Zgadzam się
Nasza strona zapisuje niewielkie pliki tekstowe, nazywane ciasteczkami (ang. cookies) na Twoim urządzeniu w celu lepszego dostosowania treści oraz dla celów statystycznych. Możesz wyłączyć możliwość ich zapisu, zmieniając ustawienia Twojej przeglądarki. Korzystanie z naszej strony bez zmiany ustawień oznacza zgodę na przechowywanie cookies w Twoim urządzeniu.
The research was financed in the framework of the project Lublin University of Technology – Regional Excellence
Initiative, funded by the Polish Ministry of Science and Higher Education (contract no. 030/RID/2018/19).
Materiał konferencyjny:
TAK
Nazwa konferencji:
9th International Conference on Fluid Flow, Heat And Mass Transfer
The external environments have significant influence on the materials, especially for its structures exposed on harmful
conditions. The main goal of this work is the determination of environmental factors which influenced on the dynamical
behaviour of composite structures. In the paper is discussing the effects of UV and temperature on amplitude – frequency
responses of analysed material. The dynamics is experimentally tested on polymer composites based on a thermosetting
matrix of epoxy resin, reinforced by high-strength R-type glass fibres. There was provided series of cantilever beam
samples consisting of 11 plies layer at different stacking sequence, which secured both, symmetric (+/+) and anti-
symmetric (+/-) configurations of beam samples. In the experiment were applied the composite samples with fibres
configuration at 30º, 45º and 60º angles. For each angel set the amplitude – frequency responses were recorded within the
first three base translational resonance zones from 10Hz to 320Hz at sweep up frequencies.
The experiments have been carried out on electro-dynamical shaker TIRA Vib which assured the conditions of
vibration. The measurements were repeated after the conditioning processes which simulated the separate time range
corresponded to two-month periods. The first test was limited directly to the beams after manufactured in autoclave
system. Then the initial results of amplitude – frequency responses were compared to the next tests of the same beams but
conditioned by UV lights and temperature influence. It turned out the significant differences of results are visible between
the beams with symmetric and anti-symmetric fibres configurations. Additionally the dynamics of conditioned composite
beams varied from each other in both cases of fibres layout. Both conditioning, UV lights and temperatures caused the
resonance zones moved from the origin position, significantly changing the dynamic properties of composite structures
into softening or hardening features.
