Continuous lattice fabrication of ultra-lightweight composite structures
| Autor: | Joanna C.H. Wong, Martin Eichenhofer, Paolo Ermanni |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0209 industrial biotechnology
Fabrication Materials science Composite number Biomedical Engineering 02 engineering and technology Fibre-reinforced plastic 021001 nanoscience & nanotechnology Industrial and Manufacturing Engineering 020901 industrial engineering & automation Compressive strength Pultrusion Lattice (order) Volume fraction General Materials Science Extrusion Composite material 0210 nano-technology Engineering (miscellaneous) |
| Zdroj: | Additive Manufacturing. 18:48-57 |
| ISSN: | 2214-8604 |
| Popis: | This paper introduces continuous lattice fabrication (CLF) – a novel additive manufacturing (AM) technique invented for fiber-reinforced thermoplastic composites – and demonstrates its ability to exploit anisotropic material properties in digitally fabricated structures. In contrast to the layer-by-layer approaches employed in most AM processes, CLF enables the directed orientation of the fibers in all spatial coordinates, that is in the x- , y- , and z- directions. Based on a serial pultrusion and extrusion approach, CLF consolidates commingled yarns in situ and allows for the continuous deposition of high fiber volume fraction (>50%) materials along a programmable trajectory without the use of molds or sacrificial layers by exploiting the high viscosities of fiber-filled polymer melts. The capacity of CLF to produce high-performance structural components is demonstrated in the fabrication of an ultra-lightweight load-bearing lattice structure with outstanding stiffness-to-density and strength-to-density performance (compression modulus of 13.23 MPa and compressive strength of 0.20 MPa at a core density of 9 mg/cm 3 ). This digital fabrication method enables new approaches in load-tailored design, including the possibility to build freeform structures, which have previously been overlooked due to difficulties and limitations in modern fiber composite manufacturing capabilities. |
| Databáze: | OpenAIRE |
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