The Woodruff School

SUMMARY

Additive manufacturing, or 3D printing, as an advanced manufacturing technique, enables direct fabrication of complex architectures according to computer-aided design. Most 3D printing methods usually only allow one material to be printed at a time, which limit their broad applications. Driven by the growing demand for functional applications in robotics, electronics, biomedical devices, and wearable devices, multi-material 3D printing has drawn tremendous attention as it offers more design flexibility that can combine materials with various mechanical, chemical, thermal-mechanical or electrical properties. However, low cost, high-speed, high-resolution, and versatile multi-material 3D printing methods are still lacking. In this study, we propose a new hybrid multi-material 3D printing system that consists of a top-down digital light processing (DLP) printing and a direct ink writing (DIW) printing to fabricate composite structures and unique devices in a single printing job. The vat photopolymerization-based DLP printing allows for high-speed and high-resolution printing of a material matrix with complex geometry. The material extrusion-based DIW printing enables the printing of functional material, including liquid crystal elastomers (LCEs) and conductive silver inks. With this hybrid 3D printing system, a wide choice of inks and resins can be used to print functional composites with tunable mechanical properties, enhanced interfacial bonding, and multifunctionality. The preliminary results show that composites prototype, active soft robots, circuit-embedding architectures, and strain sensors can be printed with this method. And it is expected that the proposed research will lead to a new and robust approach for 3D printing of multi-functional devices for broad applications in soft robotics, electronics, active metamaterials, and biomedical devices.

https://teams.microsoft.com/l/meetup-join/19%3ameeting_NzYxODQ1NTItMGFkOS00MzdmLTgxNjQtMjZjZWZlZTQ5NjI5%40thread.v2/0?context=%7b%22Tid%22%3a%22482198bb-ae7b-4b25-8b7a-6d7f32faa083%22%2c%22Oid%22%3a%223f488826-02a4-4b11-8a58-de2216154333%22%7d

SUBJECT:	Ph.D. Proposal Presentation

BY:	XIRUI PENG

TIME:	Friday, February 18, 2022, 11:00 a.m.

PLACE:	RBI and Virtual, Virtual

TITLE:	Multimaterial 3D Printing by Integrating Digital Light Processing and Direct Ink Writing

COMMITTEE:	Dr. H. Jerry Qi, Chair (ME) Dr. Shuman Xia (ME) Dr. Yuhang Hu (ME) Dr. Ruike Renee Zhao (ME, Stanford University) Dr. Chieh-Min Cheng (Xerox Corporation)

SUMMARY Additive manufacturing, or 3D printing, as an advanced manufacturing technique, enables direct fabrication of complex architectures according to computer-aided design. Most 3D printing methods usually only allow one material to be printed at a time, which limit their broad applications. Driven by the growing demand for functional applications in robotics, electronics, biomedical devices, and wearable devices, multi-material 3D printing has drawn tremendous attention as it offers more design flexibility that can combine materials with various mechanical, chemical, thermal-mechanical or electrical properties. However, low cost, high-speed, high-resolution, and versatile multi-material 3D printing methods are still lacking. In this study, we propose a new hybrid multi-material 3D printing system that consists of a top-down digital light processing (DLP) printing and a direct ink writing (DIW) printing to fabricate composite structures and unique devices in a single printing job. The vat photopolymerization-based DLP printing allows for high-speed and high-resolution printing of a material matrix with complex geometry. The material extrusion-based DIW printing enables the printing of functional material, including liquid crystal elastomers (LCEs) and conductive silver inks. With this hybrid 3D printing system, a wide choice of inks and resins can be used to print functional composites with tunable mechanical properties, enhanced interfacial bonding, and multifunctionality. The preliminary results show that composites prototype, active soft robots, circuit-embedding architectures, and strain sensors can be printed with this method. And it is expected that the proposed research will lead to a new and robust approach for 3D printing of multi-functional devices for broad applications in soft robotics, electronics, active metamaterials, and biomedical devices. https://teams.microsoft.com/l/meetup-join/19%3ameeting_NzYxODQ1NTItMGFkOS00MzdmLTgxNjQtMjZjZWZlZTQ5NjI5%40thread.v2/0?context=%7b%22Tid%22%3a%22482198bb-ae7b-4b25-8b7a-6d7f32faa083%22%2c%22Oid%22%3a%223f488826-02a4-4b11-8a58-de2216154333%22%7d