Polymer lattices with 50% and 70% porosity were fabricated with beam diameters of 0.4-1.0mm, with measured effective elastic moduli from 28MPa to 213MPa. Structures are configured as beam-based lattices intended for use in novel spinal cage devices for bone fusion, fabricated with polyjet printing. Here, we focus on conducting experiments to mechanically characterize lattice structures to measure properties that inform an integrated design, manufacturing, and experiment framework. We also present a use case in which an erroneous print of a tibial knee prosthesis is identified.Īdvances in three-dimensional (3D) printing are enabling the design and fabrication of tailored lattices with high mechanical efficiency. We evaluate our methods using three different types of 3D printers and one CNC machine and find them to be 100% accurate when detecting erroneous prints in real time. Not only will these methods allow the end user to verify the accuracy of printed models, but they will also save material costs by verifying the prints in real time and stopping the process in the event of a discrepancy. The scheme incorporates analyses of the acoustic signature of a manufacturing process, real-time tracking of machine components, and post production materials analysis.
#Obfuscated xz verification#
In this paper, we develop a scheme of verification and intrusion detection that is independent of the printer firmware and controller PC. Safety-critical products, such as medical prostheses and parts for aerospace and automotive industries are being printed by additive manufacturing methods with no standard means of verification. This scheme of embedded obfuscated codes proves to be a highly customizable and efficient process while securing product design files.Īdditive Manufacturing is an increasingly integral part of industrial manufacturing. The embedded three-dimensional codes are scanned using a micro-CT scan.
#Obfuscated xz code#
The present work studies the possibility of printing a barcode inside the additively manufactured part and develops a scheme to obfuscate the code design to read differently from different directions to enhance the security and protect the intellectual property. However, AM due to layer-by-layer manufacturing process provides opportunities of embedding information inside the part during manufacturing, which has been explored recently to embed identification codes inside the parts. New technologies such as Blockchain have been promising in supply chain authentication. Additive manufacturing (AM) has been adopted for manufacturing complex shaped highly customized components for aerospace, automotive, and medical fields, where intellectual property protection and counterfeit detection are major concerns.
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