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- Title
Measurement of Weld-Induced Deformations in Three-Dimensional Structures Based on Photogrammetry Technique.
- Authors
Chen, B. Q.; Garbatov, Y.; Soares, C. Guedes
- Abstract
This paper presents an approach for measuring weld-induced initial distortions in plated structures, allowing also for the possibility for transferring that information directly to finite element models. Photogrammetry, which employs a three-dimensional measurement technique and central projection imaging as a fundamental mathematical model, has been used to generate the displacement field from sets of digital images of box girders. Three-dimensional deformation models of box girders were obtained before and after a buckling collapse test. A comparison between the photogrammetric result and Smith's initial imperfection classifications has been performed. A new equation to predict the initial imperfections of very-thin-walled structures has been developed. It is demonstrated that the output of the photogrammetry analysis can be used as a direct input to a finite element model of the deformed structure. The procedure was validated against direct measurements of the deflections, and statistical analyses of the error between measurements and photogrammetric evaluations are presented.
- Subjects
DEFORMATIONS (Mechanics); PHOTOGRAMMETRY; FINITE element method; DIGITAL image processing; DISPLACEMENT (Mechanics); STRUCTURAL analysis (Engineering)
- Publication
Journal of Ship Production & Design, 2011, Vol 27, Issue 2, p51
- ISSN
2158-2866
- Publication type
Article