Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
STRAIN ENERGY RELEASE OF QUASI-STATIC DELAMINATION GROWTH RELATION WITH FIBRE VOLUME FRACTION, AND ACOUSTIC EMISSION
Submission Author:
Roberto Ferreira Motta Júnior , SP , Brazil
Co-Authors:
Roberto Ferreira Motta Júnior, Rene Alderliesten, Marcos Shiino, Maria Odila H. Cioffi, Herman J. C. Voorwald
Presenter: Roberto Ferreira Motta Júnior
doi://10.26678/ABCM.COBEM2019.COB2019-2412
Abstract
Composite laminates have been widely employed in aeronautics and aerospace industry as a consequence of its high mechanical properties with a low specific weight. However, due to the anisotropic nature of composites, this material presents low strength to out-of-plane stresses, which makes them susceptible to delamination. Composites have specific features that present a great influence over its mechanical properties, such as fiber volume fraction (FVF). The FVF can be varied in order to comply with design concerns and reach desired mechanical properties or as a consequence of some manufacturing event that originates regions with different FVF. This research work aims to study the influence of FVF variation over the strain energy released during delamination growth. The tests were conducted in carbon fiber reinforced polymers matrix under mode I quasi-static and low rate cyclic loading to analyse the potential of acoustic emission (AE) technique in quantifying physical damage. The low FVF decreased the strain energy released, and the number of acoustic signals detected during crack propagation. AE technique presented a strong relation with the strain energy released during delamination growth. Therefore, AE technique showed a great potential to quantify physical damage in composites.
Keywords
Carbon fiber reinforced polymer, fiber volume fraction, delamination, acoustic emission, energy release
