Measuring geometric imperfections of variable–angle filament–wound cylinders with a simple digital image correlation setup
نویسندگان
چکیده
Measuring the geometric imperfections in cylindrical shells is a critical step necessary to create accurate numerical models that can capture imperfection-sensitive behavior of these structures. Modern composite structures, such as variable–angle filament–wound (VAFW) cylinders, have unique imperfection signature still unknown scientific community. This new class variable–stiffness structures developed by our research group combines wide tailoring capabilities with efficient manufacturability enabled filament winding process. The present study proposes novel measurement method simple and applicable both small large topographic data measured only pair cameras. Practical aspects using digital image correlation (DIC) are described discussed detail, lighting, focus adjustment, calibration. State–of–the–art best–fit routines, based on least–squares optimization, used transform raw into common coordinate system. Finally, transformed stitched build full 3D pattern be readily nonlinear finite element analysis. measure 12 VAFW cylinders. mass cylinders validate evaluate variability proposed methodology.
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ژورنال
عنوان ژورنال: Composite Structures
سال: 2021
ISSN: ['0263-8223', '1879-1085']
DOI: https://doi.org/10.1016/j.compstruct.2021.114497