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为了掌握提升钢丝绳内部钢丝在波动载荷下的应力状态变化,针对典型钢丝绳6×7+IWS,推导轴向载荷下螺旋钢丝螺旋角变化量的显式表达式,给出钢丝绳侧股双螺旋钢丝的曲率、挠率和应力波动表达式。分析结果表明,钢丝绳在轴向载荷下,同向和交互捻制的钢丝绳中螺旋钢丝的螺旋角随载荷线性增加,其侧股螺旋钢丝的曲率和挠率随自身旋转角的变化呈360°周期变化;靠近独立股外侧时钢丝的曲率最大,而其挠率则最小,侧股内侧则相反;同向捻制钢丝绳侧股螺旋钢丝的曲率及其波动载荷下弯曲应力变化幅度远大于交互捻制钢丝绳。
In order to grasp the change of stress state of hoisting steel wire under fluctuating load, an explicit expression for the variation of helix angle of helical wire under axial load is deduced for a typical wire rope 6 × 7 + IWS. Curvature, Torsion, and Stress Fluctuation Expressions. The analysis results show that the helical angle of the helical wire in the same-direction and interlaced wire rope increases linearly with the load under the axial load. The curvature and torsion of the side-helix wire vary with the rotation angle of the helical wire 360 ° The curvature of the wire near the side of the independent strand is the largest while the deflection of the wire is the smallest while the inner side of the side strand is opposite. The curvature and the bending stress under the fluctuating load of the same direction twist wire are much larger than that of the alternating twisting Wire rope.