Scrutinizing interlaminar fatigue loading cycle in composites using acoustic emission technique: Stress ratio influence on damage formation

Autor(es)

Motta Jr., Roberto Ferreira ; Alderliesten, Rene ; Shiino, Marcos Yutaka ; Cioffi, Maria Odila Hilario ; Voorwald, Herman Jacobus Cornelis

• Tipo de documento: Artigo Científico
• Fonte: COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING; v. 138, p. 11-pg., 2020-11-01.

Resumo

Current models for delamination propagation prediction in fiber-reinforced polymer (FRP) composites exhibit limitations to explain the physics underlying the mechanisms of damage formation in fatigue. In order to contribute in this field, this research focuses on the study of damage development within a single loading cycle of FRP double cantilever beam specimens under different stress ratios (R). The acoustic emission technique was used to investigate damage propagation. Results showed that under high R-ratios, the load cycle spends an increased time above the threshold energy (U-th). This time difference affects the damage distribution within a single loading cycle. Furthermore, the steady-state delamination propagation was influenced by the R-ratio variation due to the modification of the external work applied to the specimen. (AU)

• Processo FAPESP: 17/03698-0 - Correlação entre os mecanismos de dano de compósitos NCF e sinais acústicos
• Beneficiário: Roberto Ferreira Motta Junior
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Iniciação Científica
• Processo FAPESP: 19/00846-3 - Relação da extensão de dano interlaminar e variação da orientação de fibra com sinal acústico: carregamentos quase-estático e cíclico
• Beneficiário: Roberto Ferreira Motta Junior
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 15/15288-5 - Relação dos parâmetros dos sinais de atenuação obtidos via ultrassom com a qualidade de materiais compósitos
• Beneficiário: Roberto Ferreira Motta Junior
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica