Three-dimensional microscopic deformation measurements on cellular solids
Journal of the Mechanical Behavior of Biomedical Materials, ISSN: 1751-6161, Vol: 60, Page: 78-92
2016
- 14Citations
- 43Captures
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Article Description
The increasing interest in small-scale problems demands novel experimental protocols providing dense sets of 3D deformation data of complex shaped microstructures. Obtaining such information is particularly significant for the study of natural and engineered cellular solids for which experimental data collected at macro scale and describing the global mechanical response provide only limited information on their function/structure relationship. Cellular solids, in fact, due their superior mechanical performances to a unique arrangement of the bulk material properties (i.e. anisotropy and heterogeneity) and cell structural features (i.e. pores shape, size and distribution) at the micro- and nano-scales. To address the need for full-field experimental data down to the cell level, this paper proposes a single-camera stereo-Digital Image Correlation (DIC) system that makes use of a wedge prism in series to a telecentric lens for performing surface shape and deformation measurements on microstructures in three dimensions. Although the system possesses a limited measurement volume (FOV~ 2.8×4.3mm2, error-free DOF ~ 1mm ), large surface areas of cellular samples can be accurately covered by employing a sequential image capturing scheme followed by an optimization-based mosaicing procedure. The basic principles of the proposed method together with the results of the benchmarking of its metrological performances and error analysis are here reported and discussed in detail. Finally, the potential utility of this method is illustrated with micro-resolution three-dimensional measurements on a 3D printed honeycomb and on a block sample of a Luffa sponge under compression.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S1751616115005172; http://dx.doi.org/10.1016/j.jmbbm.2015.12.043; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84954486819&origin=inward; http://www.ncbi.nlm.nih.gov/pubmed/26773653; https://linkinghub.elsevier.com/retrieve/pii/S1751616115005172; https://dx.doi.org/10.1016/j.jmbbm.2015.12.043
Elsevier BV
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