Abstract




 
   

IJE TRANSACTIONS C: Aspects Vol. 31, No. 3 (March 2018) 473-479    Article in Press

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  THE ANALYSIS OF WHEEL LOADER DIESEL ENGINE CRANKSHAFT FAILURE
 
K. Aliakbari, N. Safarzadeh and S. S. Mortazavi
 
( Received: September 09, 2017 – Accepted in Revised Form: October 12, 2017 )
 
 

Abstract    The main purpose of this study is to review the cause for the crankshaft failure of six-cylinder diesel engine of a wheel loader after passing a short period of time. The failure had occurred after 4800 hours of in-service in the fifth crankpin of the crankshaft. Hardness and tensile tests were carried out to study their mechanical properties. Spectrophotometer machine was used to examine the chemical composition of the crankshaft material. To examine the material microstructure, its defects and the morphology of fracture surface, optical microscopes (OM) and scanning electronic microscopes (SEM) equipped with energy dispersive spectrometry (EDS) were used. The morphology of fracture surface showed that the fracture is of the smooth type and has occurred due to the fatigue. Main origin of the fatigue cracks appeared on the surface of the crankpin might be created by the existence of oil impurities, the impurities on the surface of the crankpin, inappropriate machining on the surface of the crankpin or severe wear and pitting from insufficient lubricating.

 

Keywords    Automotive engineering, Wheel loader, Crankshaft failure, Fatigue crack, Failure cause

 

چکیده    هدف اصلی این مطالعه بررسی علت شکست میل لنگ موتور شش سیلندر دیزل لودر پس از مدت زمان کوتاه است. شکست پس از حدود 4800 ساعت در پنجمین محور لنگ از محل محور لنگ اتفاق افتاده بود. برای بررسی خواص مکانیکی تست‏های سختی و کشش انجام گرفت و از دستگاه اسپکتروفتومتر برای بررسی ترکیب شیمیایی عناصر تشکیل دهنده میل لنگ استفاده گردید. برای بررسی ریزساختار، عیوب، سطح شکست و علت شکست از میکروسکوپ‏های نوری و میکروسکوپ الکترونی روبشی (SEM) مجهز به طیف سنجی پراش انرژی پرتو ایکس (EDS) استفاده شدند. مورفولوژی سطح شکست نشان داد شکست از نوع نرم و در اثر خستگی روی داده است. محل شروع ترک خستگی از سطح قطعه میباشد که عامل آن میتواند حضور ناخالصی ناشی از روغن و یا ناخالصی در سطح محورلنگ، خطوط ناشی از ماشینکاری نامناسب روی سطح محورلنگ و یا سایش شدید و ایجاد حفره در اثر روانکاری نامناسب روی سطح باشد.

References   

1.      Wulpi, D.J., "Understanding how components fail, ASM international,  (2013).

2.      Inc, C., "Caterpillar performance handbook, Caterpillar,  (1988).

 

 

 

 

 

3.      Fonte, M., Infante, V., Freitas, M. and Reis, L., "Failure mode analysis of two diesel engine crankshafts", Procedia Structural Integrity,  Vol. 1, No., (2016), 313-318.

4.      Fonte, M., Duarte, P., Reis, L., Freitas, M. and Infante, V., "Failure mode analysis of two crankshafts of a single cylinder diesel engine", Engineering Failure Analysis,  Vol. 56, No., (2015), 185-193.

5.      Fonte, M., Li, B., Reis, L. and Freitas, M., "Crankshaft failure analysis of a motor vehicle", Engineering Failure Analysis,  Vol. 35, No., (2013), 147-152.

6.      Alfares, M., Falah, A. and Elkholy, A., "Failure analysis of a vehicle engine crankshaft", Journal of Failure Analysis and Prevention,  Vol. 7, No. 1, (2007), 12-17.

7.      Pandey, R., "Failure of diesel-engine crankshafts", Engineering Failure Analysis,  Vol. 10, No. 2, (2003), 165-175.

8.      Fonte, M., Duarte, P., Anes, V., Freitas, M. and Reis, L., "On the assessment of fatigue life of marine diesel engine crankshafts", Engineering Failure Analysis,  Vol. 56, No., (2015), 51-57.

9.      Farrahi, G., Hemmati, F., Gangaraj, S.A. and Sakhaei, M., "Failure analysis of a four cylinder diesel engine crankshaft made from nodular cast iron", The Journal of Engine Research,  Vol. 22, No., (2011).

10.    Becerra, J., Jimenez, F., Torres, M., Sanchez, D. and Carvajal, E., "Failure analysis of reciprocating compressor crankshafts", Engineering Failure Analysis,  Vol. 18, No. 2, (2011), 735-746.

11.    Silva, F., "Analysis of a vehicle crankshaft failure", Engineering Failure Analysis,  Vol. 10, No. 5, (2003), 605-616.

12.    Fonte, M. and Freitas, M., "Semi‐elliptical fatigue crack growth under rotating or reversed bending combined with steady torsion", Fatigue & Fracture of Engineering Materials & Structures,  Vol. 20, No. 6, (1997), 895-906.

13.    Stevenson, M., Klepacki, D., McDougall, J. and Alexander, D., "Failure investigation of an aircraft crankshaft gear connection", Journal of Failure Analysis and Prevention,  Vol. 12, No. 6, (2012), 617-623.

14.    Pantazopoulos, G. and Vazdirvanidis, A., "Fatigue fracture of cast steel plate connected in a power transmission joint assembly", Journal of Failure Analysis and Prevention,  Vol. 12, No. 3, (2012), 237-241.

15.    Pantazopoulos, G. and Papaefthymiou, S., "Failure and fracture analysis of austenitic stainless steel marine propeller shaft", Journal of Failure Analysis and Prevention,  Vol. 15, No. 6, (2015), 762-767.

16.    Aliakbari, K. and Farhangdoost, K., "Plastic deformation influence on material properties of autofrettaged tubes used in diesel engines injection system", Journal of Pressure Vessel Technology,  Vol. 136, No. 4, (2014), 041402.

17.    Pelaseyed, S., Mashayekhi, F. and Movahedi-Rad, A., "Investigation of the shaft failure connected to extruder", Journal of Failure Analysis and Prevention,  Vol. 15, No. 6, (2015), 775-781.

18.    International, A., Committee, A.I.H. and Committee, A.I.A.P.D., "Metals handbook: Properties and selection, ASM international,  Vol. 2,  (1990).

19.             Zhu, X., Xu, J., Liu, Y., Cen, B., Lu, X. and Zeng, Z., "Failure analysis of a failed connecting rod cap and connecting bolts of a reciprocating compressor", Engineering Failure Analysis,  Vol. 74, No., (2017), 218-227. 


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