تحقیقات موتور

تحقیقات موتور

پیش‌‏بینی عمر خستگی ترمومکانیکی چندراهة دود براساس الگوی سیتقلو با آسیب اکسیدشدن و خزش

نوع مقاله : مقاله پژوهشی

نویسنده
دانشکده مهندسی مکانیک، واحد ورامین-پیشوا، دانشگاه آزاد اسلامی، ورامین، ایران
چکیده
امروزه چندراهة دود تنش حرارتی بیشتری را نسبت به گذشته تحمل می­‌کند. علت این امر افزایش قدرت خروجی موتور، کاهش مصرف سوخت و گازهای آلاینده است. بنابراین شبیه‌­سازی و تحلیل ترک‏‌های خستگی ضروری است. در این پژوهش، تحلیل عمر خستگی ترمومکانیکی چندراهة دود با استفاده از روش اجزای محدود و نرم­‌افزار آباکوس به منظور پیش‌بینی دما و تنش و سپس عمر خستگی ترمومکانیکی با استفاده از نظریة سیتقلو و نرم­‌افزار فمفت انجام شده است. خواص مکانیکی چدن داکتیل (HiSiMo) با استفاده از آزمون‏‌های خستگی کم­‌چرخه و کشش در دماهای مختلف بدست آمده است. نتایج تحلیل اجزای محدود نشان داد که بیشینة دما و تنش در چندراهة دود بترتیب 757.4 درجة سانتیگراد و 321.8 مگاپاسکال است و موقعیت آن در ناحیة همریختگاه است. نتایج شبیه­‌سازی شده نشان داد که حداقل عمر خستگی ترمومکانیکی در ناحیه‌­ای که دما و تنش بیشینه است، رخ می‌­دهد. نتایج تحلیل خستگی ترمومکانیکی ثابت کرد که آسیب مکانیکی نقش برجسته‌­ای در خستگی ترمومکانیکی چندراهة دود دارد. آسیب اکسیدشدن از آسیب خزش بیشتر بود و قابل چشم‌‏پوشی نیست.
کلیدواژه‌ها

عنوان مقاله English

Thermo-mechanical fatigue life prediction for exhaust manifold based on Sehitoglu model considering oxidation and creeping damages

نویسنده English

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

The exhaust manifolds are subjected to higher thermal stress than before, due to the increasing engine power output, fuel consumption, and gas emission. Thus, simulation and analysis of fatigue cracks are essential. In this paper, thermo-mechanical fatigue (TMF) life analysis of the exhaust manifold is performed by using finite element method (FEM) and ABAQUS software to predict the temperature and stresses and then TMF fatigue life by using Sehitoglu theory and FEMFAT software. Mechanical properties of High silicon molybdenum (HiSiMo) ductile cast irons (DCI) obtained by LCF and tensile tests at different temperatures. The results of finite element analysis (FEA) showed that the maximum temperature and stress values in the exhaust manifold are 757.4 °C and 321.8 MPa and the position is at the confluence region. The numerical results showed that the area where the maximum temperature and stress occur is where the least TMF life is estimated. The obtained TMF results proved that mechanical damage plays a leading role in the total TMF life of the exhaust manifold. The oxidation damage was greater than the creep damage which is not negligible.

کلیدواژه‌ها English

Thermo-mechanical Fatigue
Finite Element Analysis
Exhaust Manifold
Sehitoglu Theory
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دوره 71، شماره 4 - شماره پیاپی 77
مقالات انگلیسی
زمستان 1403
صفحه 1-14

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