Public Research Seminar by Sustainable Energy and Environment Thrust, HKUST(GZ) - Mechanical Properties of Additively-Manufactured Foam Structures Comprised of Identical Micrometer-size Cells
Two-photon polymerization (TPP) is a recently developed technique that was used to “write” millimeter-size cellular structures with micrometer-size resolution. The TPP process is being used to build support structures to stabilize cryogenic fill-tube targets by dissipating energy induced by vibrations that occur when the target is transported, and when the cryogenic shroud is removed. However, applications using these structures for their mechanical properties are less extensive, partially because less is known of these properties which depend on the processing parameters and structural design. This study investigates the performance of millimeter-size cellular auxetic structures (~0.2g/cm3) subjected to impulse loadings at room and cryogenic temperatures (20°C and -140 °C, respectively).
The stress-strain relationship, creep behavior, and recovery response of structures made from a proprietary thermoset acrylate resin (IP-STM) under static and dynamic loading is reported. Different auxetic structures were designed using two finite element programs, NX and ANSYS, to calculate the stress/strain distribution in the structure for different loads and to produce stereolithographic (STL) files for a commercial laser writer (Nanoscribe GmbH). These structures were tested using a Thermal Mechanical Analyzer (Perkin Elmer) at 20°C and -140 °C. The compression modulus and strength of the best-performing structure were 2.5x and 2x higher, respectively, at 20°C and -140 °C. Finally, the final designed structure is tested in a free vibration system to measure damping at low and high vibration frequencies.
Ming Wang was born in Wuhu, Anhui, China. He attended University of Wisconsin—Eau Claire and Anhui Normal University and graduated with a Bachelor of Science degree in Chemistry in 2013. He enrolled in the master’s degree program in Chemical Engineering at the University of Rochester in 2014. After two years master program, he was convinced to begin his Doctorate studies working with Professor David Harding. After a change in research topics, he was funded by the Horton Fellowship from the LLE to undertake research into Mechanical Properties of Additively-Manufactured Foam Structures Comprised of Identical Micrometer-size Cells. The following talks and posters were a result of work conducting during doctoral study:
Ming Wang, David Harding, Mechanical properties of micrometer-size foam structures, Oral, 24th Target Fabrication Meeting, June 2022
Ming Wang, David Harding, Mechanical properties of micrometer-size cellular foam-like Auxetic structures, Material Research Society Fall, 2021
Ming Wang, David Harding, Young’s Modulus of Two-photon Polymerization Resin and Compression Modulus of a Microscale Auxetic Foam, Target Fabrication Workshop, 2021
Ming Wang, David Harding, Mechanical Properties of micrometer-size Auxetic structure at Room Temperature, Material Research Society Fall 2019
For inquiries, please contact Miss Suggi WU (+86-20-88332966, suggilswu@hkust-gz.edu.cn)