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STRAIN-BASED DESIGN METHODS FOR COMPOSITE REPAIR SYSTEMS

机译：基于应变的复合修复系统的设计方法

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Composite materials are commonly used to repair corroded and mechanically-damaged pipelines. Most of these repairs are made on straight sections of pipe. However, from time to time repairs on complex geometries such as elbows, tees, and field bends are required. Conventional design methods for determining the amount of required composite materials are not conducive for these types of repairs. Over the past several years, the author has developed a methodology for assessing the level of reinforcement provided by composite materials to damaged pipelines using finite element methods. Instead of stress as the design basis metric, the method employs a strain-based design criteria that is ideally-suited for evaluating the level of reinforcement provided to non-standard pipe geometries. The finite element work has been validated using experimental methods that employed strain gages placed beneath the composite repair to quantify the level of reinforcement provided by the repair. This paper provides a detailed description of the strain-based design method along with appropriate design margins for both the reinforced steel and long-term performance of the composite materials.
机译：复合材料通常用于修复腐蚀和机械损坏的管道。这些维修中的大部分都是在管道的直线部分上制作的。然而，需要在需要修复诸如肘部，发球区域和野外弯曲的复杂几何形状上。用于确定所需复合材料量的常规设计方法不利于这些类型的维修。在过去几年中，作者制定了一种用于评估复合材料提供的加固水平，使用有限元方法对损坏管道提供的钢筋水平。该方法代替压力作为设计基础度量，该方法采用基于应变的设计标准，理想地适合评估提供给非标准管几何形状的加强水平。使用实验方法验证了有限元的工作，该实验方法采用了置于复合材料修复下方的应变计，以量化修复提供的钢筋水平。本文提供了基于应变的设计方法的详细描述，以及适当的设计边缘，用于复合材料的增强钢和长期性能。

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