钢丝绳三维接触模型及丝间应力分布研究

Research on Three-dimensional Contact Model and Stress Distribution between Wires of Steel Strand

建立了1×19IWS钢丝绳三维接触模型,该模型采用Splitting-pinball算法进行接触位置搜索,采用Augmented-Lagrangian算法进行接触载荷计算。对模型施加拉伸载荷,应用有限元进行了计算。分析计算结果,得出了钢丝沿轴线方向及在钢丝横截面内的应力分布规律;对照摩擦因数分别取0.10、0.11、0.12时的计算结果,得出摩擦因数对钢丝应力的影响规律,摩擦因数对钢丝切应力影响显著。分析了5个不同捻距倍数的钢丝绳计算结果,得出了捻距倍数对钢丝应力的影响规律,钢丝vonMises应力随捻距倍数增大而增大,但增大不明显,钢丝切应力随捻距倍数增大而减小,且在捻距倍数较小时变化幅度较大。进行了钢丝绳拉伸变形试验,试验结果与计算结果一致,说明所选用的模型是合理的。

A three-dimensional contact model of 1×19IWS steel strand was established.Contact point was searched by Splitting-pinball algorithm,Augmented-Lagrangian algorithm was applied for analysis of contact loads.The exerted tensile loads to the model was analyzed using FEM.After analysis of calculation results,the laws of steel wire stress distribution in axis direction and in its cross section were found.Friction coefficients were set as 0.10,0.11 and 0.12 respectively to obtain the influence law of friction coefficient on steel wire stresses.Research result show that friction coefficient has significant influence on the shear stress of steel wire.The calculation results of steel strand with five different lay pitch multiples were analyzed and the influence law of lay pitch multiple on the stresses of steel wire in steel strand was obtained.The Von Mises stress of steel wire increases following with lay pitch multiples,but the increment value is not very prominent.The shear stress of steel wire decreases following with the increase of lay pitch multiple,the changing amplitude is large when lay pitch multiple is small.Finally,a steel strand tensile deformation test was carried out and the consistency of test results with the calculation results shows that the selected model is reasonable.