内燃机滑动轴承气蚀损伤破坏过程

用MSC．Marc大型非线性有限元分析软件建立了轴瓦气蚀损伤模型，基于损伤力学理论对气蚀发生过程中气泡渍灭产生的微射流对轴瓦表面材料的力学作用过程进行了数值分析．结果表明：随时间增加，等效塑性应变和损伤量基本上为逐渐增大的趋势；轴瓦表面和接近表面的损伤量较大，越接近摩擦层和镍栅层的结合面附近损伤量越小．采用本方法可以有效计算轴瓦材料受微射流冲击载荷作用时的应变过程和损伤演变，由此提出了一种分析轴瓦表面气蚀磨损的损伤力学方法．

The Cavitation Erosion Damage Process of Dynamically Loaded Journal Bearings

The cavitation damage model was built using finite element analysis software MSC. Marc. This paper attempted to numerically analyze the action process based on damage mechanics when jet created by bubble collapse acted on the bearing surface in the process of cavitation erosion. The numerical results show that the values of equivalent plastic strain and void volume fraction increase with time. The values of damage scalar are higher on the beating surface and sub-surface, and decrease when it approaches the interface of overlay and nickel layer. The strain history and damage evolvement of bearing material acted by jet impact load can be calculated efficiently using the proposed method, which developes a new method of analyzing cavitation erosion failure of bearing surface.