Abstract




 
   

IJE TRANSACTIONS B: Applications Vol. 31, No. 5 (May 2018) 795-803    Article in Press

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  A STUDY ON THE CONTACT ELLIPSE AND THE CONTACT PRESSURE DURING THE WHEEL WEAR THROUGH PASSING THE TRACKS INCLUDING SEVERAL SHARP CURVES
 
S.M. Salehi, G. H. Farrahi and S. Sohrabpoor
 
( Received: December 19, 2017 – Accepted: February 19, 2018 )
 
 

Abstract    Wheel wear has been a concern in the railway for several decades. Studying the form change of the wheel/rail contacts in particular railways consisting of sharp curves helps to identify the risk of severe or catastrophic wear to minimize maintenance costs in order to be competitive in the transportation business. In this paper, the wheel/rail contact was studied on the particular railways. The experimental measurement of wheel profiles was used as an input to the Hertz contact theory (HCT). It was found that: 1) for these railways the wheel flange is highly worn; 2) a 5th order polynomial function is appropriate to model the wear behavior of the critical wheel; 3) the minimum and maximum contact ellipse surface areas occur in Sd=22.29 mm and Sd=32 mm, respectively; 4) the maximum and minimum surface areas of the contact ellipse occur at points in which the contact pressure are minimum and maximum, respectively; and finally 5) the flange thickness region between 25 to 29 mm can be chosen as an appropriate range for the wheel maintenance purposes.

 

Keywords    Wheel Wear, Maintenance Technique, Sharp Curved Railways, Empirical Study, Wheel Flange Wear, Wheel Longevity Enhancement

 

چکیده    در دهه‌های گذشته، سایش چرخ به عنوان یکی از نگرانی‌ها در حمل‌ونقل ریلی بوده است. مطالعه تغییر شکل تماس‌های چرخ و ریل در خطوط خاصی که شامل پیچ‌های تند هستند به شناسایی خطرات ناشی از سایش شدید یا فاجعه‌بار کمک می‌کند تا هزینه‌های تعمیرونگهداری به منظور رقابتی شدن در کسب و کار حمل‌ونقل به حداقل برسد. در این مقاله، تماس چرخ و ریل در این مسیرهای خاص مورد مطالعه قرار گرفته است. اندازه‌گیری‌های تجربی پروفیل‌های چرخ به عنوان یک ورودی برای تئوری تماس هرتس (HCT) مورد استفاده قرار گرفته است. یافته‌ها حاکی از آن است که: 1) برای این نوع خطوط راه‌آهن، سایش زیادی در فلنج چرخ رخ می‌دهد؛ 2) یک تابع چندجمله‌ای مرتبه 5 برای مدلسازی رفتار سایشی چرخ بحرانی مناسب است؛ 3) حداقل و حداکثر مساحت‌های سطح بیضی تماس به ترتیب در ضخامت‌های فلنج 22.29 و 32 میلیمتر رخ می‌دهد؛ 4) حداکثر و حداقل مساحت‌های سطح بیضی تماس در نقاطی که در آن فشار تماس حداقل و حداکثر است رخ می دهد؛ و در نهایت 5) ناحیه ضخامت فلنج بین 25 تا 29 میلیمتر را می‌توان به عنوان محدوده مناسب برای اهداف تعمیرونگهداری چرخ انتخاب کرد.

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