关键词: 高强度电缆, 细观力学, 组合载荷, 应变

Abstract: A new type of high-strength resin/fiber composite cables with hollow multilayered structure was proposed. The theoretical model of the high-strength cable was established based on the micro mechanics of composite materials and its applicability was further verified by a horizontal tensile test. Finally, the stress strain behavior of the cable was analyzed by using the theory and numerical methods. The results indicated that the effect of different boundary conditions on the analysis results was insignificant under a relative error of about 3.12 %. The axial elongation, radial contraction and axial torsion angle were greatly influenced by suspension mass, whereas the internal pressure exhibited few effects on the axial extension rate and axial twist angle. On the other hand, the relative growth rate of the radial deformation increased by 12.32 % with an each additional increase of 5 MPa in internal pressure. The use of small angle winding scheme can improve the tensile stiffness of the cable, but there was a stress fluctuation appearing between the layers of the cable, which leads to an internal instability. The high-strength cable can meet the requirements of production under the normal conditions with a suspension quality of 10 t and an internal pressure of 15 MPa.

Key words: high-strength cable, Micro mechanics, Combined loads, strain