Residual stress measurement in Fused Deposition Modelling parts

Fused Deposition Modelling (FDM) has become one of the most employed technologies to build complex 3D prototypes directly from a computerized solid model. In this process, the model is built as a layer-by-layer deposition of a feedstock wire. One of the most important issues in the FDM process is th...

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Bibliographic Details
Published in:Polymer testing 2017-04, Vol.58, p.249-255
Main Authors: Casavola, Caterina, Cazzato, Alberto, Moramarco, Vincenzo, Pappalettera, Giovanni
Format: Article
Language:English
Subjects:
Drilling
Electronic speckle pattern interferometry
Fused deposition modeling
Fused Deposition Modelling
Hard surfacing
Hole drilling
Modelling
Orthotropic materials
Raw materials
Residual stress
Residual stresses
Speckle interferometry
Stacking sequence (composite materials)
Strain gauges
Stress concentration
Stress distribution
Stress measurement
Stress relaxation
Studies
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Summary:Fused Deposition Modelling (FDM) has become one of the most employed technologies to build complex 3D prototypes directly from a computerized solid model. In this process, the model is built as a layer-by-layer deposition of a feedstock wire. One of the most important issues in the FDM process is the distortion of the part during the printing. This issue is due to the rapid heating and cooling cycles of the feedstock material that could produce accumulation of residual stress during part building up. The aim of this work is to measure the residual stress in FDM parts made of ABS employing the hole-drilling method. In order to avoid the local reinforcement of the strain gage, an optical technique, i.e. ESPI (electronic speckle pattern interferometry), is employed to measure the displacement of the surface due to the stress relaxation. Furthermore, the effect of the stacking sequence and the residual stress distribution on each side of the specimen have been investigated.
ISSN:0142-9418
1873-2348
DOI:10.1016/j.polymertesting.2017.01.003