Geovane de A.S. da Silva , José R.M. d’Almeida , Daniel C.T. Cardoso , Priscilla S.C. Vieira , Bruno J. Lopes , Antonio H.M. da F.T. da Silva , Valber A. Perrut
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引用次数: 0
Abstract
This work deals with the mechanical degradation of glass-fiber/epoxy composites used in repairs of offshore metal pipelines exposed to aging in a saline environment. The materials used were a bicomponent DGEBA epoxy and a woven bidirectional E-glass fabric. In order to simulate the harsh environment, the composite was exposed to accelerated hygrothermal aging tests in three independent salt spray chambers at temperatures of 35, 55 and 70 °C. The composite had its mass gain and three-point bending properties monitored over time. It was observed that temperature played a major role in accelerating properties’ degradation. Additionally, for long-term exposure, the retention of mechanical properties presented a plateau, which could be perfectly modeled by the modified Phani and Bose model, proposed in this work. An innovative predictive methodology was developed based on this model, allowing extrapolation of long-term aging tests to temperatures different from those analyzed experimentally, including ambient temperature. The methodology developed is the key strength to be highlighted in the work, which allowed data extrapolation, reducing the number of experiments to evaluate the aging process of composites.
期刊介绍:
The past few decades have seen outstanding advances in the use of composite materials in structural applications. There can be little doubt that, within engineering circles, composites have revolutionised traditional design concepts and made possible an unparalleled range of new and exciting possibilities as viable materials for construction. Composite Structures, an International Journal, disseminates knowledge between users, manufacturers, designers and researchers involved in structures or structural components manufactured using composite materials.
The journal publishes papers which contribute to knowledge in the use of composite materials in engineering structures. Papers deal with design, research and development studies, experimental investigations, theoretical analysis and fabrication techniques relevant to the application of composites in load-bearing components for assemblies, ranging from individual components such as plates and shells to complete composite structures.