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Computational modeling of synthetic-fiber ropes.

机译：合成纤维绳的计算模型。

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摘要

The objective of this research is to develop a computational model to predict the response of synthetic-fiber ropes under both monotonic and cyclic loads. These types of ropes are believed to offer a better alternative to more traditional mooring systems for deepwater applications. Of particular interest for this study are the degradation of rope properties as a function of loading history and the effect of rope element failure on overall rope response.; A computational tool developed specifically for this research accounts for the change in rope properties as it deforms and the change in configuration of a rope cross-section due to the failure of individual rope components. The software includes both geometric and material nonlinearities, and it incorporates a damage index so the strength and stiffness degradation of the rope elements can be modeled. Following the failure of rope elements, the software considers the possibility that the failed rope elements can resume carrying their proportionate share of axial load as a result of frictional effects.; Using the computational model developed under this research, several rope geometries are studied. Virgin (i.e., undamaged) ropes and initially damaged ropes are considered. In all cases, experimental data for a monotonically increasing load are available for comparison with the analytical predictions. For most of the cases analyzed, the proposed numerical model accurately predicts the capacity of the damaged ropes, but the model overestimates the rope failure axial strain. A three-dimensional finite element analysis is performed for a particular rope geometry to validate some of the assumptions made to develop the proposed computational model.; If failed rope elements resume carrying their proportionate share of axial load, numerical simulations demonstrate the existence of strain localization around the failure region. Based on the damage model, damage localization occurs as well. This damage localization can cause the premature failure of rope elements and reduce the load capacity and failure axial strain of a damaged rope.; Possible extensions to the computational model include the treatment of variability in rope properties and a lack of symmetry of the cross-section. Such enhancements can improve the accuracy with which damaged rope response is predicted. With the availability of validated software, engineers can reliably estimate the performance of synthetic-fiber moorings so that the use of these systems can be used with confidence in deepwater applications.
机译：这项研究的目的是建立一个计算模型，以预测合成纤维绳在单调和周期性载荷下的响应。据信，这些类型的绳索可为深水应用提供更传统的系泊系统的更好替代方案。这项研究特别令人感兴趣的是绳索特性随载荷历史的下降以及绳索元件失效对绳索整体响应的影响。专为这项研究开发的计算工具解决了绳索变形时绳索特性的变化以及由于单个绳索组件的故障而导致的绳索横截面构型的变化。该软件同时包括几何和材料非线性，并且结合了损伤指数，因此可以对绳索元素的强度和刚度退化进行建模。绳索元件失效后，软件会考虑由于摩擦作用而导致失效的绳索元件可以继续承受一定比例的轴向载荷的可能性。使用本研究开发的计算模型，研究了几种绳索几何形状。考虑使用初生（即未损坏）绳索和最初损坏的绳索。在所有情况下，单调增加负载的实验数据都可与分析预测进行比较。对于大多数已分析的情况，提出的数值模型可以准确地预测损坏的绳索的承载能力，但是该模型高估了绳索破坏的轴向应变。对特定的绳索几何形状进行了三维有限元分析，以验证为开发建议的计算模型而做出的一些假设。如果失效的绳索元件恢复承受其按比例分配的轴向载荷，则数值模拟将表明在失效区域附近存在应变局部化。基于损伤模型，也会发生损伤局部化。这种损坏的定位会导致绳索元件过早损坏，并降低受损绳索的承载能力和轴向失效应变。对计算模型的可能扩展包括处理绳索属性的可变性和缺乏对称的横截面。这样的增强可以提高预测损坏的绳索响应的准确性。借助经过验证的软件，工程师可以可靠地估算合成纤维系泊设备的性能，从而可以在深水应用中放心使用这些系统。

著录项

  • 作者

    Beltran, Juan Felipe.;

  • 作者单位

    The University of Texas at Austin.;

  • 授予单位 The University of Texas at Austin.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 207 p.
  • 总页数 207
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

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