车用发动机
車用髮動機
차용발동궤
2014年
1期
1-6
,共6页
凸轮%挺柱%接触应力%摩擦因数%疲劳寿命
凸輪%挺柱%接觸應力%摩抆因數%疲勞壽命
철륜%정주%접촉응력%마찰인수%피로수명
cam%tappet%contact stress%friction coefficient%fatigue life
针对某柴油机配气机构凸轮-平底挺柱摩擦副,综合采用多体动力学方法、Hertz理论和有限元静力分析方法,确定凸轮桃尖附近为危险位置。针对此位置,采用Abaqus/Standard准静态分析方法,分析了表面摩擦因数对凸轮-挺柱的Von Mises等效应力、切应力的影响。结果表明,随着摩擦因数的增大,Von Mises应力和切应力逐渐增大,最大Von Mises应力的位置从表面下一点逐渐移向表面。最后基于修正的Manson-Coffin寿命预测方法,对挺柱在不同摩擦因数下不同深度处的接触疲劳寿命进行了估算。研究发现,随摩擦因数增大,接触疲劳寿命逐渐减小,接触疲劳裂纹萌生位置逐渐靠近表面。
針對某柴油機配氣機構凸輪-平底挺柱摩抆副,綜閤採用多體動力學方法、Hertz理論和有限元靜力分析方法,確定凸輪桃尖附近為危險位置。針對此位置,採用Abaqus/Standard準靜態分析方法,分析瞭錶麵摩抆因數對凸輪-挺柱的Von Mises等效應力、切應力的影響。結果錶明,隨著摩抆因數的增大,Von Mises應力和切應力逐漸增大,最大Von Mises應力的位置從錶麵下一點逐漸移嚮錶麵。最後基于脩正的Manson-Coffin壽命預測方法,對挺柱在不同摩抆因數下不同深度處的接觸疲勞壽命進行瞭估算。研究髮現,隨摩抆因數增大,接觸疲勞壽命逐漸減小,接觸疲勞裂紋萌生位置逐漸靠近錶麵。
침대모시유궤배기궤구철륜-평저정주마찰부,종합채용다체동역학방법、Hertz이론화유한원정력분석방법,학정철륜도첨부근위위험위치。침대차위치,채용Abaqus/Standard준정태분석방법,분석료표면마찰인수대철륜-정주적Von Mises등효응력、절응력적영향。결과표명,수착마찰인수적증대,Von Mises응력화절응력축점증대,최대Von Mises응력적위치종표면하일점축점이향표면。최후기우수정적Manson-Coffin수명예측방법,대정주재불동마찰인수하불동심도처적접촉피로수명진행료고산。연구발현,수마찰인수증대,접촉피로수명축점감소,접촉피로렬문맹생위치축점고근표면。
For the cam-tappet pair of valve train for a diesel engine ,the multi-body dynamics method ,Hertz theory and the fi-nite element static analysis method were used to determine the cam peach tip area as the damage position .With Abaqus/stand-ard quasi-static analysis method ,the influences of surface friction coefficients on Von Mises equivalent stress and shear stress were analyzed .The results show that Von Mises stress and shear stress increase and the maximal Von Mises stress position ex-tends to the surface from the below with the increase of friction coefficients .The tappet contact fatigue life estimation of differ-ent depths under different friction coefficients based on the modified Manson-Coffin life prediction method shows that the con-tact fatigue life decreases and the contact fatigue crack initiation approaches the surface gradually with the increase of friction coefficient .