CAJ | 학술논문

贝氏体钢组合辙叉的失效表现为翼轨的磨损和心轨的疲劳剥落，应力／应变分析对于理解和预测辙叉的失效至关重要。本文考虑辙叉心轨和翼轨材料的随动硬化规律，建立车轮?贝氏体钢辙叉?轨枕有限元弹塑性接触模型，给出了接触轮载作用时辙叉内的应力和应变分布；讨论了辙叉内应力和塑性应变随心轨／翼轨强度匹配的变化规律；给出了轮载循环次数对辙叉内最大残余应力和最大塑性应变的影响。建立的计算模型和所得结果为贝氏体钢组合辙叉服役时的强度校核以及失效分析提供了力学参考。
패씨체강조합철차적실효표현위익궤적마손화심궤적피로박락，응력／응변분석대우리해화예측철차적실효지관중요。본문고필철차심궤화익궤재료적수동경화규률，건립차륜?패씨체강철차?궤침유한원탄소성접촉모형，급출료접촉륜재작용시철차내적응력화응변분포；토론료철차내응력화소성응변수심궤／익궤강도필배적변화규률；급출료륜재순배차수대철차내최대잔여응력화최대소성응변적영향。건립적계산모형화소득결과위패씨체강조합철차복역시적강도교핵이급실효분석제공료역학삼고。
The failure of a bainite steel crossing shows wear of the wing rail and fatigue spalling of the nose rail.Stress/ strain analy?sis is the key to understand and predict failure behavior of a crossing.By taking into account non?linear material properties a three dimensional elastic?plastic finite element model which is composed of wheel bainite steel crossing and ties is presented.The stress and strain distribution in a bainite steel crossing is plotted under the contact wheel load.The effect of the strength match of nose rail and wing rail on stress/ strain is also discussed.The influence of the wheel load cycles on the maximum residual stress and maximum plastic strain are investigated. The established computational model and results could provide mechanical reference for strength check and failure analysis of a bainite steel crossing.