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Micro/Nano-scale Strain Distribution Measurement from Sampling Moiré Fringes

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Published on: May 23, 2017

Three-dimensional microscopic deformation measurements on cellular solids.

¹School of Engineering, University of Basilicata, Potenza, Italy.

Journal of the Mechanical Behavior of Biomedical Materials

|January 17, 2016

Summary

A new single-camera stereo-Digital Image Correlation (DIC) system uses a wedge prism for 3D microstructural deformation analysis. This method provides detailed surface data for cellular solids, crucial for understanding their structure-function relationships.

Keywords:

3D Digital Image Correlation 3D printed honeycomb Cellular materials Luffa sponge Microscopic deformation

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Area of Science:

Materials Science
Experimental Mechanics
Biophysics

Background:

Understanding the structure-function relationship in cellular solids requires micro-scale 3D deformation data.
Macro-scale mechanical testing provides limited insight into the complex microstructural behavior of cellular materials.
Natural and engineered cellular solids exhibit unique mechanical properties due to their intricate micro- and nano-scale architecture.

Purpose of the Study:

To develop a novel experimental protocol for acquiring dense 3D deformation data of microstructures.
To enable high-resolution surface shape and deformation measurements on complex cellular solids.
To address the need for cell-level experimental data in the study of microstructures.

Main Methods:

A single-camera stereo-Digital Image Correlation (DIC) system was designed using a wedge prism and telecentric lens.
A sequential image capturing scheme with an optimization-based mosaicing procedure was employed to cover large surface areas.
Metrological performance and error analysis were conducted to benchmark the system's accuracy.

Main Results:

The proposed DIC system accurately measures 3D surface shape and deformation on microstructures.
Despite a limited measurement volume, the mosaicing technique effectively expands the measurement area.
The system demonstrated micro-resolution 3D measurements on a 3D printed honeycomb and a Luffa sponge under compression.

Conclusions:

The developed single-camera stereo-DIC system offers a viable solution for obtaining detailed 3D deformation data of microstructures.
This technique is valuable for investigating the mechanical behavior and structure-property relationships of cellular solids.
The method has practical applications in analyzing both engineered and natural cellular materials at the micro-scale.