Fatigue and Failure Analysis of Sandwich Composites using Two Types of Cross-Ply Glass Fibers Laminates and Epoxy Resin

João Pedro  Monteiro Cheloni; Marcio Eduardo  Silveira; Eder Sócrates  Najar Lopes; Leandro José  da Silva

doi:10.6000/1929-5995.2022.11.06

Authors

João Pedro Monteiro Cheloni LabMA – Advanced Manufacturing Laboratory, University of Campinas, Mechanical Engineering Department, Campinas, SP, Brazil https://orcid.org/0000-0001-6568-2426
Marcio Eduardo Silveira CITeC - Center of Technological Innovation on Composite Materials, Federal University of São João Del Rei-UFSJ, Mechanical Engineering Department, São João Del Rei, MG, Brazil
Eder Sócrates Najar Lopes LabMA – Advanced Manufacturing Laboratory, University of Campinas, Mechanical Engineering Department, Campinas, SP, Brazil
Leandro José da Silva CITeC - Center of Technological Innovation on Composite Materials, Federal University of São João Del Rei-UFSJ, Mechanical Engineering Department, São João Del Rei, MG, Brazil

DOI:

https://doi.org/10.6000/1929-5995.2022.11.06

Keywords:

Sandwich composite, bending fatigue, stiffness degradation, failure modes

Abstract

Sandwich structures have become effective structural elements for engineering applications due to their good design flexibility. Understanding the material behavior under static and dynamic loads, as well as the failure mechanisms of these sandwich structures, is of great importance. This work evaluates the fatigue and static bending behavior of epoxy resin specimens and sandwich composites composed of an epoxy resin core with glass fiber laminated faces. The fatigue life, failure modes, and stiffness degradation of these specimens are determined experimentally. The specimens were cycled under constant amplitude and monitored by a data acquisition system that allowed continuous data collection. Three stages of failure were identified using microscope analyses and stiffness degradation curves. In the case of an imposed displacement of 2 mm, the sandwich structures were shown to have a significantly lower fatigue life than the epoxy resin specimens.

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