摘要
为了探究协调接触条件下材料的微动疲劳失效机理,针对亚共晶铝硅合金ZL702A,使用有限元法建立了协调接触微动分析非线性模型,研究了试验条件下微动面的应力响应特征、断裂位置以及轴向载荷、法向载荷等因素对微动滑移量的影响,使用微动综合参数进一步验证了裂纹的萌生位置。结果表明:对于协调接触微动疲劳情形,微动表面并不一定必然存在微动滑移区,可能处于完全粘着状态,接触状态与轴向疲劳载荷、法向压力均有关系,微动滑移量几乎总是随轴向疲劳载荷的增加而增加,法向接触载荷越大,最大滑移量越小;如果存在微动滑移区,试件断裂位置处于粘滑过渡区;如果微动面处于完全粘着微动状态,试件断裂的位置处于压头与试件的接触边缘。
In order to explore the fretting fatigue failure mechanism of materials under coordinated contact conditions. For the hypoeutectic Al-Si alloy ZL702 A, a nonlinear model of coordinated contact fretting analysis was established using the finite element method. The influence of the stress response characteristics of the fretting surface, the fracture position, the axial load, the normal load and other factors on the fretting slip under the experimental conditions were studied. The fretting comprehensive parameters were used to further verify the crack initiation position. The results show that for the coordinated contact fretting fatigue, the fretting surface does not necessarily have a fretting slip zone, and may be in a completely adhered state. The contact state is related to the axial fatigue load and the normal pressure. The amount of fretting slip almost always increases with the increase of the axial fatigue load. The larger the normal contact load, the smaller the maximum slip. If there is a fretting slip zone, the fracture position of the specimen is in the stick-slip transition zone. If the fretting surface is fully adhered to the fretting state, the fracture position of the test piece is at the contact edge of the indenter and the test piece.
作者
王军
刘勇
WANG Jun;LIU Yong(School of Energy and Power Engineering,North University of China,Taiyuan 030051,China)
出处
《机械工程与自动化》
2020年第5期1-3,6,共4页
Mechanical Engineering & Automation
基金
山西省自然科学基金资助项目(20190D111131)。
关键词
协调接触
微动疲劳
微动面
应力分布
裂纹萌生位置
conforming contact
fretting fatigue
fretting surface
stress field
crack initiation location
