Open AccessExperimental research regarding some dynamic parameters determination for sandwich bars reinforced with carbon fiber
Author(s) -
Cosmin Mihai Miriţoiu,
Cristian Oliviu Burada,
Daniela Florentina Tărâţă,
Alexandru Bolcu,
Valeriu Ionică
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/568/1/012041
Subject(s) - materials science , composite material , stiffness , rigidity (electromagnetism) , vibration , loss factor , polypropylene , deformation (meteorology) , added mass , damping ratio , fiber , composite number , structural engineering , acoustics , physics , engineering , optoelectronics , dielectric
For this study, we have built some composite sandwich bars with polypropylene honeycomb core reinforced with carbon fiber. We have clamped the bars at one end and we left them to vibrate freely. From the free vibrations we have determined the damping factors per unit mass and length, loss factor, dynamic Young modulus, dynamic stiffness and the frequency of the first eigenmode. The general conclusions obtained from the vibrations results show tat the sample width can influence the damping coefficient, by the fact that it determines the surface in which the air friction acts on the sample. The sample mass or specific linear mass influence the damping factor by the fact that the samples with higher mass and width, the deformation energy which is stored in the sample through the initial deformation, is dissipated in a larger quantity of material. An influence may occur due to the sample rigidity, explained by the fact that a force initially applied to the sample produces a smaller deformation if the stiffness is higher.