On the Prediction of Long-Term Creep-Failure of GRP Pipes in Aqueous Environment

• Tipo: Artigo em Revista Científica Internacional
• Data: 2010

Autores

Rui Miranda Guedes (Autor) FEUP; Alcides Sa (Autor) Outra; Hugo Faria (Autor) Outra

Revista

Título: Polymer Composites

Vol. 31 Nº 6

Páginas: 1047-1055

ISSN: 0272-8397

Editora: Wiley-Blackwell

Indexação

ISI Web of Knowledge - 11 Citações

ISI Web of Science

Scopus - 16 Citações

COMPENDEX

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia dos materiais

Outras Informações

ID Authenticus: P-003-6GJ

DOI: 10.1002/pc.20891

Abstract (EN): The aim of this work was to study the long-term failure of GAP (Glass fiber-reinforced Polymer) pipes under the influence of moisture absorption. These pipes are used in water transportation, which has an important effect on the mechanical properties of the polymeric matrix. The GRP pipes are usually tested under ring deflection or internal pressure conditions. This study presents and analyzes experimental creep-rupture data obtained from standard test methods under ring deflection conditions. This loading configuration simulates in laboratory the conditions verified in a subsoil installation. The creep testing was carried out under constant dead weight on unconditioned and preconditioned samples in a submerged condition. The diametrical deflection of samples was measured periodically, and the time to failure of each sample was recorded. The main purpose of this work was to determine the short and long-term rupture energies of GRP pipes and assess the influence of moisture preconditioning on those values. The observed failure mode was always the same. It was concluded that the energy at failure decreases with time. The influence of the preconditioning on the creep-rupture of GAP pipes was considered negligible. Different time-dependent failure models were described and used for long-term extrapolation of the experimental data. The maximum strain at failure decreased about 12% from 0.1 to 1,000 hr of creep testing. Furthermore, data extrapolation to 50 years predicts a reduction of strength of about 60%, founded on the most conservative time-dependent failure criterion. POLYM. COMPOS., 31:1047-1055, 2010. (C) 2009 Society of Plastics Engineers

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Notas: DOI: 10.1002/pc.20891

Nº de páginas: 9