کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7167942 | 1462944 | 2017 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Failure mode analysis of a diesel motor crankshaft
ترجمه فارسی عنوان
تجزیه و تحلیل حالت شکست یک میل لنگ دیزل موتور
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کلمات کلیدی
میل لنگ، تجزیه و تحلیل حالت شکست خم شدن دوار، خم شدن معکوس، پیچ خوردگی پایدار،
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی صنعتی و تولید
چکیده انگلیسی
A failure mode analysis of a diesel motor (110Â kW) crankshaft from an automobile vehicle is presented. After 120,000Â km in service, an abnormal vibration was detected which was increasing with the time. The diesel motor was first disassembled for determining the root cause, however without success. No defect was detected, but since a suspicion of damage was present, and being this failure recurrent in this type of diesel motor series, the crankshaft was disassembled again. Then the crankshaft was subjected to a simple vibration analysis and a preliminary indication of possible existence of a crack was concluded. The crankshaft was then replaced by a new one, and the old was subjected to a failure analysis for determining the root cause. A crack was found at the crankpin web-fillet and after a complete opening of the crack, the failure analysis showed that fatigue was the dominant failure mechanism. Observations were carried out by optical and Scanning Electronic Microscope. Material defects at the crack initiation zone were not found. The root cause of damage seems to be a misalignment of the main journals and a weakness of design close to the gear at the region where the crack was initiated. Therefore, probably a poor design and a deficient assembling of the crankshaft helical gear coupled to the main journal end was the first cause of the failure.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Engineering Failure Analysis - Volume 82, December 2017, Pages 681-686
Journal: Engineering Failure Analysis - Volume 82, December 2017, Pages 681-686
نویسندگان
M. Fonte, V. Infante, L. Reis, M. Freitas,