Identifying Structure-Property Relationships of Micro-Architectured Porous Scaffolds through 3D Printing and Finite...

Area of Science:

• Biomaterials Engineering
• Mechanical Engineering
• Computational Modeling

Background:

• Porous scaffolds are crucial in tissue engineering and regenerative medicine.
• Understanding the relationship between scaffold micro-architecture and mechanical properties is vital for designing effective implants.
• 3D printing offers precise control over scaffold microstructure, enabling systematic investigation.

Purpose of the Study:

• To investigate the impact of micro-architectural characteristics (wall thickness, number of domains) on the mechanical properties of 3D printed porous scaffolds.
• To integrate experimental testing with finite element analysis (FEA) for comprehensive analysis.
• To explore deformation mechanisms and potential size-dependent material behaviors.

Main Methods:

• Fabrication of porous scaffolds with controlled microstructures using 3D printing.
• Experimental characterization of longitudinal compressive properties.
• Finite Element Analysis (FEA) to simulate mechanical behavior and deformation.
• Application of thin plate buckling theory for failure analysis.

Main Results:

• Decreasing wall thickness induced a transition in failure mechanisms from compression to buckling.
• Increased number of domains correlated with enhanced effective stiffness, confirmed by both experiments and FEA.
• Computational models using single-wall properties overestimated effective modulus for multi-domain scaffolds, suggesting size-dependent material effects.

Conclusions:

• The integration of experimental and computational methods provides fundamental insights into scaffold mechanics.
• Micro-architectural features significantly influence the mechanical response and failure modes of porous scaffolds.
• Observed discrepancies highlight potential size-dependent material properties in 3D printed structures, warranting further investigation.