Abstract
This paper presents a novel manufacturing method for cellular
materials with a graded porosity distribution. The motivation for creating a
gradient of porosity in materials has been inspired by nature and aspires to
mimic natural structures so their intrinsic advantages (e.g., optimised
mechanical properties) can be exploited. Many engineering applications (e.g.,
thermal, acoustics, mechanical, structural and tissue engineering) require
porosity tailored structures. However, current manufacturing processes are
currently unable to mass-produce these foams. In this work, low power-low
frequency ultrasonic irradiation has been used to excite polymeric foaming
melts that, once solidified, contained different porosity distributions throughout
in their solid matrix. This was possible by controlling the amount of energy
imposed on the samples. The generation of porosity gradients that resembles
those of natural cellular structures (e.g., bones, stems) opens up new
opportunities in the design and manufacture of bio-inspired materials that can
solve challenging technological problems.
materials with a graded porosity distribution. The motivation for creating a
gradient of porosity in materials has been inspired by nature and aspires to
mimic natural structures so their intrinsic advantages (e.g., optimised
mechanical properties) can be exploited. Many engineering applications (e.g.,
thermal, acoustics, mechanical, structural and tissue engineering) require
porosity tailored structures. However, current manufacturing processes are
currently unable to mass-produce these foams. In this work, low power-low
frequency ultrasonic irradiation has been used to excite polymeric foaming
melts that, once solidified, contained different porosity distributions throughout
in their solid matrix. This was possible by controlling the amount of energy
imposed on the samples. The generation of porosity gradients that resembles
those of natural cellular structures (e.g., bones, stems) opens up new
opportunities in the design and manufacture of bio-inspired materials that can
solve challenging technological problems.
Original language | English |
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Pages (from-to) | 5-22 |
Journal | International Journal of Design Engineering |
Volume | 4 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2011 |
Keywords
- porosity gradient
- acoustic field
- design engineering
- Topography
- Ultrasound
- Manufacture
- cellular structure
- Polymeric foam
- bio-inspired structure