the engine is running the stress in the region is compressive caused by the thermal loading and combustion pressure. When the engine shuts off the compressive stress turns into the tensile stress because of assembly loads. The valves bridge is under the cyclic tensile and compressive stress and then is under low-cycle fatigue. After several cycles the fatigue cracks will appear in this region. The lifetime of this part can be determined through finite element analysis instead of experimental tests. Viscous strain is more than the plastic strain which is not negligible
Keywords
Thermo-mechanical fatigue; Finite element analysis; Cylinder heads; Valves bridge cracks
Article Title [Persian]
تحلیل ترکهای خستگی سرسیلندر موتور دیزل با استفاده از مدل ویسکوپلاستیسیته دو لایه و درنظر گرفتن اثر ویسکوزیته
Authors [Persian]
حجت عاشوری, بابک بهشتی, محمد رضا ابراهیم زاده
Abstract [Persian]
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
Keywords [Persian]
خستگی ترمومکانیکی، سرسیلندر موتور دیزل، تحلیل اجزای محدود، ترکهای پل سوپاپها
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