组合载荷下新型高强度电缆力学行为研究

Study on Mechanical Behavior of New Type of High Strength Cables Under Combined Load

提出一种多层、纤维、树脂复合空心管结构的新型高强度电缆。基于复合材料细观力学,建立高强度电缆理论模型;同时,采用水平拉伸试验对比验证了理论方法的适用性;最后利用理论及数值方法对组合载荷下的电缆进行应力应变分析。结果表明,数值分析中不同边界约束条件对电缆分析结果影响较小(相对误差约3.12%);悬挂质量对电缆轴向延伸率、径向收缩及轴向扭转角影响较大;内压对电缆轴向延伸率和轴向扭转角影响较小,但每增加5 MPa相对径向收缩达12.32%;选取小角度缠绕方案能提高电缆拉伸刚度,但缆体各层之间会存在应力波动,导致内部的不稳定性;该高强度电缆满足悬挂质量10t、内压15 MPa的常规工况生产要求。

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 5MPa 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 tand an internal pressure of 15 MPa.