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اثر تنش ویسکوزیته بر عمر خستگی کمچرخه سرسیلندر | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| دوره 56، شماره 8، 1403، صفحه 1053-1074 اصل مقاله (1.44 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2024.23563.7782 | ||
| نویسنده | ||
| حجت عاشوری* | ||
| دانشکده مهندسی مکانیک، واحد ورامین-پیشوا، دانشگاه آزاد اسلامی، تهران، ایران | ||
| چکیده | ||
| یکی از مهمترین مسائل دوام موتور ترکهای ایجاد شده در پل بین سوپاپهای سرسیلندر است. بنابراین شبیهسازی و تحلیل ترکهای خستگی ضروری است. در این پژوهش، تحلیل عمر خستگی کمچرخه سرسیلندر با استفاده از روش اجزای محدود و نرمافزار انسیس به منظور پیشبینی دما و تنش و سپس عمر خستگی کمچرخه با استفاده از تئوری مارو و نرمافزار انکد دیزاین لایف انجام شده است. از ترکیب الگوی سختشوندگی غیرخطی همگن-سینماتیک چابوچه با قانون تنش ویسکوز به منظور درنظر گرفتن اثر تنش ویسکوزیته استفاده شده است. خواص مکانیکی آلیاژ آلومینیم- سیلیسیم-منیزیم با استفاده از تستهای خستگی کمچرخه در دماهای مختلف بدست آمده است. تستهای خستگی کمچرخه به وسیله نرمافزار انسیس شبیهسازی شد و نشان داده شد که انطباق بسیار مناسبی بین نتایج تجربی و شبیهسازی شده وجود دارد. نتایج تحلیل اجزای محدود نشان داد که ماکزیمم دما و تنش در سرسیلندر 205.67 درجه سانتیگراد و 83.958 مگاپاسکال است. نتایج تحلیل عمر خستگی کمچرخه نشان داد که درنظر نگرفتن اثر تنش ویسکوزیته باعث میشود که تعداد سیکلهای گسیختگی 105 سیکل یا حدود 5.9 درصد بیشتر از میزان مجاز تخمین زده شود. بنابراین لازم است اثر تنش ویسکوزیته در تحلیل عمر خستگی کمچرخه سرسیلندر درنظر گرفته شود. | ||
| کلیدواژهها | ||
| سرسیلندر؛ تحلیل اجزای محدود؛ خستگی کمچرخه و تنش ویسکوزیته | ||
| عنوان مقاله [English] | ||
| Effect of viscosity stress on the low cycle fatigue of the cylinder head | ||
| نویسندگان [English] | ||
| Hojjat Ashouri | ||
| Department of Mechanical Engineering, Varamin-Pishva Branch, Islamic Azad University, Varamin, Iran | ||
| چکیده [English] | ||
| Loading conditions and complex geometry have led the cylinder head to become the most challenging component in the engine. The cracks in valves in bridge areas are one of the vital durability problems in engines, showing the necessity of the simulation and analysis of fatigue cracks. The present study used the finite element method to analyze the low cycle fatigue (LCF) life. The ANSYS software was also used to predict the temperature, stresses, and LCF life through Morrow theory and nCode Design Life software. The LCF tests were conducted at different temperatures to obtain the mechanical properties of aluminum-silicon-magnesium alloy. The combination of the Chaboche nonlinear isotropic-kinematic hardening model with viscous stress law was used to consider the effect of stress viscosity. LCF tests were simulated by ANSYS software, showing a very good fit between the experimental and simulation results of LCF tests. The results of finite element analysis suggested that the maximum temperature and stress values in the cylinder head were 205.67°C and 83.958MPa. According to the fatigue life analysis results, neglecting the stress viscosity effect led to estimating 105 cycles, or about 5.9% higher than the limit. Therefore, it is necessary to consider the stress viscosity effect in the analysis of the low cycle fatigue life of the cylinder head. | ||
| کلیدواژهها [English] | ||
| Cylinder Head, Finite Element Analysis, Low Cycle Fatigue, Viscosity Stress | ||
| مراجع | ||
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