
Mengyuan Hu
Beihang University,China
Abstract Title:Investigation of functionally graded triply periodic minimal surfaces with graphene-reinforced AlSi1
Biography:
Mengyuan Hu is currently pursuing her doctoral research from School of Biological Science and Medical Engineering, Beihang University. During the doctoral studies, she has published one paper, and another is under review.
Xueqing Wu has completed his PhD and postdoctoral studies from School of Biological Science and Medical Engineering, Beihang University. He has published more than 10 papers in reputed journals.
Baoqing Pei has completed his PhD and postdoctoral studies from School of Biological Science and Medical Engineering, Beihang University. He is the professor at Beihang University. He has published more than 30 papers in reputed journals.
Research Interest:
Porous structures are widely used in aerospace, military and various protection applications, owing to their lightweight, high stiffness, high energy absorption and so on. In recent years, researchers have paid more attention to the triply periodic minimal surfaces (TPMS), regarded as potential impact resistance structures. Graphene is an ideal reinforcing phase material due to the high strength and excellent ductility. However, the research on the effect of graphene, as a reinforcing phase, for the impact resistance of gradient TPMS is relatively limited. In this work, different gradients Diamond and Gyroid structures were designed to employ finite element analysis. The structures were prepared by SLM with optimized parameters, determined by relative density, morphologies, and mechanical properties. The printed structures were performed with the quasi-static compression and dynamic impact experiments. The impact performance was quantified by three critical indicators. Finite element analysis indicated the positive gradient porosity Gyroid structure (PGG) and positive gradient porosity Diamond structure (PGD) possessed superior energy absorption capacity. The samples prepared with optimized parameters of the laser powder of 370W and scanning speed of 1500mm/s exhibited significant characteristics with relative density of 99.6%. The PGG and PGD lattice structures possessed superior impact resistance under both loading conditions, which the mechanical properties were improved by the load transfer, grain refinement, thermal expansion mismatch and Orowan strengthening mechanism of graphene. This study has guiding significance for the design of aerospace lightweight structures and enhancement of impact resistance.