3D printing/biomimetic composites
Currently, our lab is exploring the application of a stiffness gradient in a porous structure through compressive mechanical testing, computerized tomography (CT) imaging, and finite element modeling (FEM). To highlight the use of mechanical gradients in compressive load-bearing applications utilizing biomimicry of IVDs, the general geometry of a porous IVD scaffold was utilized. The gradient is compared to several other material designs (homogeneous, two-step, and reverse gradients) to investigate the importance of a smooth material change and increased radial stiffness. All groups are compressed to 50% strain and the elastic modulus, toughness at 50% strain, height change, and overall fracture is measured. Thus far, the results indicate that a mechanical gradient with increased radial stiffness allows for balance of the mechanical integrity required to withstand compressive loads and favorable recovery characteristics, crucial for long-lasting performance. Furthermore, the structures with an increased radial stiffness out-perform those with a decreased radial stiffness in all aspects.
This study highlights the added benefits of using a material gradient with increased stiffness under compressive loading that can be applied to a wide range of applications. Furthermore, gradients provide additional design parameters for fine-tuning of mechanical properties through material selection, gradient structure, and geometric optimization.

Finite element models and CT scans of the scaffolds
If you are interested in the most recent 3D printing/biomimetic composite research updates, please feel free to contact Melissa Abed (melissaabed at berkeley dot edu) or Erin Archibeck (erinarchibeck at berkeley dot edu).