bachelorThesis
Efeitos da alteração dimensional em corpos de prova de compósitos PRFV submetidos ao ensaio de flexão conforme a norma ASTM D790
Fecha
2021-04-29Registro en:
ANDRADE, C. J. M. de. Efeitos da alteração dimensional em corpos de prova de compósitos PRFV submetidos ao ensaio de flexão conforme a norma ASTM D790. 2021. 44 p. Trabalho de Conclusão de Curso (Graduação em Engenharia Mecânica) - Universidade Federal do Rio Grande do Norte, Natal-RN, 2021.
Autor
Andrade, Cláudio José Montenegro de
Resumen
GFRP Composites (Glass Fiber Reinforced Plastics) have a wide range of applications in the aeronautical, automotive and aerospace industries, being subject to low-speed impact loads which makes it necessary to study their residual flexural properties. In such a context, ASTM D790 standard determines the guideliness for three-point bending test specifying the dimensions of the specimens. Therefore, the width defined for making the samples limits the number of specimens produced from a standardized and impacted plate. Hence this work aims to analyze the flexural mechanical properties of non-standardized specimens of GFRP composites, based on the results obtained by the standardized samples. The feasibility of using specimens made with smaller widths than ASTM D790 standard recommends for the evaluation of residual properties is also discussed. Thus two types of laminates were produced using Hand Lay-Up technique and changing the architecture of the fabrics. Then, the laminated plates were cut allowing the production of samples with standardized and non-standardized dimensions, being submitted to the three-point bending test afterward. The non-standardized specimens of both laminates (LCB and LCM) exhibited lower flexural and modulus than standardized samples. However, the behavior of the bending stress-strain curve of standardized and non-standardized specimens was similar. This contributes to making it possible to use non-standardized samples in the residual flexural strength after low-speed impact in GFRP composites. This scenario allows greater detail and reliability to the graphs that relate empirically the behavior of the residual flexural strength and modulus with increasing distance from to the impact point.