TITLE:
Damping Factor Estimation of a Flexible-Matrix-Composite Body Pump
AUTHORS:
N. P. Kumar, H. Ghoneim
KEYWORDS:
Flexible-Matrix-Composites, Dynamic Mechanical Analyzer, Viscoelastic Characteristics, Damping Factor
JOURNAL NAME:
Journal of Materials Science and Chemical Engineering,
Vol.4 No.7,
July
25,
2016
ABSTRACT:
Two very important
factors which determine the effectiveness of a pump are its volumetric and
power efficiencies. Yin and Ghoneim constructed a prototype of a Flexible-Matrix-Composite
(FMC) body pump with a very high volumetric efficiency or pumping potential
(the relative volume reduction due to a relative input stroke). The high
volumetric efficiency is attributed to the geometry of the pump’s structure
(hyperboloid) as well as the high negative effective Poisson’s ratio of the
3-layer [θ/β/θ]
flexible-matrix-composite (carbon/polyurethane) laminate adopted for the body
of the pump. However, the power efficiency of the pump was not evaluated. It is
the objective of the current paper to obtain an estimate of the power
efficiency of the pump. The viscoelastic properties of the 3-layer FMC
(carbon/polyurethane) laminate are evaluated experimentally using the Dynamic
Mechanical Analyzer (DMA) as well as analytically by applying the correspondence
principle together with the micro-mechanics approach. In order to obtain an
estimate of the power efficiency of the FMC body pump, the axial and shear loss
factors of a laminated infinitely long cylindrical tube as functions of β and θ fiber orientation angles are determined employing the Adam and
Bacon approach. The analysis engenders high loss factors (greater than 0.4),
which suggests that the power efficiency of the proposed pump using the 3-layer
carbon/polyurethane laminate may be low.