Many congratulations to Mengyue Li for passing the doctoral dissertation defense in Tianjin University. His thesis was awarded the "3A" thesis on the platform of the Ministry of Education, and passed the doctoral dissertation defense on May 7, 2026.

        Since joining the laboratory in September 2020 to pursue his Ph.D., Mengyue Li has been dedicated to the research of kinematic design and property programmability of multifunctional tubular origami metamaterials. He established a kinematic synthesis framework for single-degree-of-freedom tubular origami structures based on four-crease vertices and derived the geometric compatibility conditions for tubular structures with generalized spatial polygonal cross-sections. On this basis, he constructed single-tubular, double-tubular, and triple-tubular origami metamaterials, realizing the systematic design from a single structural unit to complex spatial metamaterials. He systematically revealed the influence of mountain-valley crease assignments on the geometric morphology, mechanical properties, and acoustic performance of single-tubular origami metamaterials, demonstrating the key role of the mountain-valley assignment as a topological design variable in performance programming. He established the non-unique mapping relationships among design parameters, initial folding states, and the mechanical and acoustic responses of double-tubular origami metamaterials, achieving independent programming of multi-physical performance within the feasible domain of specific parameters, and verified the capability of configuration reconfiguration and performance tuning based on thermoplastic materials. He constructed triple-tubular origami metamaterials with orthotropic mechanical properties, revealed their fundamentally different deformation mechanisms in orthogonal directions, elucidated the nonlinear influences of design angles and initial folding angles on the performance, and realized the integration of multiple mechanical mechanisms within a single structure. Based on the above theoretical studies, he has published five SCI journal papers in Composites Part B: Engineering, International Journal of Mechanical Sciences, Mechanism and Machine Theory, and other journals.

        Finally, we would like to express our sincere gratitude to the experts on the defense committee: Committee Chair Prof. Yuesheng Wang from Tianjin University, and committee members Prof. Changqing Chen from Tsinghua University, Prof. Guowu Wei from the University of Salford, Prof. Rui Zhu from Beijing Institute of Technology, and Prof. Yang Liu from Tianjin University. Thank you all for your reviews and valuable suggestions!

Li M, Kinematic Design and Property Programmability of Multifunctional Tubular Origami Metamaterials, 2026, 6. [PDF]