基于ANSYS的KKT型相贯节点承载力性能研究

针对空间管节点几何形式很多、受力复杂、影响节点承载力性能的因素也比较多等问题，对实际工程中常见的空 间KKT型相贯节点的极限承载力性能进行了研究。基于数值仿真，主要采用ANSYS软件对空间KKT型圆管相贯节点 进行了非线性有限元分析，揭示了节点的承载力性能和破坏模式；着重分析和总结了重要几何参数对节点极限承载力的 影响；将此类节点的极限承载力分析结果与规范中T型、K型节点承载力计算公式进行比较分析。研究结果表明，节点 的破坏模式大多属于主管管壁塑性破坏；T型支管与主管外径比卢，、K型腹管与主管外径比p2、主管径厚比γ对节点极 限承载力有主要影响；KKT型相贯节点的极限承栽力计算公式与T型、K型节点承载力设计公式有些必然的联系。

Structure Design and Magnetic Attraction Force Simulation of a Climbing Robot for Spherical Tank Grinding

Multi-planar tubular joints have problems of various geometric forms, complicated loads. and many factors which influence the bearing capacity of the joints. For these problems. the bearing capacity of common multi-planar KKT-joints was discussed in practical engineering. Based on numerical simulation. nonlinear finite element analysis was mainly used in the ultimate strength on multi-planar KKT-joints by ANSYS. The bearing capacities and the failure modes were demonstrated. And then the influences of some important geometric parameters on the ultimate strength were analyzed and summarized. Based on the design formulas of the bearing capacities on T-joints and K-joints of the code. the computational formula of the ultimate bearing capacity on multi-planar KKT-joints was discussed. The results show that the failure modes mostly belong to plastic failure of the walls of the chord. The diameter ratio P, of T-branch to the chord. the diameter ratio p2 0f T-branch to the chord and the diameter-thickness ratio y of the chord have major influences on the bearing capacity of the joints. The computational formula of the bearing capacity on KKT-joints has some positive connections with the design formulas of the bearing capacities on T-joints and K-joints.