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A Coupled Experiment-finite Element Modeling Methodology for Assessing High Strain Rate Mechanical Response of Soft Biomaterials

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Additive Manufacturing for Bioinspired Structures: Experimental Study to Improve the Multimaterial Adhesion Between

Gianni Stano^1,2,3, S M Al Islam Ovy², Gianluca Percoco^1,3

¹Department of Mechanics, Mathematics and Management, Polytechnic University of Bari, Bari, Italy.

3D Printing and Additive Manufacturing

|October 27, 2023

Summary

Researchers optimized 3D printing of bioinspired structures by enhancing stiff-soft material adhesion. The gyroid infill and interface geometry improvements led to superior mechanical properties for soft robotics applications.

Keywords:

actuators additive manufacturing bioinspired structures multimaterial printing soft robotics

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Area of Science:

Bioinspired structures
Soft robotics
Additive manufacturing

Background:

Mimicking nature's structural development is key for advancing soft robotics.
Stiff-soft structures, like bones and cartilage, offer significant advantages.
Material extrusion (MEX) additive manufacturing is explored for creating these structures.

Purpose of the Study:

To investigate the use of MEX additive manufacturing for creating stiff-soft bioinspired structures activated by shape memory alloy (SMA) actuators.
To optimize the interface adhesion between stiff and soft materials using MEX technology.
To evaluate the impact of infill patterns and interface parameters on mechanical properties.

Main Methods:

Investigated three commercial stiff composite plastics with different 3D printing infills (gyroid vs. lines).
Experimentally studied interface geometry, mesh overlapping, and annealing post-treatment to improve stiff-soft material adhesion.
Utilized MEX additive manufacturing to fabricate and test the optimized structures.

Main Results:

The gyroid infill demonstrated superior Young's modulus and ultimate tensile strength (UTS) compared to the lines infill.
Optimized interface parameters achieved a Young's modulus of 48.8 MPa and UTS of 3.8 MPa for nylon+glass fiber and thermoplastic polyurethane.
The achieved UTS was 48% higher than previously reported values for similar material combinations.

Conclusions:

MEX additive manufacturing, with optimized interface parameters, significantly enhances stiff-soft material adhesion for bioinspired structures.
The gyroid infill pattern positively influences the mechanical properties of stiff components.
The developed approach shows great potential for fabricating advanced bioinspired robotic systems, demonstrated by a functional robotic finger prototype.