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Spatially complex localization in twisted elastic rods constrained to lie in the plane

机译:受约束位于平面内的扭曲弹性杆的空间复杂定位

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Equilibrium configurations are considered of a long rod constrained to lie in a plane subject to end conditions constituting a wrench. Using the Costar theory, a formulation of the problem is proposed using a reduced angular description of the director basis. On the assumption of an isotropic cross-section, it is found that flexure and torsion decouple so that the rod buckles like a planar elastic. For rods held under gravity, a condition is derived for the applied end loads required for lift-off of the localized mode under tension. For anisotropy rods, flexure and torsion are coupled and additional more complex equilibrium shapes are possible including multi-loop localized modes. Using specially adapted numerical shooting techniques such solutions, which are mathematically represented by homoclinic orbits to a periodic solution, are computed, and conditions for lift-off of the single-loop solutions are calculated as a function of the applied loads and an anisotropy parameter.
机译:考虑到长杆的平衡构造,该长杆受约束地位于受制于扳手的端部条件的平面内。使用Costar理论,使用减少的矢向角描述来提出问题的提法。在各向同性横截面的假设下,发现弯曲和扭转会解耦,从而使杆像平面弹性体一样弯曲。对于在重力作用下保持的杆,导出了在张力下抬升局部模式所需的施加的最终载荷的条件。对于各向异性的杆,挠曲和扭转是耦合的,另外可能更复杂的平衡形状包括多环局部模式。使用经过特殊调整的数值射击技术,可以计算出这些解决方案,这些解决方案在数学上由同宿轨道表示为周期解,并且根据所施加的载荷和各向异性参数来计算单环解的提升条件。

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