具有内核伸出段的套管构件在线接触阶段的受力性能研究

Aiming at the axially compressed casing members with core extension section, the mechanical model of line contact stage is established. The formulas for calculating physical quantities such as shear force, bending moment, deflection, distributed contact force and concentrated contact force of core and sleeve are derived by using the theory of small deflection. Firstly, the correctness of the deduction of the related physical quantities is verified by a comparison example with the casing component without core extension section. Meanwhile, numerical example shows that the point contact will change to the line contact ahead of time due to the influence of the core extension section, which makes the axial bearing capacity of the casing member decrease remarkably, and the contact reaction force at the end and the shear force and bending moment of the core increase remarkably. Secondly, the mechanical properties of casing members with core extension section are analyzed. The analysis shows that the gap between core and sleeve has no effect on the line contact length, and the bending moment and shear force of core increase with the increase of the gap. With the increase of the length of core extension section, the line contact length and the bending moment and shear force of core also increase.