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Nonlinear Modeling of Cables with Flexural Stiffness

机译:弯曲刚度电缆的非线性建模

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摘要

A geometrically exact formulation of cables suffering axis stretching and flexural curvature is presented. The dynamical formulation is based on nonlinearly viscoelastic constitutive laws for the tension and bending moment with the additional constitutive nonlinearity accounting for the no-compression condition. A continuation method, combined with a mixed finite-difference spatial discretization, is then employed to path-follow the static responses of cables subject to forces or support displacements. These computations, conducted in the quasistatic regime, are based on cables with linearly elastic material behaviors, whereas the nonlinearity is in the geometric stiffness terms and the no-compression behavior. The finite-difference results have been confirmed employing a weak formulation based on quadratic Lagrangian finite elements. The influence of the flexural stiffness on the nonlinear static responses is assessed comparing the results with those obtained for purely extensible cables. The properties of the frequencies of the linear normal modes of cables with flexural stiffness are also investigated and compared with those of purely extensible cables.
机译:介绍了电缆的几何精确配方,电缆遭受轴拉伸和弯曲曲率。动态制剂基于非线性粘弹性本构规定的张力和弯矩,具有额外的组成型非线性核算的无压缩条件。然后采用延续方法,结合混合有限差分空间离散化,以便路径跟随电缆受到力或支撑位移的静态响应。在Quasistatic制度中进行的这些计算基于具有线性弹性材料行为的电缆,而非线性是几何刚度术语和无压缩行为。已经证实了基于二次拉格朗日有限元的弱配方确认了有限差异结果。评估抗弯曲刚度对非线性静态响应的影响将结果与纯可伸长电缆获得的结果进行评估。还研究了具有弯曲刚度的电缆线性正常模式的频率的性能,并与纯粹可伸长电缆的电缆进行比较。

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