Pipelines must have good mechanical properties during their service life. To improve this lifetime, a protection against corrosion is applied on the steel cylinder by coupling a passive coating with an active cathodic protection. Otherwise, it is well known that the presence of internal stresses in organic coatings is a current phenomenon which can result in the loss of adhesion. These phenomena can be critical for safety and lead to expensive maintenance operations. In order to identify areas of overstress and estimate the values reached in the pipeline, and especially in its coating, the development of numerical models appears relevant.

The models show that significant stresses are present in the coating and at the different interfaces during the pipeline operation. Their values change with the different loading cases which can be encountered on the transportation network. From these results, the stress is essentially concentrated in the steel/coating interface with a maximal value lower than 10 MPa.

管道在使用寿命期间必须具有良好的机械性能。为了延长使用寿命，通过将被动涂层与主动阴极保护装置结合在一起，可在钢瓶上施加防腐蚀保护。否则，众所周知，有机涂层中内部应力的存在是目前的现象，会导致粘附力下降。这些现象对于安全至关重要，并导致昂贵的维护操作。为了确定过应力区域并估计管道中，特别是在管道中所达到的值，数值模型的开发显得很重要。

这些模型表明，在管道运行期间，涂层中以及不同界面处都存在明显的应力。它们的值随运输网络上可能遇到的不同装载情况而变化。根据这些结果，应力基本上集中在钢/涂层界面中，最大值低于10 MPa。