考虑铸钢材料不均匀性影响的索鞍受力性能有限元分析

Finite Element Analysis of Cable Saddle’s Mechanical Performance Considering the Influence of Cast Steel Material Inhomogeneity

为研究铸钢材料不均匀性对索鞍受力性能的影响,基于概率理论和有限元数值模拟技术,在ABAQUS平台上编制PYTHON材料随机模拟程序,建立了考虑铸钢材料不均匀性的随机有限元模型,深入探讨了索鞍在三向荷载作用下的复杂应力、塑性分布以及分析了铸钢材料不均匀性对索鞍极限承载力的影响规律。分析结果表明:网格尺寸的减小会导致承载力随机性增大,但对承载力的判定影响不大;铸钢材料的随机性会导致铸钢件应力分布不均匀,在设计荷载下局部区域进入塑性状态;材料屈服强度的不均匀性对结构承载力影响较大,而弹性模量的不均匀性对此影响较小;铸钢件材料不均匀性对索鞍的静力力学行为无明显影响,但会小幅度地降低结构承载力以及使结构在极限状态时出现更大的变形。

To study the influence of cast steel material non-uniformity on the mechanical performance of cable saddle,based on probability theory and finite element numerical simulation technology,a random simulation program of PYTHON material was compiled on the ABAQUS platform,and a random finite element model considering the cast steel material non-uniformity was established.The complex stress and plastic distribution of cable saddle under three-way load were discussed in depth,and the influence of cast steel material non-uniformity on the ultimate bearing capacity of cable saddle was analyzed.The results show that the reduction of grid size will lead to the increase of randomness of bearing capacity,but has little influence on the determination of bearing capacity.The randomness of steel casting materials will lead to uneven stress distribution of steel castings,and local areas will enter the plastic state under the design load.The non-uniformity of material yield strength has a great influence on the bearing capacity of the structure,while the non-uniformity of elastic modulus has a small influence on it.The material inhomogeneity of the steel casting has no obvious influence on the static mechanical behavior of the cable saddle,but it will reduce the bearing capacity of the structure slightly and make the structure appear greater deformation in the limit state.