Digital Fabrication of Graded Hierarchical Material Structures
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Solution Overview
Problem
Current methods for fabricating hierarchical, multi-material structures are not scalable for large areas or digital fabrication, and existing technologies fail to achieve the full potential of architected materials by not being able to build multiscale structures or heterogeneous material structures effectively.
Innovation Solution
A microfluidic print head and robotic deposition system that includes a reservoir of material with fibers, a mixer for generating a mixed flow, a flow focusing section to align fibers, and an actuator to control the orientation of the print head relative to the substrate, allowing for the deposition of hierarchical graded materials with precise control over fiber alignment and composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional semiconductor processes and multiple deposition steps are used to fabricate hierarchical multi-material structures, then material properties such as stiffness and damping can be controlled, but the method is not scalable to large areas or digital fabrication
Solution Approach 1:
The fabrication process is segmented into discrete digital printing operations where individual material compositions and fiber orientations can be independently controlled and deposited at different locations, enabling scalable large-area fabrication while maintaining precise material property control through digital addressing of each deposition zone
Solution Approach 2:
The system dynamically changes material composition parameters and fiber orientation parameters during the deposition process, allowing continuous variation of mechanical properties across the fabricated structure while maintaining scalability through programmable parameter control
2Adaptability or versatility
If existing technologies are used, then fabrication processes can be performed, but they fail to achieve the full potential of architected materials by not being able to build multiscale structures or heterogeneous material structures effectively
Solution Approach 1:
The digital printing system dynamically adjusts deposition parameters, material compositions, and fiber orientations in real-time during fabrication, enabling the creation of heterogeneous multi-scale structures with spatially varying properties that adapt to specific design requirements rather than following fixed process constraints
Solution Approach 2:
The system fabricates composite materials with multiple length scales and heterogeneous compositions by digitally controlling the deposition of different material phases and fiber types, achieving effective multiscale structure building through programmed material placement and composition variation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the scalable fabrication of hierarchical graded materials with controlled mechanical properties, achieving high stiffness and damping capabilities, and allowing for the creation of materials with extreme gradients in mechanical properties similar to natural composites.
Implementation Method 1
a flow focusing section arranged to cause short fibers to align inside the print head
Implementation Method 2
an actuator to control the orientation of the print head relative to a substrate to cause longer fibers to align external to the print head
Implementation Method 3
a print head having a mixer to generate a mixed flow of the materials having fibers
Data Source
AI summary
A deposition system has a reservoir of a material to be deposited, the material having fibers, a print head having a mixer to generate a mixed flow of the materials having fibers, a flow focusing section arranged to cause short fibers to align inside the print head, and an outlet of the print head to allow the material to be deposited on a substrate, and a controller to actuate the print head to control an orientation of the print head relative to a substrate to cause longer fibers to align external to the print head. A deposition system includes a reservoir of a material to be deposited, the material having fibers, a print head connected to the reservoir of material by a conduit, the print head having an exit nozzle and an actuator, the actuator to control the orientation of the exit nozzle relative to a substrate.