3 research outputs found
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Thermal Analysis Of Fused Deposition
Fused Deposition processes involve successive melting, extrusion and solidification of
thermoplastic polymer melts. Fluid mechanics and heat transfer of neat or particle-filled
polymeric melts, viscoelastic deformation and solidification ofthe roads that are being produced,
and repetitive thermal loading of the growing part are important physical processes that control
the final quality of the part. Previous computational process models investigated deposition and
cooling processes for single and multiple filaments. In the current study, complimentary
computational models are presented for the extrusion phase of the process. Impact of liquefier
and nozzle design on thermal hardware behavior and operational stability has been quantified.
Also a detailed study of temperature field near the vicinity of deposition point is presented with
particular emphasis on dimensional analysis and deposition ofmultiple material systems.Mechanical Engineerin
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A Phenomenological Numerical Model For Fused Deposition Processing of Particle Filled Parts
Fused Deposition ModelingTM utilizes the simple idea of melting, extrusion and
resolidification of thermoplastic filaments. The introduction of particulate materials,
especially ceramics and metals, will widen the range of capabilities of the process. The
present study is directed to the development of a family of numerical models for the
FDM and Fused Deposition of Ceramics processes. These models in turn would help to
predict the operation windows of the FDM/FDC. Time-dependent mesh generation and
parameter file generation are incorporated into the developed two-dimensional model.
Finite element method is used in order to address heat transfer issues regarding the
solidification ofthe thermoplastic binderMechanical Engineerin
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Part Quality Prediction Tools for Fused Deposition Processing
Fused Deposition process fabricates requested part geometries by sequentially depositing
discrete curvilinear beads ofmaterial next to and on top of each other. The part integrity
depends strongly on the bonding quality at the bead interfaces. Since diffusion bonding of
thermoplastic components in the material system is thermally driven, temperature history
ofinterfaces determine the bonding quality. Detailed thermal analysis of deposition region
and layer building simulation for a model geometry have been performed to investigate
local and global material behavior during processing. A simple transport property
prediction model has also been developed for the determination of thermal transport
properties of the particle loaded systems used in Fused Deposition. Based on the
information obtained from thermal models, a computationally efficient part building
model has been developed to predict bonding quality in the whole part. The model is
driven by the same command file, sml file, that drives the Fused Deposition hardware;
and hence is capable of replicating the building process. The model has been tested for a
model geometry, spur gear, and three dimensional bonding quality distribution has been
predicted for the part.Mechanical Engineerin