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:: جلد 22، شماره 22 - ( 1-1390 ) ::
جلد 22 شماره 22 صفحات 21-28 برگشت به فهرست نسخه ها
آنالیز شکست میل لنگ چدنی با گرافیت کروی موتور دیزلی چهار سیلندر
غلامحسین فرهی، سید مصطفی حسنی گنگرج، سعید ابوالحسنی، فرزاد همتی، مهریار سخایی
چکیده:   (13420 مشاهده)
The premature breakage in some four cylinder diesel engine crankshafts was reported. All crankshafts were failed from the same region. Failures had occurred in the first crankpin, the nearest crankpin to the flywheel. Dynamic analysis and finite element modelling were carried out to determine the state of stress in the crankshaft. FEM results revealed that the first crankpin fillet is the most vulnerable point to fracture. Soderburg diagram of the studied crankshaft showed that the service operation point, which stands for mean and alternating stresses of the critical region (first crankpin fillet) was located in the safe region. Therefore, it can be concluded that fatigue fracture has not occurred in the crankshaft. SEM images of the fractured surface also showed cleavage fracture and put in evidence that the failure was brittle fracture. No sign of fatigue failure was observed. The fracture may have been caused by an overload. However, the results suggest re-evaluation of the design and manufacturing. The fillet rolling may play an important role in this matter. Optimization of the fillet rolling process by changing process parameters has been recommended to the manufacturer. This recommendation has been adopted by the manufacturer and no further fracture has been reported since.
واژه‌های کلیدی: Crankshaft، Failure Analysis، Fracture، Fatigue
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نوع مطالعه: مطالعه پژوهشي |
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Farrahi G, Hassani Gangaraj S, Abolhassani S, Hemmati F, Sakhaei M. Failure Analysis of a Four Cylinder Diesel Engine Crankshaft Made From Nodular Cast Iron. JER. 2011; 22 (22) :21-28
URL: http://engineresearch.ir/article-1-193-fa.html

فرهی غلامحسین، حسنی گنگرج سید مصطفی، ابوالحسنی سعید، همتی فرزاد، سخایی مهریار. آنالیز شکست میل لنگ چدنی با گرافیت کروی موتور دیزلی چهار سیلندر. فصلنامه تحقیقات موتور. 1390; 22 (22) :21-28

URL: http://engineresearch.ir/article-1-193-fa.html



جلد 22، شماره 22 - ( 1-1390 ) برگشت به فهرست نسخه ها
فصلنامه تحقیقات موتور The Journal of Engine Research
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