CAJ | 학술논문

针对地铁折返线道岔伤损严重及使用寿命短等问题,利用有限元方法建立道岔区三维弹塑性轮轨接触计算模型,分析尖轨刨切部位轨距角半径对尖轨接触应力和内部应力的影响。模型中车轮型面采用实测磨耗状态 LM型车轮型面。结果表明：轨距角半径从13 mm增加到17 mm,顶宽20 mm 断面接触应力最大值从1170 MPa增加到1606 MPa,其 Von Mises应力最大值从528.33 MPa增大至573.68 MPa,进入塑性变形阶段,将导致尖轨的磨耗严重；顶宽35.5 mm及其以上断面接触应力最大值变化较小,其 Von Mises 应力最大值却随之减小,且均处于弹性变形阶段；增大尖轨断面粗壮度可以改善其受力状态,延长使用寿命；综合考虑尖轨受力状态,轨距角半径为13 mm时优于其他轨距角半径。
침대지철절반선도차상손엄중급사용수명단등문제,이용유한원방법건립도차구삼유탄소성륜궤접촉계산모형,분석첨궤포절부위궤거각반경대첨궤접촉응력화내부응력적영향。모형중차륜형면채용실측마모상태 LM형차륜형면。결과표명：궤거각반경종13 mm증가도17 mm,정관20 mm 단면접촉응력최대치종1170 MPa증가도1606 MPa,기 Von Mises응력최대치종528.33 MPa증대지573.68 MPa,진입소성변형계단,장도치첨궤적마모엄중；정관35.5 mm급기이상단면접촉응력최대치변화교소,기 Von Mises 응력최대치각수지감소,차균처우탄성변형계단；증대첨궤단면조장도가이개선기수력상태,연장사용수명；종합고필첨궤수력상태,궤거각반경위13 mm시우우기타궤거각반경。
In view of existing serious failures and short service life of switches of subway turnaround lines,a three-dimensional elastic-plastic model of wheel-rail contact for turnout zones was established by the finite ele-ment method to investigate the effect of radius of planing switch rail gauge corner on contact stresses and inter-nal stresses of switch rail.In the model,the measured wear profile of LM type was adopted for the wheel pro-file.The results show as follows:When the radius of rail gauge corner increases from 1 3 mm to 1 7 mm,for the section with the top width of 20 mm,the maximum contact stress increases from 1 170 MPa to 1 606 MPa and the maximum Von Mises stress increases from 528.33 MPa to 573.68 MPa,which means the plastic de-formation stage has been entered into,and this will lead to serious wearing of switch rails;for the section with the top width of 35.5 mm and above,the maximum contact stress is almost unchanged and the maximum Von Mises stress decreases,which means the elastic deformation stage has been entered into;an increase of the sec-tion top width can improve the stressing state of the switch rail so as to prolong its service life;the radius R=1 3 mm of the rail gauge corner is superior to other radii in comprehensive consideration of the stressing state of switch rail.