Printed Flexible LC Filter Using Additive Micro-Dispensing With Silver Conductive Paste and ECA for Component Attachment

Filters are used in a variety of signal processing applications in commercial and defense electronics. The use of additively printed electronics in high-frequency applications requires an understanding of the process-performance interactions versus frequency of operation. Assembly of filters for integration into existing circuits requires additively printed metallization traces in addition to component attachment methods. Comparison of frequency response of the additively-printed filtering circuits vs conventional filters subtractively-fabricated on rigid substrates is needed to determine the performance parity of additive fabrication methods. In this paper, a micro-dispensing device is used to print conductive traces and electrically conductive adhesive (ECA) pads for the attachment of components. The effect of different print parameters on the width and height of the trace has been studied. Mechanical and electrical properties also play an important role in the study of different sintering conditions. Optimized parameters from the printing process and sintering analysis are used to print and compare commercially available LC filter circuitry using the Bode plot.

Poly(Lactic Acid)/Graphite Nanoplatelet Nanocomposite Filaments for Ligament Scaffolds

The anterior cruciate ligament (ACL) is one of the most prone to injury in the human body. Due to its insufficient vascularization and low regenerative capacity, surgery is often required when it is ruptured. Most of the current tissue engineering (TE) strategies are based on scaffolds produced with fibers due to the natural ligament’s fibrous structure. In the present work, composite filaments based on poly(L-lactic acid) (PLA) reinforced with graphite nanoplatelets (PLA+EG) as received, chemically functionalized (PLA+f-EG), or functionalized and decorated with silver nanoparticles [PLA+((f-EG)+Ag)] were produced by melt mixing, ensuring good filler dispersion. These filaments were produced with diameters of 0.25 mm and 1.75 mm for textile-engineered and 3D-printed ligament scaffolds, respectively. The resulting composite filaments are thermally stable, and the incorporation of graphite increases the stiffness of the composites and decreases the electrical resistivity, as compared to PLA. None of the filaments suffered significant degradation after 27 days. The composite filaments were processed into 3D scaffolds with finely controlled dimensions and porosity by textile-engineered and additive fabrication techniques, demonstrating their potential for ligament TE applications.

Non-linear fabrication: A dialogue between architecture and robotic wire-arc additive manufacture

<p><b>Within architecture the joint is an integral part of a building’s dialogue withits users and audience. Steel joints allow for the extension of membersand fundamental changes between columns and beams. However, dueto the limitation of traditional metal fabrication, highly parametric andcomputational informed designs are constrained by the conditions ofmass production. High output low cost, limiting the highly variable natureof geometrical informed individual joints.</b></p> <p>Through the fabrication of computational informed architectural steelconnection in combination with non-linear geometric segmentation and6-axis robotic wire arc additive manufacture (WAAM), this researchaims to optimise the aesthetic opportunities and practical fabrication oflarge-scale steel architectural joints. Currently, there exists a disconnectbetween the dialogue of metal joints and architectural intent. Throughthe innovative use of non-linear fabrication and member informed multidirectionalslicing, this research aims to construct a closed digital designloop though to fabrication. Utilising the additive fabrication processof WAAM, to construct a mass-customisable metal node which stillmaintains an aesthetic architectural opportunity.</p> <p>The aims of this research are to outline the potential of fabricating masscustomisablesteel joints through the process of non-linear segmentation.</p> <p>Describing the methods and techniques used to fabricate a computationalinformed metal joint through the manufacturing process of WAAM.</p>

Non-linear fabrication: A dialogue between architecture and robotic wire-arc additive manufacture

<p><b>Within architecture the joint is an integral part of a building’s dialogue withits users and audience. Steel joints allow for the extension of membersand fundamental changes between columns and beams. However, dueto the limitation of traditional metal fabrication, highly parametric andcomputational informed designs are constrained by the conditions ofmass production. High output low cost, limiting the highly variable natureof geometrical informed individual joints.</b></p> <p>Through the fabrication of computational informed architectural steelconnection in combination with non-linear geometric segmentation and6-axis robotic wire arc additive manufacture (WAAM), this researchaims to optimise the aesthetic opportunities and practical fabrication oflarge-scale steel architectural joints. Currently, there exists a disconnectbetween the dialogue of metal joints and architectural intent. Throughthe innovative use of non-linear fabrication and member informed multidirectionalslicing, this research aims to construct a closed digital designloop though to fabrication. Utilising the additive fabrication processof WAAM, to construct a mass-customisable metal node which stillmaintains an aesthetic architectural opportunity.</p> <p>The aims of this research are to outline the potential of fabricating masscustomisablesteel joints through the process of non-linear segmentation.</p> <p>Describing the methods and techniques used to fabricate a computationalinformed metal joint through the manufacturing process of WAAM.</p>

An additive algorithm for origami design

Inspired by the allure of additive fabrication, we pose the problem of origami design from a different perspective: How can we grow a folded surface in three dimensions from a seed so that it is guaranteed to be isometric to the plane? We solve this problem in two steps: by first identifying the geometric conditions for the compatible completion of two separate folds into a single developable fourfold vertex, and then showing how this foundation allows us to grow a geometrically compatible front at the boundary of a given folded seed. This yields a complete marching, or additive, algorithm for the inverse design of the complete space of developable quad origami patterns that can be folded from flat sheets. We illustrate the flexibility of our approach by growing ordered, disordered, straight, and curved-folded origami and fitting surfaces of given curvature with folded approximants. Overall, our simple shift in perspective from a global search to a local rule has the potential to transform origami-based metastructure design.