Fatigue damage and fatigue life diagrams of a carbon/epoxy cross ply laminate aged by hygrothermal exposure
| Autor: | José Daniel Diniz Melo, Maikson Luiz Passaia Tonatto, Ramesh Talreja, Antônio Marcos de Medeiros, Sandro Campos Amico, Ana Paula Pereira Fulco |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Scanning electron microscope Delamination Weight change 02 engineering and technology Dynamic mechanical analysis Epoxy 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention Optical microscope Mechanics of Materials law visual_art Ceramics and Composites visual_art.visual_art_medium Relative humidity Fourier transform infrared spectroscopy Composite material 0210 nano-technology |
| Zdroj: | Composites Part A: Applied Science and Manufacturing. 127:105628 |
| ISSN: | 1359-835X |
| DOI: | 10.1016/j.compositesa.2019.105628 |
| Popis: | This study concerns the effects of hygrothermal aging on failure of carbon/epoxy composites subjected to fatigue loading. AS4/8552 laminates with stacking sequence [02/902]s are exposed to cycles of 4 h at 160 °C followed by 8 h of 80% average relative humidity at 70 °C, for a total exposure time of 2880 h. Fourier transform infrared (FTIR) spectroscopy, dynamic mechanical analysis (DMA), scanning electron microscopy (SEM) and change in weight, before and after hygrothermal exposure, are used to characterize the composites. Samples of plain epoxy 8552 are also exposed to the same aging conditions and characterized by optical microscopy (OM), FTIR spectroscopy and weight change. Stress-controlled tension-tension fatigue tests are then conducted using a stress ratio R = 0.1 and frequency of 5 Hz. The effects of hygrothermal aging on fatigue are interpreted by fatigue life diagrams as well as by studying evolution of ply crack density and delamination. |
| Databáze: | OpenAIRE |
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