Vibration-based Nondestructive Testing to Determine Viability of Parts Produced with Recycled Thermoplastic Composites
Publication: Publication Date: 1 February 2016Testing Method:
The economic impact of the nearly half-trillion
dollar recycling and reuse industry notwithstanding,
recycling and reprocessing of materials
holds significant socio-environmental value.
However, variances in physical or mechanical properties
in reprocessed material can be an impediment
to the adoption of recycled material in
industrial applications. Operating ranges of
systems from the rocker-bogie suspension on the
National Aeronautics and Space Administration
Curiosity Rover to agitator assemblies in everyday
washing machines are constrained by system
resonance and damping. Variances beyond design
specifications from material reprocessing could
render these systems inoperable. In a previous
study, the authors demonstrated the viability of
recycled carbon fiber (RCF) as a raw material for
making long fiber thermoplastic (LFT) compounds
using polyphenylene sulfide (PPS) as the matrix
resin. The mechanical properties achieved with
recycled fibers were similar to those achieved with
commercial LFT material. The current study investigates
the influence of reprocessing carbon fiber
PPS (C/PPS) thermoplastics over six generations
(control plus five) on dynamic behavior in terms of
resonant frequency and damping by subjecting
C/PPS from each generation to vibration excitation
in a free-free boundary condition. Very little change
in the vibration response of C/PPS was observed,
with successive generations further corroborating
the viability of RCF for LFT compounds.
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