A group of China-based researchers have developed a new way of adding color to 3D printed parts that’s said to result in much safer products than conventional dyeing or pigmentation. The scientists’ approach revolves around a biocompatible ink they’ve developed, which yields parts capable of changing appearance through ‘structural coloration,’ in response to heat or light stimuli. Using their material, the team say it could be possible to produce everything from wearable bio-sensors to more child-safe toys. “We believe that [our] cholesteric liquid crystal ink can shed light on next-generation environmentally friendly 3D photonic printing,” the team explain in their paper, published in this week’s Proceedings Of The National Academy Of Sciences journal. “The ink maintains a cholesteric liquid crystalline state that gives rise to the structural color.” A 3D printed part changing color under different thermal conditions. Image via the South China Morning post. Overcoming the toxicity of dyeing… read more
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Researchers from Tsinghua University and the National University of Singapore are investigating the effects of fluid flow on the mechanical properties of metal 3D printed parts. When it comes to metal additive manufacturing technologies like laser powder bed fusion, carefully controlling the formation of new grains and dendrites in printed parts is crucial for tuning the final grain structure. This is important because grain structure and grain size have a significant effect on almost all mechanical properties, including hardness, yield strength, tensile strength, fatigue strength, and impact strength. There are a whole host of factors and parameters that can influence the formation of new grains and dendrites in 3D printing, but temperature gradient and solidification velocity are already thought to be prime determinants. According to the researchers however, the effects of fluid flow in the melt pool of a 3D printed part haven’t yet been investigated. SEM imaging of a… read more
The shipbuilding process, like aerospace development, often requires the construction of scale models of the vehicle in question in order to validate certain aspects of the design before splashing out on a full scale manufactured product. You have seen this with aircraft in wind tunnels, where the geometric model is used to represent the aerodynamic surfaces on an aircraft in flight. Similarly, ship models of various scales are used for a variety of fluid dynamic analyses in various fluid testing facilities. With ships, the models can take around 3 weeks to build out of wood, which is typically carved up via CNC. South Korean shipbuilder Daewoo Shipbuilding & Marine Engineering Co. has teamed up with Ingersoll to utilize thermoplastic additive manufacturing to produce these models, resulting in a 40 percent reduction in build time. You see the 10-meter long ABS model being printed in the image below. ABS ship scale… read more
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