scholarly journals Measuring geometric imperfections of variable–angle filament–wound cylinders with a simple digital image correlation setup

2021 ◽  
pp. 114497
Author(s):  
Saullo G.P. Castro ◽  
José Humberto S. Almeida Jr. ◽  
Luc St-Pierre ◽  
Zhihua Wang
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
Image Correlation ◽  
Geometric Imperfections ◽  
Variable Angle ◽  
Filament Wound

scholarly journals Measuring geometric imperfections of variable-angle filament-wound cylinders with a simple digital image correlation (DIC) set up

2021 ◽  
Author(s):  
Saullo G. P. Castro ◽  
José Humberto S. Almeida ◽  
Luc St-Pierre ◽  
Zhihua Wang
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
Experimental Tests ◽  
Variable Stiffness ◽  
Filament Winding ◽  
Image Correlation ◽  
Geometric Imperfections ◽  
Variable Angle ◽  
Filament Wound ◽  
Set Up

The experimental measurement of geometric imperfections of cylindrical shells is a fundamental step towards achieving representative models that are capable of capturing the imperfection-sensitive behavior of this type of shells and generate predictions that are comparable with experimental tests. The present study proposes an imperfection measurement method that is simple and applicable to both small and large structures, whereby the topographic data measured with one pair of cameras is obtained at six circumferential positions. Practical aspects of using digital image correlation are discussed, such as lighting and focus adjustments, and calibration. State-of-the-art best-fit routines are used to transform the obtained raw imperfection data onto a common coordinate system by means of least-squares optimization steps. Finally, the transformed data is stitched to build the full imperfection patterns that can be readily used in nonlinear finite element analyses. The developed method is demonstrated in the present study by measuring 12 variable-angle filament-wound cylinders, a novel class of variable-stiffness structures developed by our research group that combines a wide tailoring capability coming from the variable stiffness with the efficient manufacturability enabled by the filament winding process.

Split-disk test with 3D Digital Image Correlation strain measurement for filament wound composites

2021 ◽  
Vol 263 ◽  
pp. 113686
Author(s):  
Yinglun Zhao ◽  
Pavel Druzhinin ◽  
Jan Ivens ◽  
Dirk Vandepitte ◽  
Stepan V. Lomov
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
Strain Measurement ◽  
Image Correlation ◽  
3D Digital Image Correlation ◽  
Filament Wound ◽  
Disk Test
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