Abstract Subsea steel pipes are often used to form extensive networks for transporting oil and gas over large distances. Such pipes can be subjected to actions characterised by high loading rates and intensities stemming from high-mass low-velocity collisions. To ensure that such networks continue to operate, even after being subjected to impact loads, it is essential that the behaviour of the pipes is characterised by a certain level of resilience. Considering that most of the available data obtained from drop-weight tests on steel pipe specimens does not provide a detailed description of the behaviour exhibited throughout the loading process, the work herein aims at investigating numerically, via dynamic nonlinear finite element analysis, the problem at hand. After validating the predictions obtained against the available test data, the numerical investigation focuses on studying the effect of a range of parameters on the exhibited behaviour. The latter parameters are associated with the shape and mass of the impacting object, the geometry and the support conditions of the pipe, the level of axial loading (applied along the axis of the pipe) as well as the level of internal and/or external pressures imposed onto the pipe walls. The numerical predictions reveal that the above parameters, most of which are associated with the in-situ conditions imposed onto subsea pipes throughout their operational life, can influence, potentially detrimentally, the exhibited behaviour. The numerical predictions obtained reveal that this effect is not accurately captured by the existing assessment methods employed in practice for predicting the level of damage suffered by pipes during impact.

中文翻译：

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影响钢管在冲击载荷下性能的参数

摘要 海底钢管常用于形成广泛的网络，用于远距离输送石油和天然气。此类管道可能会承受由大质量低速碰撞引起的高负载率和强度的作用。为了确保此类网络即使在受到冲击载荷后仍能继续运行，管道的行为必须具有一定程度的弹性。考虑到从钢管试样落锤试验中获得的大多数可用数据并没有提供整个加载过程中表现出的行为的详细描述，本文的工作旨在通过动态非线性有限元分析数值研究在手。在根据可用测试数据验证获得的预测后，数值研究的重点是研究一系列参数对展示行为的影响。后面的参数与撞击物体的形状和质量、管道的几何形状和支撑条件、轴向载荷水平（沿管道轴线施加）以及内部和/或外部的水平有关。施加在管壁上的压力。数值预测表明，上述参数（其中大部分与海底管道在其整个使用寿命期间强加于其上的现场条件相关）可能会影响所表现出的行为，并可能产生不利影响。获得的数值预测表明，在实际中用于预测管道在冲击过程中遭受的损坏程度的现有评估方法并没有准确地捕捉到这种影响。