截面变化对钢丝束标样电磁特性的影响

标样是钢丝绳电磁探伤方法评估中的关键部分，其配置是否合理直接关系到评估的有效性和可靠性。ASTME1571推荐使用钢丝束标样替代钢丝绳标样，但是该标准只给出了一般性的规定，对于钢丝在钢丝束中如何配置缺乏具体的描述。基于有限元方法建立钢丝束的电磁探伤模型，研究截面变化对平行钢丝束标样电磁检测特性的影响。首先改变钢丝在钢丝束中的分布，分析钢丝分布对磁场的影响；其次改变钢管壁厚，分析壁厚变化对磁场的影响。研究表明，钢丝分布和钢管的壁厚变化对钢丝束的磁场均会产生影响，在选择和配置钢丝束标样时需要考虑钢丝分布和钢管壁厚变化。

钢丝绳应力及股内钢丝变形的相关性研究

根据微分几何学理论分析钢丝绳股内钢丝的空间位置关系,利用ANSYS软件建立了6×7 IWS钢丝绳的几何模型。通过网格划分得到钢丝变形计算的有限元模型,以钢丝绳一端完全约束,另一端施加轴向力作为加载工况,确立模型求解的边界条件,并进行了钢丝受力变形的数值模拟,得出在此工况下股内各丝的轴向应力、剪应力及轴向变形的分布规律。研究了股内各钢丝受力变形规律,对照分析股内2根钢丝在接触位置各自的伸长量,通过求两丝变形差的方法求得出两丝的错动量。对照分析右同向捻及右交互捻钢丝绳股内钢丝应力及变形结果,研究捻向组合对股内钢丝所受应力及变形的影响,以及捻向组合对股内相接触2根钢丝的错动量的影响,得出了相关结论。

Influence of Fatigue Loading on the Residual Stress Distribution in Prestressing Steel Wires

This paper analyzes the influence of fatigue loading on the residual stress profile in high strength steel wires. To this end, different sinusoidal loads with diverse values of maximum loading level and number of cycles were simulated on wires in which several residual stress profiles had been previously introduced, some of them with a tensile state and others with a compressive state. An analysis was made of the evolution with time of such residual stress laws by comparing them at key instants of loading, that is, at initial instant, at maximum load, at minimum load and at final instant. Numerical results show only a minor influence of fatigue loading on the residual stress profile.