摘要
研究了各向异性和偏轴加载对轧制1050车轮钢疲劳性能的影响,获得试样在2种特定加载条件下的疲劳极限,运用SEM观察疲劳断口形貌,并利用有限元分析软件Ansys对0°、30°、45°3个不同偏轴加载角度的试样进行静力学分析。结果表明:随着试样与轧制方向角度的增加,疲劳极限逐渐降低,0°到45°下降比例约为9%;随着试样偏轴加载角度的增加,疲劳极限亦逐渐降低,0°到45°下降比例约为85%;在偏轴加载的情况下,试样承受的剪切应力与Von Mises等效应力较大,且随着偏轴加载角度的增加而增加。
Wheel is one of the key components of a train to transmit power and affect the security operation. With the rapidly development of high-speed railway, rolling contact fatigue of railway wheels has become an important issue with respect to failure. With the increasing of train speeds and axle loads,the wheel-rail dynamic stress and contact stress were increased, resulting in wheel out of round with offaxis wear and potential for derailment. SAE 1050 steel as a typical wheel steel is widely used in highspeed wheel and wagon wheel. Consequently, the wheel rolling contact fatigue performance under service process and the fatigue performance of wheel steel materials have been studied. However, there are less relevant results about the anisotropy of rolling and off-axis loading of wheel steel materials. To investigate the effect of anisotropy and off-axis loading on fatigue property of 1050 wheel steel, uniaxial fatigue tests were conducted at the conditions of 120 Hz and stress ratio R=0.1, and off-axis fatigue tests were conducted at the conditions of 55 Hz and R=0.1 at room temperature in air. All fatigue specimens were cut from bar round with the angles（0°, 30° and 45°） to rolling direction. The fatigue limit of specimens under two kinds of special loading conditions was obtained. Fracture surface of the specimen was observed by SEM. The finite element（FEM） analysis software（Ansys 14.0） was used to analyze static mechanicsof specimens under three different off-axis loading angles（0°, 30° and 45°）. The results showed that the fatigue limit decreased with increasing angle to rolling direction and the percentage of decline was 9%.The fatigue limit decreased with increasing off-axis loading angle and the percentage of decline was 85%. The shear stress and Von Mises stress were larger and increased with increasing off-axis loading angle when the specimen was subjected to off-axis loading.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2017年第3期307-315,共9页
Acta Metallurgica Sinica
基金
西南交通大学2015年研究生创新实验实践项目No.YC201509102~~
