Influence of service temperature on shear creep behaviour of a rigid low-density closed-cell PIR foam

• Autor(a) principal: Figueira, Diogo
• Data de Publicação: 2019
• Outros Autores: Sena-Cruz, José, Pereira, Eduardo, Valente, Isabel B., Barros, Joaquim A. O., Castro, Fernando, Soares, Delfim
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/1822/65188
• topic: Polymeric foams; Polyisocyanurate; Shear creep; Findley’s power law; Polyisocyanurate (PIR); Temperature; Engenharia e Tecnologia::Engenharia Civil; Science & Technology

An experimental campaign was carried out to assess shear creep behaviour of a rigid low-density closed-cell polyisocyanurate (PIR) foam. Two service temperature values were considered, 20 ºC and 30 ºC, and the applied stresses ranged between 20% and 60% of the corresponding shear strength. The results showed that a stress amplitude of 30% was enough to cause nonlinear creep response. Furthermore, creep deformations were slightly smaller in the tests at 30 ºC, a fact that matched the viscoelastic response of the PIR foam obtained from DMA testing. Finally, creep prediction curves were calibrated through an analytical approach based on the Findley’s power law.