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首页> 外文会议>Automotive Fuel Containment Conference 2000 May 26, 2000 Birmingham, UK >A Comparative Study of the Integrity of Joints Between Multilayer Fuel Line Constructions and Different Connector 'Barb' Designs
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A Comparative Study of the Integrity of Joints Between Multilayer Fuel Line Constructions and Different Connector 'Barb' Designs

机译：多层燃料管路结构与不同连接器“倒钩”设计之间的接头完整性比较研究

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With the advent of low evaporative emission requirements there has been the rapid adoption of multilayer extrusion technology into the production of Fuel and Vapour tubing used on Fuel systems on automobiles. Multilayer extrusion technology enables a manufacturer of Fuel and Vapour tubing to simultaneously co-extrude dissimilar thermoplastic materials in tubular form. This allows the manufacturer to combine expensive and brittle high performance evaporative emission 'barrier' polymers with lower cost engineering polymers. However, it is a well-known characteristic of these multilayer tube constructions that the joints between them and connector 'barbs' have lower joint integrity. Joint integrity is most often quantified by 'Pull-off and leakage tests. Recent developments in LEV-Ⅱ requirements for 2004 and beyond indicate that joint integrity will become a focus area for study and improvement. The authors set out to study by comparison the joint integrity of a number of different connector 'barb' designs in relation to monolayer 'flexible' Pal2 tubing (currently the industry standard) and two multilayer constructions. Comparative 'Pull-off' and leakage test data was obtained and a comparative study made of the effects of temperature on the 'Pull-off loads obtained. In addition a comparative study was made of the following in relation to the comparative test data: The dimensional differences between the different 'barb' designs. 1. The Burst Values of the different tubes - a measure of the 'Hoop Stress' applied by the tubes at the joints. 2. The Hardness of the different materials in contact at the joints. An explanation was made of the observed differences with recommendations for possible new areas for study.
机译：随着低蒸发排放要求的到来，多层挤出技术已迅速应用于汽车燃料系统中使用的燃料管和蒸汽管。多层挤出技术使燃料管和蒸气管的制造商能够同时共挤出管状的异种热塑性材料。这使制造商可以将昂贵且易碎的高性能蒸发排放“阻隔”聚合物与成本更低的工程聚合物结合起来。然而，这些多层管结构的众所周知的特征是它们与连接器“倒钩”之间的接头具有较低的接头完整性。接头完整性通常通过“拉拔和泄漏测试”来量化。 2004年及以后的LEV-Ⅱ要求的最新发展表明，关节的完整性将成为研究和改进的重点领域。作者着手研究与单层“柔性” Pal2管（当前为行业标准）和两种多层结构有关的多种不同连接器“倒钩”设计的接头完整性。获得了比较的“拉力”和泄漏测试数据，并对温度对“拉力”负载的影响进行了比较研究。此外，还对以下有关比较测试数据的内容进行了比较研究：不同“倒钩”设计之间的尺寸差异。 1.不同管的爆裂值-衡量管在接头处施加的“环向应力”的方法。 2.接头处接触的不同材料的硬度。对观察到的差异进行了解释，并提出了可能的新研究领域的建议。

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