scholarly journals Topology optimization and 3D printing of multimaterial magnetic actuators and displays

2019 ◽  
Vol 5 (7) ◽  
pp. eaaw1160 ◽  
Author(s):  
Subramanian Sundaram ◽  
Melina Skouras ◽  
David S. Kim ◽  
Louise van den Heuvel ◽  
Wojciech Matusik
Keyword(s):  
Topology Optimization ◽  
High Resolution ◽  
Three Dimensional ◽  
Design Synthesis ◽  
Magnetic Actuators ◽  
Three Dimensional Printing ◽  
Drop On Demand ◽  
Tightly Coupled ◽  
Actuation Systems ◽  
Dimensional Printing

Upcoming actuation systems will be required to perform multiple tightly coupled functions analogous to their natural counterparts; e.g., the ability to control displacements and high-resolution appearance simultaneously is necessary for mimicking the camouflage seen in cuttlefish. Creating integrated actuation systems is challenging owing to the combined complexity of generating high-dimensional designs and developing multifunctional materials and their associated fabrication processes. Here, we present a complete toolkit consisting of multiobjective topology optimization (for design synthesis) and multimaterial drop-on-demand three-dimensional printing for fabricating complex actuators (>106 design dimensions). The actuators consist of soft and rigid polymers and a magnetic nanoparticle/polymer composite that responds to a magnetic field. The topology optimizer assigns materials for individual voxels (volume elements) while simultaneously optimizing for physical deflection and high-resolution appearance. Unifying a topology optimization-based design strategy with a multimaterial fabrication process enables the creation of complex actuators and provides a promising route toward automated, goal-driven fabrication.

Multiple-Material Topology Optimization of Compliant Mechanisms Created Via PolyJet Three-Dimensional Printing

2014 ◽  
Vol 136 (6) ◽  
Author(s):  
Andrew T. Gaynor ◽  
Nicholas A. Meisel ◽  
Christopher B. Williams ◽  
James K. Guest
Keyword(s):  
Topology Optimization ◽  
Compliant Mechanisms ◽  
Three Dimensional ◽  
Three Dimensional Printing ◽  
Multiple Materials ◽  
Multiple Material ◽  
Phase Design ◽  
Dimensional Printing ◽  
Monolithic Structure ◽  
Single Material

Compliant mechanisms are able to transfer motion, force, and energy using a monolithic structure without discrete hinge elements. The geometric design freedoms and multimaterial capability offered by the PolyJet 3D printing process enables the fabrication of compliant mechanisms with optimized topology. The inclusion of multiple materials in the topology optimization process has the potential to eliminate the narrow, weak, hingelike sections that are often present in single-material compliant mechanisms and also allow for greater magnitude deflections. In this paper, the authors propose a design and fabrication process for the realization of 3-phase, multiple-material compliant mechanisms. The process is tested on a 2D compliant force inverter. Experimental and numerical performance of the resulting 3-phase inverter is compared against a standard 2-phase design.

scholarly journals Study of Layer Formation During Droplet-Based Three-Dimensional Printing of Gel Structures

2017 ◽  
Vol 139 (9) ◽  
Author(s):  
Kyle Christensen ◽  
Yong Huang
Keyword(s):  
Inkjet Printing ◽  
High Speed ◽  
Three Dimensional ◽  
Layer By Layer ◽  
Layer Formation ◽  
High Speed Imaging ◽  
Three Dimensional Printing ◽  
Drop On Demand ◽  
Image Velocimetry ◽  
Dimensional Printing

Additive manufacturing, also known as three-dimensional (3D) printing, is an approach in which a structure may be fabricated layer by layer. For 3D inkjet printing, droplets are ejected from a nozzle, and each layer is formed droplet by droplet. Inkjet printing has been widely applied for the fabrication of 3D biological gel structures, but the knowledge of the microscale interactions between printed droplets is still largely elusive. This study aims to elucidate the layer formation mechanism in terms of the formation of single lines and layers comprised of adjacent lines during drop-on-demand inkjet printing of alginate using high speed imaging and particle image velocimetry. Inkjet droplets are found to impact, spread, and coalesce within a fluid region at the deposition site, forming coherent printed lines within a layer. The effects of printing conditions on the behavior of droplets during layer formation are discussed and modeled based on gelation dynamics, and recommendations are presented to enable controllable and reliable fabrication of gel structures. The effects of gelation on droplet impact dynamics are found to be negligible during alginate printing, and interfaces are found to form between printed lines within a layer depending on printing conditions, printing path orientation, and gelation dynamics.

Three-dimensional printing of large objects with high resolution by scanning lithography

2019 ◽  
Vol 105 (10) ◽  
pp. 4147-4157
Author(s):  
Ran He ◽  
Justin Landowne ◽  
James Currie ◽  
Joachim Amoah ◽  
Wentao Shi ◽  
...  
Keyword(s):  
High Resolution ◽  
Three Dimensional ◽  
Three Dimensional Printing ◽  
Dimensional Printing

A novel fast disintegrating tablet fabricated by three‐dimensional printing

2009 ◽  
Vol 00 (00) ◽  
pp. 090730035508060-7
Author(s):  
Deng-Guang Yu ◽  
Chris Branford-White ◽  
Yi-Cheng Yang ◽  
Li-Min Zhu ◽  
Edward William Welbeck ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Three Dimensional Printing ◽  
Fast Disintegrating Tablet ◽  
Dimensional Printing

Central ossifying fibroma of mandible

2020 ◽  
Vol 13 (12) ◽  
pp. e239286
Author(s):  
Kumar Nilesh ◽  
Prashant Punde ◽  
Nitin Shivajirao Patil ◽  
Amol Gautam
Keyword(s):  
Fibrous Tissue ◽  
Three Dimensional ◽  
Facial Asymmetry ◽  
Ossifying Fibroma ◽  
Mandible Reconstruction ◽  
Three Dimensional Printing ◽  
Osseous Lesion ◽  
Large Size ◽  
Dimensional Printing

Ossifying fibroma (OF) is a rare, benign, fibro-osseous lesion of the jawbone characterised by replacement of the normal bone with fibrous tissue. The fibrous tissue shows varying amount of calcified structures resembling bone and/or cementum. The central variant of OF is rare, and shows predilection for mandible among the jawbone. Although it is classified as fibro-osseous lesion, it clinically behaves as a benign tumour and can grow to large size, causing bony swelling and facial asymmetry. This paper reports a case of large central OF of mandible in a 40-year-old male patient. The lesion was treated by segmental resection of mandible. Reconstruction of the surgical defect was done using avascular fibula bone graft. Role of three-dimensional printing of jaw and its benefits in surgical planning and reconstruction are also highlighted.

scholarly journals Three-Dimensional Printing in Orthopedics: from the Basics to Surgical Applications

2021 ◽  
Author(s):  
Leandro Ejnisman ◽  
Bruno Gobbato ◽  
Andre Ferrari de França Camargo ◽  
Eduardo Zancul
Keyword(s):  
Three Dimensional ◽  
Three Dimensional Printing ◽  
Dimensional Printing
Sign in / Sign up

Export Citation Format

Share Document