Subvoxel Control of Fiber Orientation via Multidirectional Shearing in 3D Printing

Area of Science:

• Materials Science
• Additive Manufacturing
• Composite Materials

Background:

• Anisotropy, where material properties vary with direction, is common in nature but challenging to replicate with conventional manufacturing.
• Existing 3D printing methods offer limited control over fiber orientation, typically restricted to 2D or bulk reorientation at the voxel level.
• Recreating localized 3D anisotropies found in natural materials remains a significant hurdle.

Purpose of the Study:

• To develop a novel 3D printing technique for achieving subvoxel control of fiber orientation in all three dimensions.
• To enable the digital programming of microstructures within printed strands for precise anisotropy.
• To demonstrate the capability of this technique in creating materials with localized, controllable responses.

Main Methods:

• Utilized a novel 3D printing approach involving multidirectional shearing through nozzle rotation and inclination.
• Implemented a numerical model to drive and control fiber orientation at the subvoxel level.
• Conducted mechanical and thermal tests to validate the programmable anisotropy.

Main Results:

• Successfully demonstrated subvoxel control of fiber orientation in all three dimensions.
• Achieved programmable microstructures with localized and controllable anisotropic responses.
• Validated the technique's effectiveness through experimental mechanical and thermal testing.

Conclusions:

• The developed 3D printing technique overcomes limitations in replicating complex 3D anisotropies.
• This method allows for precise, digital programming of material microstructures.
• Potential applications include advanced wearables, biomedical implants, lightweight composites, and energy storage devices.