This research investigates the collapse mechanisms and crossover pressure capacity of carbon fiber-reinforced polymer (CFRP) buckle arrestors in subsea pipelines. A nonlinear three-dimensional finite element (FE) model was formulated using ANSYS framework, incorporating a nonlinear geometric algorithm to simulate the collapse and crossover failures. The study underscored a good agreement between the FE model predictions, experimental observations done by the author, and previous research outcomes. Two principal crossover modes; flattening and U-shape modes were identified, though initiated similarly, differ in progression, attributed to the arrestor's attributes. The arrestor thickness ratio (h/t) emerged as a significant determinant of arresting efficiency, particularly impactful when h/t ≥ 1.5. An inverse relationship between σ_yp/σ_uc and P_X/P_P was identified. Furthermore, specific geometric parameters, like h/t and L/D, delineate the predominant crossover mode. Finally, new empirical expressions including the geometric and material parameters are proposed to predict the crossover pressure (P_X) for each crossover mode, separately. Also, the findings suggest that CFRP arrestors, especially those with configurations of L = 1.5D and h = 3t, can offer optimum resilience to external pressure.

本研究研究了海底管道中碳纤维增强聚合物 (CFRP) 扣扣避雷器的塌陷机制和交叉压力能力。利用ANSYS框架建立了非线性三维有限元（FE）模型，结合非线性几何算法来模拟倒塌和交叉失效。该研究强调了有限元模型预测、作者所做的实验观察和先前的研究成果之间的良好一致性。两种主要的交叉模式；扁平化和 U 形模式已被识别，尽管起始方式相似，但进展情况不同，这归因于避雷器的属性。阻火器厚度比 ( h/t ) 是阻火效率的重要决定因素，当h/t  ≥ 1.5 时影响尤其大。确定了σ _yp /σ _uc和P _X /P _P之间的反比关系。此外，特定的几何参数，如h/t和L/D，描述了主要的交叉模式。最后，提出了包括几何和材料参数的新经验表达式，以分别预测每种交叉模式的交叉压力（P _X）。此外，研究结果表明，CFRP 避雷器，尤其是那些L  = 1.5 D和h  = 3 t配置的避雷器，可以提供最佳的外部压力弹性。