温度-腐蚀面积耦合作用下矿用圆环链冲击特性

为研究温度与腐蚀面积对圆环链冲击特性的影响,建立圆环链腐蚀模型,利用ABAQUS有限元分析软件对圆环链不同区域(Ⅰ区、Ⅱ区、Ⅲ区)在不同温度、不同腐蚀面积及温度-腐蚀面积耦合作用下的重载启动过程进行仿真研究,并提取启动过程中的冲击特性稳态值,利用MATLAB拟合得到冲击特性与温度及腐蚀面积的关系,并进行实验验证。结果表明:23MnNiCrMo54钢屈服强度随温度升高而下降,重载启动过程中,腐蚀位置位于Ⅲ区的腐蚀链环的最大稳态应力明显高于Ⅰ区、Ⅱ区,且均由较大面积达到屈服状态,并得到不同冲击特性(稳态应力、稳态摩擦耗散能、塑性耗散能、稳态内能)与温度及腐蚀面积的关系函数。

Impact characteristics of high tensile steel chains for mining under the temperature corrosion area coupling effect

In order to study the impact characteristics of the ring chain effected by temperature and corrosion area,a chain model was built to simulate the heavy load launching process of different regions on corroded chain under diverse conditions including different temperatures,different corrosion areas,and temperature corrosion areas coupling via ABAQUS,and extract the stable values of the impact characteristics.The coherence functions between impact characteristics and temperature,impact characteristic and corrosion density were fitted by MATLAB,and also proved by experimental verifications simultaneously.The results showed that the yield strength of the 23MnNiCrMo54 steel decreased with the temperature increase.In the process of heavy load launching,the maximum stable stress in the corrosion area No.Ⅲ was higher than that in other areas,and reached a yield state from a larger area.The model fitting by diverse impact characteristics (stable stress,stable friction dissipative energy,plastic dissipative energy,stable intrinsic energy) and temperature and corrosion area coupling was obtained.This method provide a significant parameter basis for forecasting the service life and optimizing the design of the ring chain.