报 告 人：李冰冰 助理教授
From the very start, we as mechanical engineers are taught to design parts as simply as possible – square and chunky – so the parts can be economically manufactured. This was due to the limit of available manufacturing technology. Today, however, everything has changed with Additive manufacturing (AM). AM is a class of manufacturing processes where material is deposited in a layer-by-layer fashion to fabricate a three-dimensional part directly from a computer-aided design model. It was first demonstrated more than twenty five years ago, but it has transformed significantly from its early days, when the primary market was rapid prototyping. AM processes now can use metals, polymers, ceramics, and composites to manufacture a large range of durable and fully functional products in moderate to large quantities. The presentation will share Dr. Li’s experience of additive manufacturing in undergraduate research, senior design innovation, industrial and applied research, and engineering education project.
Pore size, external shape, and internal complexity of additively manufactured porous titanium scaffolds for bone tissue engineering are three primary determinants of the cell viability and structural strength of the scaffolds. In the aim at finding an optimal design with a combination of the best of all three determinants we designed four scaffolds each with a unique topology (external geometry and internal structure) and varied the pore sizes of each three times. For each topology, we designed scaffolds with pore sizes of 300, 400, and 500 µm adding up to twelve scaffolds in total. All twelve scaffolds were then 3D printed in titanium Ti6Al4V by Concept Laser M2 metal 3D printer. The scaffolds were compression tested to understand the relationship between a scaffold’s pore size and its structural strength. The results of the test revealed that scaffolds with a pore size of 300 µm were structurally strongest and the ones with a pore size of 500 µm were the weakest.