Axisymmetrical Stress and Strength Analysis of Epoxy-Steel Composite Cylinders under Torsional Loads

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Epoxy-Steel composites have been used widely for lightening and strengthening mechanical structures. This paper deals with the stress analysis and strength estimation of epoxy-steel composite joint in which a hollow cylinder (epoxy) is fitted at the outside surface of a solid cylinder (steel) subjected to torsional loads. The interface stress distributions in the epoxy-steel composite cylinders under external torsion are analyzed using an axisymmetrical theory of elasticity as a two-body contact problem. In the numerical calculations, the effects of Young’s modulus and the diameter of the solid cylinder on the interface stress distributions are examined. It is found that the shear stress increases as Young’s modulus and the diameter of the solid cylinder decrease. A valid method for estimating the singularity is proposed. Using the interface stress distributions and analogous tests, the joint strength is predicted. In addition, the values of the joint strength were obtained experimentally. It is seen that a rupture initiates from the upper edge of the interface area when the torsion is applied to the upper end of the solid cylinder. For verification of the present analysis, FEM calculations are carried out. The numerical results are in fairly good agreements with the experimental results and the FEM results.