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Related Experiment Video

Updated: Jun 14, 2025

Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing

Published on: June 28, 2024

Benchmarking Mechanical Properties of 3D Printed Elastomeric Microstructures.

Or Eivgi¹, Clara Vazquez-Martel¹, Jaroslav Lukeš²

¹Institute for Molecular Systems Engineering and Adv. Mater. (IMSEAM), Heidelberg University, Im Neuenheimer Feld 225, 69120, Heidelberg, Germany.

|June 13, 2025

Summary

This summary is machine-generated.

A new microscale nanoindentation protocol accurately characterizes soft 3D printed materials. This method accounts for adhesion forces, preventing overestimation of mechanical properties in elastomeric microstructures.

Keywords:

PDMS additive manufacturing elastomers mechanical properties nanoindentation two‐photon polymerization

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Area of Science:

Materials Science
Mechanical Engineering
Additive Manufacturing

Background:

Characterizing microscale mechanical properties of soft 3D printed materials is challenging due to a lack of standardized methods.
Existing protocols may overestimate properties due to unaddressed adhesion forces.

Purpose of the Study:

To develop and validate a standardized microscale nanoindentation protocol for soft 3D printed materials.
To accurately measure mechanical properties of elastomeric microstructures, considering adhesion effects.

Main Methods:

Utilized a conospherical indenter tip and a modified trapezoidal displacement profile with lift-off segments.
Employed the nano-Johnson-Kendall-Roberts model for data analysis.
Benchmarked against a literature protocol using a Berkovich tip and the Oliver-Pharr model.

Main Results:

The developed protocol demonstrated accurate characterization of polydimethylsiloxane (PDMS)-based inks.
Adhesion forces were found to significantly influence mechanical property measurements, causing up to 80% overestimation in other methods.
Significant differences in results were observed compared to existing state-of-the-art protocols.

Conclusions:

A standardized microscale nanoindentation protocol is crucial for reliable characterization of soft 3D printed materials.
Accurate measurement requires accounting for adhesion forces, as demonstrated by the nano-Johnson-Kendall-Roberts model.
This work enables straightforward and accurate mechanical property assessment in microscale soft 3D printed structures.