
Dubbed MaTrEx-AM (Material Treatment Extrusion Additive Manufacturing), the technique from Loughborough University uses acetone to add durability to targeted layers of the deposited material. According to the Loughborough team, varying how much acetone is applied and where it is used allows manufacturers to create items with novel mechanical properties, such as controlling how parts deform.
βThe process adds material layer-by-layer β there are grooves between the layers, a bit like youβd see if you stacked lot of logs sideways on top of one another, all lined up,β said Dr Andy Gleadall, a senior lecturer in additive manufacturing at Loughborough. β3D printed parts are often weak because of the way layers are laid down in sequence, so there are geometric defects between the layers and the bonding of material between layers may not be as good as the pure polymer.β
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Real-world applications for the new AM technique include biomedical implants, as well as 4D lattices for helmet padding that could help minimise head injuries in contact sports or in defence and security settings. The research paper,Β MaTrEx-AM: a new hybrid additive manufacturing process to selectively control mechanical properties, was published in Additive Manufacturing.
βThe new capabilities are potentially valuable for a huge range of parts and structures, but perhaps most obvious ones would be parts that deform during operation and the way in which they deform needs to be controlled,β said Dr Gleadall.
βThe time-dependent nature of mechanical properties means the approach adds a new dimension to material capabilities, with in-situ hybrid processing facilitating a true 4D printing process.β
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