Attaining a Controlled Graded Distribution of Particles in Polymerizing Fluid for Functionally Graded Materials
IR@AMPRI: CSIR-Advanced Materials and Processes Research Institute, Bhopal
View Archive Info| Field | Value | |
| Title |
Attaining a Controlled Graded Distribution of Particles in
Polymerizing Fluid for Functionally Graded Materials
|
|
| Creator |
Dr., S A R Hashmi
|
|
| Subject |
Polymeric Materials
|
|
| Description |
The precise control on concentration profile
of dispersion in functionally graded material (FGM) is essential
for obtaining a desired material. A suitable simulation
of parameters and an appropriate model that describes
the motion of particles in the fluid can predict various aspects
those are needed to produce FGM, by gravity sedimentation
or centrifugation technique. Simulation was conducted
to observe the changes in concentration profile, while
using the following equations applicable to polymerizing fluid,
and to determine the terminal velocities (Vm) of particles; Vm
� �D2��s � �l�g*�1 � �s�4.65�/�18�0ebtc� for gravity sedimentation
and Vm � �D2��s � �l�r�2(1��s�4.65}/(18�0 ebtc) for centrifugation,
where D is the diameter of the spherical particle, �s
the density of solid particles, �l the density of fluid, � the
viscosity of fluid, g* the acceleration due to gravity, �s is the
volume fraction of particles, and tc is the elapsed time of curing
of thermosetting resin. b is a constant, r is the radius, and � is
the angular velocity. This simulation demonstrates that the
time of centrifugation/sedimentation, particle size, distribution
of particle size, and centrifugal/gravitational forces can be
effectively utilized to attain a desired concentration profile in
graded materials. Simulation also revealed that there exist the
possibility of two graded profiles, namely low concentration
profile and high concentration profile, in one sample of graded
material, made either by centrifugation or sedimentation. Low
concentration profile is more sensitive to particle size distribution
as compared to high concentration profile. The present
simulation method is also sensitive to concentration-measuring
methods.
|
|
| Publisher |
Wiley Online Library
|
|
| Date |
2006
|
|
| Type |
Article
PeerReviewed |
|
| Identifier |
Dr., S A R Hashmi (2006) Attaining a Controlled Graded Distribution of Particles in Polymerizing Fluid for Functionally Graded Materials. Journal of Applied Polymer Science, 99. pp. 3009-3017. ISSN 0021-8995
|
|
| Relation |
http://ampri.csircentral.net/33/
|
|