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Title: Damping behaviour analysis of 3d printed samples with pores
Authors: Goken, J
Saba, Nicolas 
Keywords: 3D printing
Polylactic acid
Damping measurement
Issue Date: 2020
Part of: Acta physica polonica A
Volume: 138
Issue: 6
Start page: 844
End page: 853
3D printing offers the possibility of introducing pores into the material in a targeted manner. This results
in a low-density material which can also act as a passive damping material with increased damping
properties. Against the background of noise and vibration control, an adjustable damping behaviour is
of technical interest. Strain- and frequency-dependent damping measurements were carried out at room
temperature on rectangular samples made from polylactic acid which is a bioactive and biodegradable
polyester. The samples were produced using a commercially available 3D printer. Different pore sizes
and pore distances were realised. Afterwards, the impact on the damping behaviour was analysed.
A monotonic increase in damping of both non-porous and porous specimens occured when the increase
of material strain was noticed. The damping was dependent on the pore size but this became clear for
larger pores. Pore spacing seemed to be less important. Frequency-dependent damping measurements
of non-porous and porous samples showed a slight decrease in damping with the increasing frequency
in the selected frequency range from 10 Hz to about 60 Hz. The results were significantly influenced
by the pore size. A slight increase in material damping with the increasing pore spacing was observed.
Further, “voids” (empty spaces) were found in the immediate vicinity around the pores which varied
greatly in both length and width. Their individual influence on the overall damping must be taken into
account. Only after a certain combination of pore size and porosity onwards, a dominant influence of
these two parameters can be expected.
Open URL: Link to full text
Type: Journal Article
Appears in Collections:Department of Mechanical Engineering

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