Coefficient of Sound Absorption
of Polyamide PA12 Samples
Manufactured by Selective Laser
Sintering
Nebojša Bogojevi´ c, Branko Radiˇ cevi´ c, Aleksandar Vrani´ c,
and Snežana ´
Ciri´ c Kosti´ c
Abstract Selective laser sintering is the additive manufacturing technology that is
predominantly used for production of small series of products and prototypes, and
the polyamide PA 12 represents the basic material for the technology process. The
technology presents a reasonable choice for production of scientific instruments and
laboratory equipment, as it is the case with the equipment for material characterization by sound absorption or emission. As the sound absorption by the instruments
and equipment may affect interpretation of the obtained results, it is useful to know
the frequency dependence of the sound absorption coefficient of the material used
for their construction. The paper presents the results of measurements of the sound
absorption coefficients of the PA12 samples with thicknesses between 0.7 mm and
2.2 mm in the frequency range between 125 Hz and 2.5 kHz, which is predominantly
used in the photoacoustic applications. The measurements were performed according
to the method SRPS ISO 9053, using the resistance of the airflow measurements and
the Miki model. The obtained results show that the sound absorption coefficient
of the PA12 samples manufactured by laser sintering are lower than 0.05 within
the frequency range, and that it monotonously increases with frequency, similar to
the behaviour of some other studied polymers and composite materials based on
polymers.
1 Introduction
In the recent years, the additive manufacturing (AM) has become a mature technology
that is, due to the short lead times and high manufacturing costs, predominantly used
for production of prototypes and small series of products. For this reason, the AM is
increasingly used for construction and reconstruction of scientific instrumentation,
especially for configurable and customizable measurement equipment.
N. Bogojevi´ c (B) · B. Radiˇ cevi´ c · A. Vrani´ c · S. ´
C. Kosti´ c
Faculty of Mechanical and Civil Engineering in Kraljevo, University of Kragujevac, Kraljevo,
Serbia
e-mail: bogojevic.n@mfkv.kg.ac.rs
© Springer Nature Switzerland AG 2021
N. Herisanu and V. Marinca (eds.), Acoustics and Vibration of Mechanical
Structures—AVMS 2019, Springer Proceedings in Physics 251,
https://doi.org/10.1007/978-3-030-54136-1_15
155
of Polyamide PA12 Samples
Manufactured by Selective Laser
Sintering
Nebojša Bogojevi´ c, Branko Radiˇ cevi´ c, Aleksandar Vrani´ c,
and Snežana ´
Ciri´ c Kosti´ c
Abstract Selective laser sintering is the additive manufacturing technology that is
predominantly used for production of small series of products and prototypes, and
the polyamide PA 12 represents the basic material for the technology process. The
technology presents a reasonable choice for production of scientific instruments and
laboratory equipment, as it is the case with the equipment for material characterization by sound absorption or emission. As the sound absorption by the instruments
and equipment may affect interpretation of the obtained results, it is useful to know
the frequency dependence of the sound absorption coefficient of the material used
for their construction. The paper presents the results of measurements of the sound
absorption coefficients of the PA12 samples with thicknesses between 0.7 mm and
2.2 mm in the frequency range between 125 Hz and 2.5 kHz, which is predominantly
used in the photoacoustic applications. The measurements were performed according
to the method SRPS ISO 9053, using the resistance of the airflow measurements and
the Miki model. The obtained results show that the sound absorption coefficient
of the PA12 samples manufactured by laser sintering are lower than 0.05 within
the frequency range, and that it monotonously increases with frequency, similar to
the behaviour of some other studied polymers and composite materials based on
polymers.
1 Introduction
In the recent years, the additive manufacturing (AM) has become a mature technology
that is, due to the short lead times and high manufacturing costs, predominantly used
for production of prototypes and small series of products. For this reason, the AM is
increasingly used for construction and reconstruction of scientific instrumentation,
especially for configurable and customizable measurement equipment.
N. Bogojevi´ c (B) · B. Radiˇ cevi´ c · A. Vrani´ c · S. ´
C. Kosti´ c
Faculty of Mechanical and Civil Engineering in Kraljevo, University of Kragujevac, Kraljevo,
Serbia
e-mail: bogojevic.n@mfkv.kg.ac.rs
© Springer Nature Switzerland AG 2021
N. Herisanu and V. Marinca (eds.), Acoustics and Vibration of Mechanical
Structures—AVMS 2019, Springer Proceedings in Physics 251,
https://doi.org/10.1007/978-3-030-54136-1_15
155