Material Behavior Characterization of Bamboo with Digital Image Correlation

Primary Faculty Mentor’s Name

Shaowen Xu

Proposal Track

Student

Session Format

Poster

Abstract

In this study, deformation behavior of a natural composite – bamboo was characterized with Digital Image Correlation (DIC) technology under three points bending loading condition. The DIC is a state-of-the-arts no-contact full field measuring technology developed in recent year. It could be used to determine the displacement and strain fields of sample surface at any length scale. Utilizing with microscope the deformation and strain distributions were studied, the neutral axis of the bamboo beam was determined during the loading process.

In detail, dot pattern was speckled on the surface of the bamboo sample. The images of the surface were recorded when bamboo samples subjected to three-points bending. The photos were then imported to the VIC-2D DIC software for analysis to determine the deformation and strain fields of the samples, as well as the neutral axis. It is found that 1) the deformation and strain are non-linear on the vertical cross-sections, 2) the neutral axis is not located at the center of the cross-section and does not remain in one location as portrayed in the theoretical predictions, 3) the results indicate the plane assumption and the theory of classic beam learned in class is no-longer valid for this natural composite. In the study, the micro-structures of the bamboo were also studied. The effects of micro-structure of material behavior will be studied and addressed in the future study.

Keywords

Digital image correlation, Bamboo, Micro-structures, Deformation, Natural composites

Award Consideration

1

Location

Concourse/Atrium

Presentation Year

2014

Start Date

11-15-2014 2:55 PM

End Date

11-15-2014 4:10 PM

Publication Type and Release Option

Presentation (Open Access)

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Nov 15th, 2:55 PM Nov 15th, 4:10 PM

Material Behavior Characterization of Bamboo with Digital Image Correlation

Concourse/Atrium

In this study, deformation behavior of a natural composite – bamboo was characterized with Digital Image Correlation (DIC) technology under three points bending loading condition. The DIC is a state-of-the-arts no-contact full field measuring technology developed in recent year. It could be used to determine the displacement and strain fields of sample surface at any length scale. Utilizing with microscope the deformation and strain distributions were studied, the neutral axis of the bamboo beam was determined during the loading process.

In detail, dot pattern was speckled on the surface of the bamboo sample. The images of the surface were recorded when bamboo samples subjected to three-points bending. The photos were then imported to the VIC-2D DIC software for analysis to determine the deformation and strain fields of the samples, as well as the neutral axis. It is found that 1) the deformation and strain are non-linear on the vertical cross-sections, 2) the neutral axis is not located at the center of the cross-section and does not remain in one location as portrayed in the theoretical predictions, 3) the results indicate the plane assumption and the theory of classic beam learned in class is no-longer valid for this natural composite. In the study, the micro-structures of the bamboo were also studied. The effects of micro-structure of material behavior will be studied and addressed in the future study.