Study on Mechanical Behaviors of Wedge-Ring Connection Structure with Deformable Contact under Uniaxial Tension Load

摘要

In this paper, the distribution characteristics of deformation of and stress in a wedge-ring connection structure are studied by experiments and FE numerical simulations. In the established FE model, all contact surfaces are of deformable and frictional contact relations. A few uniaxial tension experiments are implemented on a MTS810 Material Test Machine. The strains are recorded using resistance strain gages, the in-surface displacements and off-surface displacements are measured using laser holography, and the load vs. total displacement curve is recorded by the measuring system of the MTS810. The experiment and FE numerical calculations indicate that the quasi-symmetric property of the wedge-ring connection structure causes asymmetric deformation. The larger the axial loads and the related structural deformations are, the lager the offset angle of the sequential load direction away from the initial axis, which implies that the structure simultaneously endures axial tension loads and transverse bending loads that increase continuously. When the external loads approach a certain critical value, the radial dislocations between the components of the structure result in a jumping displacement response. The theoretical results calculated by FEM are well fitted with those obtained by experiments.