A Comparative Wet Collapse Buckling Study for the Carcass Layer of Flexible Pipes

Autor(es)

Gay Neto, Alfredo ^[1] ; Martins, Clovis de Arruda ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Mech Engn, BR-05508970 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING-TRANSACTIONS OF THE ASME; v. 134, n. 3 AUG 2012.
• Citações Web of Science: 27

Resumo

When there is a failure on the external sheath of a flexible pipe, a high value of hydrostatic pressure is transferred to its internal plastic layer and consequently to its interlocked carcass, leading to the possibility of collapse. The design of a flexible pipe must predict the maximum value of external pressure the carcass layer can be subjected to without collapse. This value depends on the initial ovalization due to manufacturing tolerances. To study that problem, two numerical finite element models were developed to simulate the behavior of the carcass subjected to external pressure, including the plastic behavior of the materials. The first one is a full 3D model and the second one is a 3D ring model, both composed by solid elements. An interesting conclusion is that both the models provide the same results. An analytical model using an equivalent thickness approach for the carcass layer was also constructed. A good correlation between analytical and numerical models was achieved for pre-collapse behavior but the collapse pressure value and post-collapse behavior were not well predicted by the analytical model. {[}DOI: 10.1115/1.4005185] (AU)

• Processo FAPESP: 06/06277-0 - Análise dinâmica linear e não-linear de cabos submersos
• Beneficiário: Alfredo Gay Neto
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto