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. 2018 Sep 18;11(9):1760.
doi: 10.3390/ma11091760.

Acoustic Emissions in 3D Printed Parts under Mode I Delamination Test

Claudia Barile  1 , Caterina Casavola  2 , Alberto Cazzato  3
Affiliations

Acoustic Emissions in 3D Printed Parts under Mode I Delamination Test

Claudia Barile et al. Materials (Basel). .

Abstract

This paper applies an innovative approach based on the acoustic emission technique to monitor the delamination process of 3D parts. Fused deposition modelling (FDM) is currently one of the most widespread techniques for additive manufacturing of a solid object from a computer model. Fundamentally, this process is based on a layer-by-layer deposition of a fused filament. The FDM technique has evolved to the point where it can now be proposed, not only as a prototyping technique, but also as one applicable to direct manufacturing. Nonetheless, a deeper comprehension of mechanical behavior and its dependence on process parameters must include the determination of material properties as a function of the service load. In this work, the effects of extrusion temperature on inter-layer cohesion are studied using a method employing a double cantilever beam (DCB). The ASTM D5528 standard was used to determine the delamination energy, GI. In addition, the acoustic emission technique was employed to follow the delamination process during testing. Finally, a Charge-Coupled Device (CCD) camera and a calibrated grid was employed to evaluate crack propagation during testing.

Keywords: Mode I fracture mechanics; acoustic emission; double cantilever beam; fused deposition modelling; orthotropic materials.

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Conflict of interest statement

The authors declare no conflicts of interest.

Figures

Figure 1
Figure 1
Mode I delamination test: schematic of the equipment.
Figure 2
Figure 2
Specimen geometry according to ASTM D5528.
Figure 3
Figure 3
Acquired image of the specimen showing the overlaid digital grid.
Figure 4
Figure 4
Crack opening during delamination test.
Figure 5
Figure 5
GI values calculated by Beam Theory (BT) and Modified Beam Theory (MBT).
Figure 6
Figure 6
Crack length vs. crosshead displacement.
Figure 7
Figure 7
Acoustic emissions recorded: (A) refers to Group A specimen (220 °C); (B) refers to Group B specimen (230 °C); (C) refers to Group C specimen (240 °C).
See this image and copyright information in PMC

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