销轴滑动磨损条件下的极限承载力研究

Ultimate Load Carrying Capacity under Sliding Wear Conditions of Pins

目的针对销轴在海洋环境下由于轴向滑动磨损造成的极限承载力变化进行数值模拟研究,得到销轴的极限承载力演变规律,为水下磨损结构的安全评估提供理论依据。方法首先,运用ANSYS有限元分析软件,建立“柱-瓦”模型进行磨损计算,对滑动磨损方法进行验证。然后,建立实际销轴与锚链横档局部有限元模型,进行磨损分析,得到不同轴向滑动频率下的磨损数据。最后,计算销轴在失效准则下不同磨损深度等级(0、1、2、3 mm)的极限承载力,并根据磨损速度-磨损深度-破断力的映射关系得到其许用极限承载力和累计使用时间随磨损深度的变化曲线。结果在典型工况(滑动频率为3 Hz)条件下,销轴连续工作约3298 h,磨损深度可达3 mm,许用极限承载力下降14180 N。结论随着销轴轴向滑动频率的增加,销轴的最大磨损深度、总磨损体积、磨损速度均近似呈线性增长变化。在典型工况下,销轴许用极限承载力随着服役时间增长近似呈线性下降,且随着时间增加许用极限承载力下降趋势变缓。

The work aims to conduct a numerical simulation study to investigate the change of ultimate load carrying capac-ity of the pin due to axial sliding wear in the marine environment,and to obtain the evolution of the ultimate load carrying ca-pacity of the pin,so as to provide a theoretical basis for the safety assessment of the underwater wear structure.Firstly,ANSYS finite element analysis software was used to establish a"column-tile"model for wear calculation to verify the sliding wear method;Then,a local finite element model of the actual pin and the anchor chain cross-file was established for wear analysis to obtain wear data under different axial sliding frequencies;Finally,the ultimate load carrying capacity of the pin under different wear depth(0/1/2/3 mm)was calculated,and its permissible ultimate load carrying capacity and the variation curve of cumula-tive use time with wear depth were obtained according to the mapping relationship of wear speed-wear depth-breakage force.Under typical operating conditions(sliding frequency of 3 Hz),the wear depth of the pin was up to 3 mm for about 3298 h,and the allowable ultimate load carrying capacity decreased by 14180 N.With the increase of the axial sliding frequency of the pin,the maximum wear depth,the total wear volume and the wear speed of the pin increase approximately linearly.Under typical operating conditions,the allowable ultimate load carrying capacity of the pin decreases linearly with the increase of service time,and the decreasing trend of the allowable ultimate load carrying capacity becomes slower with the increase of time.