Abstract In this work we performed a structural integrity assessment of a riser pipe made of a material with a novel application, the API 5CT P110 steel, with superficial semi-elliptical cracks in the longitudinal position. The behavior of different crack size on a pipe under specific boundary conditions and pressure loads was studied. With the Finite Element Method, the Stress Intensity Factors along the crack front were obtained and compared with the Stress Intensity Factors calculate by the analytical approach of BS 7910:2013 standard. Afterwards, the fracture toughness of API 5CT P110 steel was obtained through CTOD tests to plot a specific Failure Assessment Diagram according the Option 1 of BS 7910:2013, in order to determine the acceptability of the cracks. The critical crack depths in the studied conditions were 14.2 mm according to the analytical approach of BS 7910:2013 standard and 15.5 mm according to FEM analysis.

中文翻译：

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根据 BS 7910:2013 标准对 5CT P110 钢立管进行结构完整性评估

摘要 在这项工作中，我们对立管进行了结构完整性评估，该立管由具有新用途的材料 API 5CT P110 钢制成，在纵向位置具有表面半椭圆裂纹。研究了在特定边界条件和压力载荷下管道上不同裂纹尺寸的行为。使用有限元方法，获得沿裂纹前沿的应力强度因子，并与通过 BS 7910:2013 标准的分析方法计算的应力强度因子进行比较。之后，通过CTOD试验得到API 5CT P110钢的断裂韧性，根据BS 7910:2013的Option 1绘制具体的失效评估图，以确定裂纹的可接受性。研究条件下的临界裂纹深度为 14。