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.
Uniaxial tension testSpecimen, loading and measuring systems. The specimen and its installed state on a MTS810 Material Test Machine are shown in Fig. 1. The specimen is a wedge-ring connection structure
For soils, failure occurs with lower deviatoric stress under the same pressure (the first invariant of stress tensor) in TXE compared with the strength of the triaxial compression, which is indicated that the strength of soils strongly depends on the third invariant of stress deviator; Although in the traditional Mohr-Coulomb criterion it can be reflected in difference of strength between triaxial extension and compression under the same pressure, it’s nothing to do with the pressure for the strength ratio between triaxial extension and compression. By TXC and TXE, changes of deviatoric stress and the ratio with the pressure were studied
Cylindrical shell is a kind of common used structure in engineering. Interest in the
response of cylindrical shells to local impact loading has increased over the last few years. A
structure always endures working load more or less. For a cylindrical shell, the working load
commonly is internally pressure. In this paper, a numeral simulation of wedge block impact
internally Pressured cylindrical shell was carried out. The dynamic failure process of the structure
was obtained. The consistency between experimental observation and numerical simulation is
satisfactory.
For a mouth shaped strucure with bolt connection, the mechanical response and thread stress distribution were studied by experimental and numerical method. The structure was tested with variety of the pretension loads from 10 N.m to 70 N.m . In this paper, a numerical method modeling the helical thread was proposed. In the method, the structure was divided into three regions, thread region, conventional region and transition region. The conventional region was modeled with the conventional method, however, the thread region and the transition region were modeled using the Glide-Guide method. Firstly, two helical lines and the plane elements were created. Secondly, the plane elements were rotated along the lines, then the three dimensional elements for the helical model were obtained. Finally, the nodes of the transition region elements and the conventional region elements were merged so that the whole model was attained. The experimental structure was modeled by the method, and the mechanical response and thread stress distribution were obtained. The results show that the axial stress of the screw obtained by experiment and the numerical method were very close, and they were both close to the empirical formula when the equivalent friction coefficient was 0.22 . Comparing to the existing methods, the numerical method proposed in the article is mush simpler, and it can obtain reasonable results using all standard elements.
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