The tensile properties of the welded hollow spherical joints with double plates were investigated in this paper,and the failure mechanism was revealed and the main factors affecting the bearing capacity were discussed.The axial tensile ultimate bearing capacity of eight welded hollow spherical joints with double plates was tested,and the parametric numerical analysis of the joints was carried out using the finite element analysis software ABAQUS,focusing on the influence of geometrical dimensions of the joints on their bearing capacity.The failure modes of welding hollow spherical joints with double plates under axial tension can be divided into two categories:cracking failure of hollow spherical joints and failure of welds at the joint between plates and hollow spheres.Additionally,joints,and partial peeling of the spherical surfaces was also observed in some joints.The stress concentration is obvious at the end of the connection between the hollow sphere and the plate.With the increase of the load,the joint between the hollow sphere and the plate gradually enters the yield stage along the radial direction.The axial tensile ultimate bearing capacity of the joint is positively correlated with the diameter of the hollow sphere,the ratio of the width of the plate to the outer diameter of the sphere,the ratio of the plate thickness to the sphere wall thickness,and negatively correlated with the ratio of the hollow sphere diameter to wall thickness to the thickness of the plate.Among the above factors,the ratio of hollow sphere wall thickness to plate thickness has relatively minimal influence on the bearing capacity.
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