162
N. Bogojevi´ c et al.
5 Conclusion
In the paper are presented the results of experimental measurements of air flow
resistance and calculation of the frequency dependence of the sound absorption
coefficient of the polyamide PA12 samples produced by selective laser sintering
technology. The results have shown that the samples with thickness higher than 2.2
mm may be considered airtight, and that the absorption coefficient of the samples
with thicknesses above 0.7 mm are smaller than 0.05 in a wide sound frequency
range between 125 and 2500 Hz.
The obtained result means that the products manufactured from polyamide PA12
by the selective laser technology may be considered highly reflective for the purposes
of the sound propagation applications, such as design and construction of the
measurement equipment based on photoacoustic effect.
Acknowledgements The authors wish to acknowledge the support of European Commission
through the project “Advanced design rules for optimal dynamic properties of additive manufacturing products—A_MADAM”, which has received funding from the European Union’s Horizon
2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement
No. 734455. The authors also acknowledge the support of the Serbian Ministry of Science, Education
and Technology through the grants No. TR36005 and No. TR37020.
References
1. A.C. Tam, Applications of photoacoustic sensing techniques. Rev. Mod. Phys. 58(2), 381
(1986)
2. F. Setaki, M. Tenpierik, A. Timmeren, M. Turrin, New sound absorption materials: using
additive manufacturing for compact size, broadband sound absorption at low frequencies, in
Proceedings of the INTER-NOISE 2016 - 45th International Congress and Exposition on Noise
Control Engineering: Towards a Quieter Future, pp. 4073–4078, Hamburg, Germany (2016)
3. C. Jiang, D. Moreau, C. Doolan, Acoustic absorption of porous materials produced by additive
manufacturing with varying geometries, in Proceedings of ACOUSTICS 2017, P79, pp. 19–22
Nov 2017, Perth, Australia
4. Z. Liu, J. Zhan, M. Fard, J. Davy, Acoustic properties of a porous polycarbonate material
produced by additive manufacturing. Mater. Lett. 181, 296–299 (2016)
5. M. Schmid, A. Amado, K. Wegener, Polymer powders for selective laser sintering (SLS), in
AIP Conference proceedings, vol. 1664, no. 1, p. 160009. AIP Publishing
6. G.V. Salmoria, J.L. Leite, L.F. Vieira, A.T.N. Pires, C.R.M. Roesler, Mechanical properties
of PA6/PA12 blend specimens prepared by selective laser sintering. Polym. Testing 31(3),
411–416 (2012)
7. S. Dupin, O. Lame, C. Barrès, J.Y. Charmeau, Microstructural origin of physical and mechanical
properties of polyamide 12 processed by laser sintering. Eur. Polymer J. 48(9), 1611–1621
(2012)
8. B. Van Hooreweder, D. Moens, R. Boonen, J.P. Kruth, P. Sas, On the difference in material
structure and fatigue properties of nylon specimens produced by injection molding and selective
laser sintering. Polym. Testing 32(5), 972–981 (2013)
9. ISO 9053: 1991, Acoustics—Materials for acoustical applications—Determination of airflow
resistance. International Organisation for Standardization (1991)
N. Bogojevi´ c et al.
5 Conclusion
In the paper are presented the results of experimental measurements of air flow
resistance and calculation of the frequency dependence of the sound absorption
coefficient of the polyamide PA12 samples produced by selective laser sintering
technology. The results have shown that the samples with thickness higher than 2.2
mm may be considered airtight, and that the absorption coefficient of the samples
with thicknesses above 0.7 mm are smaller than 0.05 in a wide sound frequency
range between 125 and 2500 Hz.
The obtained result means that the products manufactured from polyamide PA12
by the selective laser technology may be considered highly reflective for the purposes
of the sound propagation applications, such as design and construction of the
measurement equipment based on photoacoustic effect.
Acknowledgements The authors wish to acknowledge the support of European Commission
through the project “Advanced design rules for optimal dynamic properties of additive manufacturing products—A_MADAM”, which has received funding from the European Union’s Horizon
2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement
No. 734455. The authors also acknowledge the support of the Serbian Ministry of Science, Education
and Technology through the grants No. TR36005 and No. TR37020.
References
1. A.C. Tam, Applications of photoacoustic sensing techniques. Rev. Mod. Phys. 58(2), 381
(1986)
2. F. Setaki, M. Tenpierik, A. Timmeren, M. Turrin, New sound absorption materials: using
additive manufacturing for compact size, broadband sound absorption at low frequencies, in
Proceedings of the INTER-NOISE 2016 - 45th International Congress and Exposition on Noise
Control Engineering: Towards a Quieter Future, pp. 4073–4078, Hamburg, Germany (2016)
3. C. Jiang, D. Moreau, C. Doolan, Acoustic absorption of porous materials produced by additive
manufacturing with varying geometries, in Proceedings of ACOUSTICS 2017, P79, pp. 19–22
Nov 2017, Perth, Australia
4. Z. Liu, J. Zhan, M. Fard, J. Davy, Acoustic properties of a porous polycarbonate material
produced by additive manufacturing. Mater. Lett. 181, 296–299 (2016)
5. M. Schmid, A. Amado, K. Wegener, Polymer powders for selective laser sintering (SLS), in
AIP Conference proceedings, vol. 1664, no. 1, p. 160009. AIP Publishing
6. G.V. Salmoria, J.L. Leite, L.F. Vieira, A.T.N. Pires, C.R.M. Roesler, Mechanical properties
of PA6/PA12 blend specimens prepared by selective laser sintering. Polym. Testing 31(3),
411–416 (2012)
7. S. Dupin, O. Lame, C. Barrès, J.Y. Charmeau, Microstructural origin of physical and mechanical
properties of polyamide 12 processed by laser sintering. Eur. Polymer J. 48(9), 1611–1621
(2012)
8. B. Van Hooreweder, D. Moens, R. Boonen, J.P. Kruth, P. Sas, On the difference in material
structure and fatigue properties of nylon specimens produced by injection molding and selective
laser sintering. Polym. Testing 32(5), 972–981 (2013)
9. ISO 9053: 1991, Acoustics—Materials for acoustical applications—Determination of airflow
resistance. International Organisation for Standardization (1991)